KR20000012825U - Sample support for Mossbauer spectroscopy - Google Patents

Abstract

The present invention is a Mossbauer spectroscopy apparatus used to perform phase analysis of iron compounds in reduced iron ore samples, which are products of the steelmaking process, by using gamma rays emitted from radioactive materials. In addition, the present invention relates to the provision of a sample support apparatus for the Mössbauer spectroscopic analysis apparatus, which is designed to increase the degree of analysis by eliminating the decrease in the gamma ray transmittance caused by the sample holder.

The sample support device of the present invention is composed of a cylindrical outer cylinder 18a and an inner cylinder 18b having a passage through which gamma rays pass through the center, and the sample 5 to be analyzed between the outer cylinder 18a and the inner cylinder 18b. A sample holder 18 to be mounted and supported, a slide 17 provided with a sample holder mounting opening 19 for attaching and detaching the sample holder 18, and the slide 17 can be detached in a vertical direction. And a carrier 17a installed on the mounting base 9 of the Mössbauer spectroscopy apparatus so as to be movable to one side or the other side.

Description

Sample support for Mossbauer spectroscopy

The present invention relates to a sample support apparatus for the Mössbauer spectroscopy apparatus suitable for conducting phase analysis of iron compounds in reduced iron ore samples which are products of iron making process using gamma rays emitted from radioactive materials.

As a method for phase analysis of reduced iron ore powder samples, Mossbauer spectroscopy uses specific energy (14.4 KeV) emitted during the decay of a specific radiation source ( ⁵⁷ Co) to ⁵⁷ Fe, and the iron content to be analyzed is analyzed. The phase analysis is performed by irradiating the sample layer to obtain the intrinsic Mossbauer spectrum for each iron compound state in the sample by using a gamma ray detector for the resonance absorption change of energy of the iron ( ⁵⁷ Fe) component present in the sample layer. At this time, the analytical sample is made into a thin pellet so that the gamma ray can penetrate, and the sample made in the required shape is attached to the sample mounting stand in front of the radiation source outlet to irradiate the gamma ray and absorb the resonance of the gamma ray passing through the sample layer. The energy change is detected by a gamma ray detector and Mossbauer spectroscopy is performed.

In the conventional sample holder for Mossbauer spectroscopy device, the thickness of the holder itself made of acrylic to fix the sample is very thick. Such a thicker holder relatively inhibits the transmission of gamma rays due to the characteristics of Mossbauer spectroscopy. And because it takes a few minutes to assemble or disassemble by screwing it to the holder mount in front of the radiation source outlet, the operator is exposed to gamma rays when the sample is mounted. Is holding. Mossbauer spectroscopy is a device that conducts phase analysis using ⁵⁷ Co as a radiation source, and prolonged exposure of the radiation source can cause fatal damage to the human body. It is very important that the exchange be mounted so that analysis can be performed.

Therefore, the present invention has been studied for the purpose of solving the conventional problems, the present invention provides a sample support device, characterized in that configured to be mounted or separated in front of the gamma ray outlet in a short time the analytical sample. The sample support device of the present invention is different from the conventional sample holder, which is screwed to the radiation source outlet, and moves the slider supporting the sample up and down on the movable carrier installed to adjust the position between the radiation source and the gamma ray detector. It is structured so that it can be mounted or detached within a few seconds. In addition, the sample holder detachably attached to the slider is basically composed of two cylindrical bodies capable of mutual disassembly and assembly so as not to interfere with gamma ray penetration while easily fixing the plate-like analysis sample sheet. The sample holder is mounted between the sample holders at the center of the holder mounting slider, and the sample holder mounting slider is instantaneously mounted on the slide carrier on the Mössbauer spectrometer. Alternatively, the structure is detachable.

1 is a configuration diagram of a Mossbauer spectroscopy apparatus related to the present invention,

Figure 2 is a schematic diagram showing a signal processing system of the Mossbauer spectroscopy apparatus,

3 is a configuration diagram of a Mossbauer spectroscopy apparatus to which the present invention is applied;

Figure 4 is an exploded perspective view of a sample support device according to the present invention.

Explanation of symbols on the main parts of the drawings

1: Mossbauer spectroscopy device, 2: radiation source, 3: source drive device,

4: Conventional sample holder 5: Sample, 6: Gamma detector, 7: Gamma ray

9: Mössbauer Spectrometer Mount 12: Amplification and Single Channel Analyzer

13: Multichannel Analyzer 14: Computer 17: Sample Loading Slide

17a: carrier 17b: slide detachable portion 18: sample holder 18a: outer cylinder

18b: inner cylinder 19: sample holder mounting hole

Hereinafter, the present invention for achieving the above object will be described in more detail with reference to the accompanying drawings.

Figure 1 shows the configuration of the Mossbauer spectroscopy apparatus with a conventional sample mounting holder. The Mossbauer spectroscopy apparatus 1 shown in FIG. 1 includes a Mossbauer source driver 3 for moving a radiation source at an equivalent acceleration, and a gamma ray 7 emitted from a radiation source ⁵⁷ Co 2 mounted at its tip. The sample holder 1 is screwed to the holder mount 4 provided in the case of the source driving device 3 so as to be located forward in the discharge direction, and the gamma ray detector 6 is included. The analytical sample (5) resonates and absorbs 14.4 keV of energy emitted when ⁵⁷ Co, which is a radiation source, decomposes into ⁵⁷ Fe, and is transferred from the ground state to the excited state. Measured by a gamma-ray detector 6 installed at the rear, and then installed on the computer 14 through an amplification and single channel analyzer 12 consisting of a pre-amplifier, a main amplifier and a single channel analyzer. It is transmitted to the multi-channel analyzer 13, the analysis process and the status is displayed on the screen of the computer (14). At this time, the radiation source driving device 3 is driven at an equivalent speed while minimizing the mechanical error according to the signal of the multi-channel analyzer 13 to obtain a Mossbauer energy spectrum representing the intrinsic properties of the iron compound in the sample.

By the way, the existing analytical sample support means is to make a holder (11) in the form of a double basket made of acrylic, put the analytical sample (5) inside the outer basket of the holder and sandwich the inner sample (5) in the acrylic material, After fixing between the outer basket and screwed to the sample mounting table (4) has a structure for mounting the sample. In this case, the holder has a double bucket structure to hold the analytical sample, the thickness of the holder through which the gamma ray must pass is relatively thick, and thus, the thickness of the holder through which the gamma ray should penetrate decreases the transmittance of the gamma ray energy. Get the result. And it takes a very long time to screw disassemble the double bucket-shaped sample holder 11 to the holder mounting bar 4, the time that the operator is exposed to the gamma ray while mounting the sample is relatively The problem is getting longer. Mossbauer spectroscopy is a device that conducts phase analysis using ⁵⁷ Co as a radiation source. Long-term exposure of the radiation source can cause fatal damage to the human body. It is very important to complete the mounting and perform the analysis.

Figure 3, Figure 4 shows the configuration of the sample support apparatus according to the present invention to effectively solve the conventional problems as described above. As shown here, instead of the above-described conventional sample holder, the sample support device of the present invention can be moved toward the source driving device 3 or the gamma ray detector 6 on the associated Mössbauer spectroscopic analyzer mounting table 9. A carrier 17a having a slide detachable portion 17b installed so as to be securely installed, a slide 17 detachably attached to the slide detachable portion 17b of the carrier 17a in a vertical direction, and a sample holder mounting hole of the slide 17. It is configured to include a sample holder 18 that is attached to and detached from (19).

The sample holder 18 is composed of a cylindrical outer cylinder 18a and an inner cylinder 18b which can be assembled and disassembled with each other in a detachable manner, and the inner cylinder 18b is mounted after the sample 5 is mounted inside the outer cylinder 18a. ) Is assembled so as to support the sample 5 by assembling in the embodiment shown inside the outer cylinder 18a. The outer cylinder 18a and the inner cylinder 18b constituting the sample holder 18 have a cylindrical shape and form a passage through which gamma rays pass through the center thereof, thereby causing no decrease in the transmittance of the gamma rays due to the sample holder 18. I never do that.

When the sample 5 needs to be mounted or exchanged, the operator first moves the carrier 17a into place on the mounting table 9 and pulls the slide 17 up from the slide detachable portion 17b on the carrier 17a. The sample holder 18 is separated from the slide 17 removed in this manner, and the sample to be analyzed 5 is mounted between the inner and outer cylinders 18a and 18b of the sample holder 18, and then the slide 17 Insert and mount the sample holder mounting hole 19 of the sample holder, and then slide the completed slide 17 onto the slide detachable portion 17b on the carrier 17a from above and engage the carrier 17a. This can be done by moving to a fixed location on the device 3 side.

Therefore, the present invention can be easily and quickly performed by simply inserting and subtracting the entire work of mounting or exchanging the sample to be analyzed by the configuration and operation as described above. It has the effect of minimizing the efficiency of the sample, and also provides the advantage of further improving the degree of analysis because there is no decrease in gamma transmittance due to the sample holder.

Claims (1)

A sample holder 18, which is composed of a cylindrical outer cylinder 18a and an inner cylinder 18b formed with a passage through which gamma rays pass through, and supports the sample 5 to be analyzed between the outer cylinder 18a and the inner cylinder 18b. ), A slide 17 provided with a sample holder mounting opening 19 for attaching and detaching the sample holder 18, and a slide detachable portion 17b for attaching and detaching the slide 17 in the vertical direction. And a carrier (17a) installed on the mounting base (9) of the Mossbauer spectroscopy apparatus so as to be movable to one side or the other side thereof.