KR101632907B1 - A multi changer for calibration of radiation dose rate survey meter - Google Patents

Abstract

The present invention relates to a multi-changer for a radiation dose rate meter for calibration of a radiation dose rate meter, and it is an object of the present invention to provide a multi-changer for a radiation dose rate meter which can load a plurality of calibration dosimetry instruments at once, So that the calibration work time can be remarkably shortened to improve the efficiency of the calibration work and the worker's calibration room can be minimized to minimize the occurrence of safety accidents. A tray to be conveyed; A rectangular parallelepiped shape having a hollow inside and each having a guide groove, a tray feeding mouth, a feeding feeding pupil, a tray stool bulb, an opening and closing door, A tray loading tower; The tray trays of the two tray loading towers are connected horizontally and the trays discharged through the tray trays of the one tray loading tower are connected to the tray feeding ports of the other tray loading tower A tray horizontally moving the tray to perform a radiation dose rate correction by arranging the tray on the middle portion while conveying; The trays mounted on the top of the two tray loading towers are sequentially lifted up in the tray loading tray or the trays loaded horizontally into the hollow tray through the tray loading tray are sequentially loaded A tray lifting / guiding device for lifting the tray; A tray installed on the upper side of the two tray loading towers to discharge the tray lifted on the uppermost tooth in the tray loading tray through the tray tray so as to transport the tray horizontally to the correcting position along the feeding tray, A tray transfer device for transferring the tray to a tray transfer port of the other tray loading tower; A first tray sensing means for receiving the sensing signal when the tray is mounted at the calibration position of the feeding bar and the tray is conveyed to the calibration position along the feeding bar when the tray reaches the calibration position; Second tray sensing means mounted on the inner ceiling of the two tray loading towers to sense that the loaded tray reaches the top position in the tray loading tower and transmit the sensing signal; Third tray sensing means mounted on an inner bottom surface of the two tray loading towers to sense that the loaded tray has reached the lowest position in the tray loading tower and transmit the sensing signal; Fourth tray sensing means mounted on the inner upper portion of the two tray loading towers to detect that the tray is fully loaded into the tray loading tray through the tray loading and transmit the detection signal; Wherein the control unit is electrically connected to the first to fourth tray sensing means, the tray elevation driving device, the tray transporting device, and the calibration actual fisher unit, And a control unit for controlling the operation of the tray elevation drive device and the tray transfer device.

Description

[0001] The present invention relates to a multi-changer for calibration of a radiation dose rate meter,

The present invention relates to a multi-changer for a radiation dose rate meter for calibration of a radiation dose rate meter, and more particularly, to a multi-changer for a radiation dose rate meter which comprises a plurality of radiation dose rate meters to be calibrated when performing a radiation dose rate calibration for a radiation dose rate meter, The present invention relates to a multi-changer for measuring a radiation dose rate meter for calibration of a radiation dose rate meter, which has a structure capable of improving the productivity of the calibration work by minimizing the radiation dose to the worker by making it possible to sequentially calibrate the measuring instrument .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram schematically illustrating the structure and use state of a calibration room for performing radiation dose rate calibration for a conventional radiation dose rate meter. FIG.

1, generally, in performing the radiation dose rate calibration on the radiation dose rate meter, one radiation dose rate meter F is mounted on a calibration table E provided so as to be movable along the rail D The radiation dose rate is calibrated to the radiation dose rate meter F while the calibration table E is moved along the rail D to a predetermined position of at least three points after the calibration is completed, The dose rate measuring instrument F is removed on the calibration table E and then another radiation dose rate measuring instrument F to be calibrated is mounted on the calibration table E to repeat the calibration operation. Here, 'A' denotes a calibration room, 'B' denotes a source (radiation source), and 'C' denotes a collimator.

However, in the conventional radiation dose rate calibration method for the above-mentioned conventional radiation dose rate measuring apparatus, in order to repeat the calibration work by repeatedly mounting the calibration target radiation dose rate measuring instrument on the calibration table one by one, every time the radiation dose rate measuring instrument is replaced, There is a possibility of a safety accident because it has to go into the calibration room, and there is a possibility that a safety accident occurs, and the replacement time required when the radiation dose rate meter is replaced with the next radiation dose rate meter after the calibration work of the measuring instrument is completed, Therefore, there is a problem in that it is difficult to obtain a consistent correction value because the location of the radiation dose rate meter is changed every time on the calibration table.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a radiographic apparatus and a radiographic apparatus which can load a plurality of calibrating radiation dose rate meters at one time and sequentially perform correcting operations for each loaded radiation dose rate measurer The present invention provides a radiation dose rate meter multi-changer for calibration of a radiation dose rate meter which can reduce the time for correcting work by improving the efficiency of the calibration work and minimizing the worker's access to the calibration room.

The above object of the present invention can be achieved by a radiotherapy apparatus comprising: a tray to which a radiation dose rate meter is detachably mounted; A guide groove formed in a square pillar shape having a hollow inside thereof and penetratingly formed along the longitudinal direction of both side end portions of the opposite side portions; a tray guide member formed to penetrate the upper end side of one side surface portion; And a tray opening and closing door for opening and closing the tray entrance bulb. The tray opening and closing door is formed in a plate shape and protrudes outwardly at each corner portion, Two tray loading towers each having a guide member integrally assembled so as to be slidably engaged with the groove and having a lift-up plate for lifting and lowering the tray along the inner hollow and being parallel and opposed to and fixed on the calibration table; The tray trays of the two tray loading towers are connected horizontally and the trays discharged through the tray trays of the one tray loading tower are connected to the tray feeding ports of the other tray loading tower A tray horizontally moving the tray to perform a radiation dose rate correction by arranging the tray on the middle portion while conveying; The trays mounted on the top of the two tray loading towers are sequentially lifted up in the tray loading tray or the trays loaded horizontally into the hollow tray through the tray loading tray are sequentially loaded A tray lifting / guiding device for lifting the tray; A tray installed on the upper side of the two tray loading towers to discharge the tray lifted on the uppermost tooth in the tray loading tray through the tray tray so as to transport the tray horizontally to the correcting position along the feeding tray, A tray transfer device for transferring the tray to a tray transfer port of the other tray loading tower; A first tray sensing means for receiving the sensing signal when the tray is mounted at the calibration position of the feeding bar and the tray is conveyed to the calibration position along the feeding bar when the tray reaches the calibration position; Second tray sensing means mounted on the inner ceiling of the two tray loading towers to sense that the loaded tray reaches the top position in the tray loading tower and transmit the sensing signal; Third tray sensing means mounted on an inner bottom surface of the two tray loading towers to sense that the loaded tray has reached the lowest position in the tray loading tower and transmit the sensing signal; Fourth tray sensing means mounted on the inner upper portion of the two tray loading towers to detect that the tray is fully loaded into the tray loading tray through the tray loading and transmit the detection signal; Wherein the control unit is electrically connected to the first to fourth tray sensing means, the tray elevation driving device, the tray transporting device, and the calibration actual fisher unit, And a control unit for controlling operations of the tray elevation driving device and the tray conveying device. The radiation dose rate meter for the calibration of the radiation dose rate meter may be achieved by the multi-changer.

The radiation dose rate meter multi-changer for calibration of the radiation dose rate measuring instrument according to the present invention allows a plurality of radiation dose rate measuring instruments requiring the calibration of the radiation dose rate to be loaded at once and to sequentially perform the radiation dose rate calibration according to the loaded order, It is possible to minimize the access to the calibration room, minimize the occurrence rate of safety accidents, minimize the radiation dose to the worker, and continuously calibrate the radiation dose rate meter, thereby significantly improving the calibration work time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram schematically illustrating a structure and a use state of a calibration room for performing a radiation dose rate calibration for a conventional radiation dose rate meter,
FIG. 2 is an installation view showing a state where a radiation dose rate meter multi-changer for calibration of a radiation dose rate meter according to the present invention is installed on a calibration table in a calibration room,
FIG. 3 is a front view showing a tray loading tower of a multi-changer for radiation dose rate measurement for calibration of a radiation dose rate meter according to the present invention shown in FIG. 2,
FIG. 4 is a plan view of an operation state of the multi-changer of the radiation dose rate meter for calibration of the radiation dose rate meter according to the present invention,
FIG. 5 is a partially enlarged cross-sectional view showing an upper part of a tray loading tower among the multi-changer for radiation dose rate measurement for calibration of a radiation dose rate meter according to the present invention,
FIG. 6 is a schematic view of a configuration of a tray lifting / driving apparatus for a radiation dose rate meter multi-changer for calibration of a radiation dose rate meter according to the present invention,
FIG. 7 is a cross-sectional view illustrating a radiation dose rate meter for multi-changer tray transfer apparatus for calibration of a radiation dose rate meter according to the present invention,
FIG. 8 is a block diagram illustrating mutual organic relationships between components and components, which are electrically connected to a control unit and controlled in operation, of a radiation dose rate meter for calibrating a radiation dose rate meter according to the present invention,
FIG. 9 is a cross-sectional view of a cross-sectional view of a radiation dose rate meter multi-changer tray for calibration of a radiation dose rate meter according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

2 to 5 and 9, a radiation dose rate meter multi-changer 10 (hereinafter, referred to as a 'radiation dose rate meter multi-changer') for calibrating a radiation dose rate meter according to the present invention comprises a tray 20, Two tray loading towers 30 and 40, a tray horizontal transferring tray 50, a tray elevating and moving driving devices 60 and 60 ', a tray conveying device 70 and 70' To-fourth-tray detecting means 80, 81, 82, and 83, and a control unit 90.

The tray 20 is detachably mounted on a tray 30 to be calibrated and is transported to a calibration position on the carriage 50 after the tray is loaded in one side of the tray loading tower 30 When the calibration is completed, the housing 21, the two grip blocks 23 and 24, the elastic means 25 (26 (26), and 26 ).

Referring to FIGS. 2 and 9, the housing 21 has a box-like shape having a hollow therein, and has an instrument receiving portion 22 having an upper surface and an intermediate portion between the upper and lower surfaces thereof cut out.

The two grip blocks 23 and 24 are blocks of a hexahedron and are opposed to both inside sides of the housing 21.

The elastic means 25 and 26 are compression springs which are respectively embedded between the gripping blocks 23 and 24 and the inner end face of the housing 21 so that the gripping blocks 23 and 24 are housed in the housing 21 Elastic support to the middle part,

The radiation dose rate meter F is disposed in the space between the gripping blocks 23 and 24 of the tray 20 in the direction opposite to each other and when the opened gripping blocks 23 and 24 are placed, The radiation dose rate measuring device F can be easily fixed in the tray 20 because the grip blocks 23 and 24 are tightened to the middle portion of the housing 21 by the elastic force of the elastic members 25 and 26. [

2 to 5, the two tray loading bases 30 and 40 have a rectangular column shape with a hollow inside and include guide grooves 31 and 41, trays 32 and 42, And the conveying bar mounting holes 33 and 43, the tray elongated holes 34 and 44, the opening and closing doors 35 and 45 and the ascending and descending plates 36 and 46, Parallel and opposed to each other.

The guide grooves 31 and 41 are formed so as to penetrate along the lengthwise direction of the both side ends of the opposite side portions of the tray loading bases 30 and 40.

The tray openings 32 and 42 are respectively formed on the side of the upper end side of the opposed one side of each of the tray loading bases 30 and 40.

The feed bar mounting holes 33 and 43 are formed on the side of the upper end of the other side opposite to the tray openings 32 and 42 of the tray loading bases 30 and 40, respectively.

The tray elongated bulbs 34 and 44 are formed through side surfaces opposed to the side portions of the tray loading bases 30 and 40 where the tray openings 32 and 42 are formed.

The opening and closing doors 35 and 45 are respectively mounted on the tray lamps 34 and 44 of the tray loading and unloading bases 30 and 40 to open and close the tray lamps 34 and 44.

The up-and-down steel plates 36 and 46 are plate-shaped, and guide pieces 36a and 46a protruding outward from the respective corner portions and assembled to the guide grooves 31 and 41, respectively, And moves up and down the tray 20 along the inner hollow of the tray loading towers 30 and 40.

2, 4 and 5, the tray horizontal horizontal movement unit 50 has guide pieces 51 bent upward at both ends thereof, and the two tray loading bases 30 and 40 The trays 32 and 42 are horizontally connected and the tray 20 discharged through the tray inlets of the one tray loading tower is transported to the tray transporting port of the other tray loading tower and the tray 20 is transported And the radiation dose rate correction is carried out.

Referring to FIGS. 2, 3, 6 and 8, the tray lifting and driving apparatuses 60 and 60 'are respectively mounted on the upper surfaces of the two tray loading towers 30 and 40, (30) (40) through the trays (32) and (42) conveyed along the conveying platform (50) 62, 62 ', the driving means 63, 63', and the lifting wire 64 (63 '), which sequentially load the tray 20, ) 64 ', 65 and 65'.

The two wire shafts 61, 61 ', 62 and 62' have wire rolls 61a, 61a ', 62a and 62a' at their both ends and worm wheels 61b and 61b ' ) 62b and 62b ', which are rotatably mounted on opposite ends of the top surface of the tray loading tower 30 (40), respectively.

The driving means 63 and 63 'are motors having rotating shafts 63a and 63a' that penetrate the central portions of both ends and are connected to both ends of the rotating shafts 63a and 63a ' (Worm 63b) 63b 'meshed with the worm wheel 61b (61b'), 62b (62b ') of the tray loading tower (30) And is electrically connected to the controller 90.

The lift wires 64, 64 ', 65 and 65' are connected to the wire rolls 61a, 61a 'and 62a of the two wire shafts 61, 61', 62 and 62 ' 62, 62 ', and the ends thereof are fixed to the guide pieces 36a, 46a of the up / down steel plates 36, 46, respectively, so that the wire shafts 61, 61' Descending the steel plates 36 and 46 in accordance with the normal /

2 to 5, 7 and 8, the tray transfer devices 70 and 70 'are respectively installed on the upper side of the two tray loading towers 30 and 40, 30) 40 is discharged through the tray openings 32, 42 to transport the tray horizontally to the calibrating position along the conveying belt 50, and the calibrated tray The screw fixing block 71 and 71 ', the conveying screws 72 and 72', the screw driving worm 73 (73 '), and the screw fixing block 71' ', And driving means 74 and 74'.

The screw fixing blocks 71 and 71 'are provided with screw operation holes 71a and 71a' formed to penetrate and worm operating grooves 71b formed by cutting the screw operation holes 71a and 71a ' And is fixed to the transfer bar mounting holes 33 and 43 of the tray loading / unloading columns 30 and 40.

The conveying screws 72 and 72 'are round bars having threaded portions formed along the outer circumferential surface thereof. The conveying screws 72 and 72' have trapezoids 72a and 72a 'at one end thereof and are screwed into the screw operation holes of the screw fixing blocks 71 and 71' 71a (71a ').

The screw driving worms 73 and 73 'are assembled to the outer peripheral surfaces of the conveying screws 72 and 72' so that the worm operating grooves 71b and 71b 'of the screw fixing blocks 71 and 71' As shown in Fig.

The drive means 74 and 74 'have gears 74b and 74b' that engage with the external gears of the screw drive worms 73 and 73 'on the rotary shafts 74a and 74a' And is electrically connected to the control unit 90 to feed the feed screws 72 and 72 'in the longitudinal direction.

4, the first tray sensing means 80 is mounted at a predetermined position of the tray 50 so that the tray horizontal is mounted at the calibration position of the tray 50, To the calibration position when the tray 20 reaches the calibration position.

5, the second tray sensing means 81 is mounted on the upper inner side of the two tray loading towers 30 and 40 and the loaded tray 20 is mounted on the tray loading tray 30 ), And transmits the detection signal.

3, the third tray sensing means 82 is mounted on the inner bottom surface of the two tray loading bases 30 and 40 and the loaded tray 20 is mounted on the tray loading bases 30 ), And transmits the detection signal.

4, the fourth tray sensing means 83 is installed in the upper portion of the inside of the two tray loading bases 30 and 40 to receive the tray loading tower 30 through the tray receiving holes 32 and 42, Detects that the tray (20) flowing into the tray (40) is fully loaded, and transmits the detection signal.

8, the controller 90 controls the first to fourth tray sensing means 80, 81, 82, 83, tray elevation driving apparatus 60, 60 ' 70, 70 'and the calibration realistic part 100 so as to be received from the calibration realistic part 100 and the first to fourth tray sensing means 80, 81, 82, 83 And controls the operation of the tray lifting / driving apparatus 60 (60 ') and the tray transfer apparatus 70 (70') based on the detection signal.

The radiation dose rate meter multi-changer 10 according to the present invention having the above-described structure is characterized in that a plurality of radiation dose rate meters F are mounted in a plurality of trays 20, respectively, The doors 20 and 35 are sequentially loaded into the inner hollow through one of the tray lamps 34 and 44 of the tray loading towers 30 and 40 and the opening and closing doors 35 and 45 are closed.

When the loading of the tray 20 is completed, a sensing signal is received from the first to fourth tray sensing means 80, 81, 82, and 83 by the control unit 90, The controller 90 drives the tray elevator driving apparatuses 60 and 60 'and the tray conveying apparatuses 70 and 70' of the tray loading tower loaded with the tray 20 according to a program loaded on the basis of the received detection signal. Each of the means 63, 63 ', 74 and 74' is individually operated to sequentially transfer the tray 20 to the calibration position in accordance with the loaded order, and then the radiation dose rate correction is performed. (20) is transferred to the opposite tray loading tower for repeatedly loading the radiation dose rate measurement instrument (F), so that it is possible to prevent the operator from going into the calibration room (A) Dose rate correction can be performed quickly and safely.

10: Radiation dose rate meter Multi-changer 20: Tray
21: housing 23, 24: gripping block
25, 26: elastic members 30, 40: tray loading tower
31, 41: guide groove 32, 42:
33, 43: Feeding rod mounting hole 34, 44: Tray length light bulb
35, 45: opening / closing door 36, 46:
36a, 46a, 51: guide piece 50: tray horizontal feeder
60, 60: tray elevation drive device 61, 61 ', 62, 62'
61a, 61a ', 62a, 62a': wire rolls 61b, 61b ', 62b, 62b'
63, 63 ': Driving means 63a, 63a'
63b, 63b ': worms 64, 64', 65, 65 '
70, 70 ': Tray transfer device 71, 71': Screw fixing block
71a, 71a ': screw operating ball 71b, 71b': worm operating groove
72, 72 ': Feed screw 72a, 72a': Trays
73, 73 ': screw driving worm 74, 74': driving means
74a, 74a ': rotation shaft 74b, 74b': gear
80: first tray sensing means 81: second tray sensing means
82: third tray sensing means 83: fourth tray sensing means
90: Control unit 100: Calibration real fisher
110: Calibration table

Claims (4)

A tray 20 to which the radiation dose rate meter is removably mounted; (31) and (41) formed in a square pillar shape having a hollow inside and having a pair of guide grooves (31) and (41) penetratingly formed along the longitudinal direction of both side ends of the opposite side portions, 33 and 43 which are formed to pass through the side portions opposed to the tray openings 32 and 42 and a side wall portion opposed to the side portions where the tray openings 32 and 42 are formed, A tray opening and closing door 35 and 45 for opening and closing the tray entrance bulb 34 and 44 and a door opening and closing door 35 formed in a plate shape and protruding outwardly from the respective corner portions, Down plates 36 and 46 which integrally have guide pieces 36a and 46a assembled to be slidable with respect to the tray 20 and raise and lower the tray 20 along the inner hollow, Two tray loading bases (30) (40) fixed parallel and opposed to each other on the conveying path; The tray trays 32 and 42 of the two tray loading towers 30 and 40 are horizontally connected to each other and the guide trays 51 of the tray trays of the one- (50) for transferring the tray (20) discharged through the tray to a tray transfer port of the other tray loading tower and arranging the tray (20) on the middle section to perform radiation dose rate calibration; The trays 30 and 40 are mounted on the top of the two tray loading towers 30 and 40 so as to sequentially raise the trays loaded in the tray loading towers 30 and 40, (60 ') for sequentially loading a tray (20) which is introduced into the hollow interior of the tray loading towers (30) (40) through the tray trays (32) and (42) The trays 20 are installed on the upper side of the two tray loading towers 30 and 40 to discharge the tray 20 lifted on the uppermost tooth in the tray loading towers 30 and 40 through the tray trays 32 and 42 (70), 70 '(70') for feeding the tray 20 horizontally to the calibrated position along the tray 50 and feeding the calibrated tray 20 on the calibrated position to the tray feeder of the other tray loading tower. Wow; A first tray sensing means for transmitting the sensing signal when the tray 20 is mounted at the calibration position of the tray 50 and the tray 20 is transported to the calibration position along the tray 50, (80); It is detected that the loaded tray 20 mounted on the upper inside of the two tray loading towers 30 and 40 has reached the uppermost position in the tray loading towers 30 and 40 and transmits the detection signal A second tray sensing means 81; It is mounted on the inner bottom surface of the two tray loading towers 30 and 40 to detect that the loaded tray 20 has reached the lowest position in the tray loading towers 30 and 40, A third tray sensing means 82; It is detected that the tray 20 mounted on the inner upper portion of the two tray loading towers 30 and 40 and fully loaded into the tray loading towers 30 and 40 through the tray throwing ports 32 and 42 is fully loaded A fourth tray sensing means (83) for transmitting the sensing signal; The first to fourth tray sensing means 80, 81, 82 and 83, the tray elevation driving devices 60 and 60 ', the tray transporting devices 70 and 70' The tray elevation drive apparatus 60 is electrically connected to the tray lifting and driving apparatus 60 based on a sensing signal received from the calibration actual fisherman 100 and the first to fourth tray sensing means 80, 81, 82, And a control unit (90) for controlling the operation of the tray transfer device (70 ') and the tray transfer device (70', 70 '), comprising:
The tray elevation driving devices 60 and 60 '
62a ', 62a', 62a ', and worm wheels 61b, 61b', 62b, 62b ', respectively, at both ends of the tray loading tower 30 62 ' and 62 ' that are rotatably mounted on both opposite ends of the upper surface of the frame body 61, respectively;
62b 'of the wire shafts 61, 61', 62, 62 'to the worms 61b, 61b', 62b, 62b 'of the wire shafts 61, 62' 63 ', 63b') fixed on the upper surface of the tray loading tower 30 (40) and electrically connected to the control unit 90;
62a ', 62a, 62a' of the two wire shafts 61, 61 ', 62, 62', respectively, and the ends thereof are wound on the elevated steel plate 36, 46 and 46 are fixed to the guide pieces 36a and 46a of the guide shaft 46 to move up and down the up and down steel plates 36 and 46 in accordance with the normal and reverse rotations of the wire shafts 61, 61 ', 62 and 62' And a lifting wire (64) (64 ') (65) (65'). The radiation dose rate meter multi-changer for calibration of the radiation dose rate meter. delete The method according to claim 1,
The tray transfer devices 70 and 70 '
And has worm operating grooves 71b and 71b 'which are formed at right angles to the screw operating holes 71a and 71a', and the worm operating grooves 71b and 71b ' 30) 40, a screw fixing block 71 (71 ') fixed to the transfer rod mounting holes 33, 43;
(71a, 71a ') of the screw fixing block (71, 71') having a tray rod (72a, 72a ') at one end and having a threaded portion formed along the outer circumferential surface thereof, A conveying screw 72 (72 ');
A screw driving worm 73 (see FIG. 1) rotatably disposed in the worm operating grooves 71b and 71b 'of the screw fixing blocks 71 and 71' while assembled to the outer circumferential surface of the conveying screws 72 and 72 ' ) 73 ';
And has gears 74b and 74b 'that are engaged with the external gears of the screw driving worms 73 and 73' on the rotating shafts 74a and 74a ', and are electrically connected to the controller 90, , And drive means (74, 74 ') for transferring the screws (72, 72') in the longitudinal direction. The method according to claim 1,
The tray (20)
A housing (21) having a box shape having a hollow inside and having an instrument receiving portion (22) having an upper surface and an intermediate portion between front and rear surfaces;
Two gripping blocks (23) (24), which are built in as a block to be opposed to both inner sides of the housing so as to be opposed to each other;
And elastic means 25 and 26 which are respectively embedded between the gripping blocks 23 and 24 and the inner end faces of the housing 21 to elastically support the gripping blocks 23 and 24 to the middle portion of the housing 21 Wherein the radiation dose rate meter is a multi-changer for calibration of a radiation dose rate meter.

Images