CN2528027Y - Digital radioactive display using Geiger-Miller counter tube - Google Patents

Abstract

The utility model relates to a digital radioactive display adopting mile counting tube, belonging to a digital radioactive inspection instrument, which comprises an AC conversion rectification filter circuit 1, a DC voltage-regulating circuit 2, a high voltage generation circuit 3, a GM counting tube 4, a pulse shaping circuit 5, an audio amplifying circuit 6, a digital driving circuit 7, a digital displaying circuit 8 and a time-order circuit 9. The radioactive display can inspect radioactive threshold range of architecture materials, thereby providing necessary means for manufacturing and selling architecture materials by user and also preventing the radioactive pollution of architecture materials so as to protect personal health.

Description

Adopt the digital radioactivity display of Geiger-Muller counter tube

Technical field

The digital radioactivity display of employing Geiger-Mueller tube of the present utility model belongs to digital radiac.

Background technology

Domestic existing radiac mostly is field Specialty Design, manufacturings such as mine locating, chemical defence.Basic iodate crystal and the photomultiplier of adopting is that main the detection transmitted, thereby cost is higher, price is all about ten thousand yuan, and require the operator to possess higher educational level and professional knowledge, be difficult to be used, so that the radioactivity building materials that exceed standard are often bought misuse by mistake by general personnel, cause environmental pollution, the infringement health.

The utility model content

Task of the present utility model is to provide a kind of employing Geiger-Mueller tube (hereinafter to be referred as the GM counter tube) to be the main digital radioactivity display that transmits of surveying, thereby it is little to reach machine volume, highly sensitive, detection piece speed, data are intuitively readable, and the horizontal schooling in middle school also can be operated, and is easy to carry, easy to operate, be easy to the digital radioactivity display of safeguarding, promoting.For realizing above-mentioned task, the technical solution of the utility model is connected in GM counter tube and pulse shaping circuit respectively after being connected in circuit for producing high voltage by the exchange conversion current rectifying and wave filtering circuit by direct current regulation circuit, pulse shaping circuit is connected in audio amplifier circuit and digital drive circuit again respectively, and the digital drive circuit links to each other with sequential circuit with digital display circuit respectively again.

The utility model adopts the GM counter tube, with the most succinct method, detects the radioactivity domain value range of building materials, produces and sells the user for vast building materials indispensable detection means is provided, protection people's physical and mental health.It is little to the utlity model has volume, only is equivalent to the volume of domestic existing radioassay instrument 1/3～1/2, is easy to carry; Highly sensitive, detect rapidly, probe is placed the measured object surface, can in a few minutes, finish and detect and directly read the actual measurement thresholding, easy to operate; If adopting radioactivity is the lithotome or the alternative radioactive source of artificial marble work of category-B or C class, assist in aluminium sheet, aluminium skin etc., can make the radioactivity lecture experiment of physics teaching in secondary school.When no suitable radioactive source, also available colour TV, colour display screen video screen are finished experiment as alternate source.Therefore, the utility model both can be suitable for measuring the radioactivity piece speed detection of building materials, also can be used for the radioactivity lecture experiment of physics teaching in secondary school.

Description of drawings

Fig. 1 is the composition frame chart that adopts the digital radioactivity display of Geiger-Mueller tube.

Fig. 2 is the embodiment circuit diagram that adopts the digital radioactivity display of Geiger-Mueller tube.

Label title among Fig. 1: 1, exchange conversion current rectifying and wave filtering circuit, 2, direct current regulation circuit, 3, circuit for producing high voltage, 4, GM counter tube, 5, pulse shaping circuit, 6, audio amplifier circuit, 7, digital drive circuit, 8, the digital indicator circuit, 9, sequential circuit.

Fig. 2 is the specific embodiment circuit diagram of Fig. 1, the N among Fig. 2 ₁, N ₂, N ₃Be ic circuit, the N among Fig. 2 ₆, N ₈, N ₁₀, N ₁₂Be charactron, N ₅, N ₇, N ₉, N ₁₁Be the charactron drive integrated circult, JD1 is a counter tube.

Embodiment

Narrate embodiment of the present utility model and principle of work according to Fig. 1 and Fig. 2.

Fig. 1 is the composition and the annexation figure of the utility model circuit block diagram, be that exchange conversion current rectifying and wave filtering circuit 1 is connected in circuit for producing high voltage 3 back branch two-way outputs by direct current regulation circuit 2, one the road is connected in GM counter tube 4, another road is connected in pulsing circuit 5, pulse shaping circuit 5 links to each other with digital drive circuit 7 with audio amplifier circuit 6 respectively, and digital drive circuit 7 links to each other with sequential circuit 9 with digital display circuit 8 respectively.Its course of work is, exchange conversion current rectifying and wave filtering circuit 1, AC power is obtained 9～10V DC voltage through transformation rectifying and wave-filtering link, after direct current regulation circuit 2 adopted three terminal regulator to be transformed to stable 5V DC circuit, the adjustable voltage that produces 400～500V through circuit for producing high voltage 3 acted on GM counter tube 4 again.GM counter tube in work is subjected to β, gamma activity is particle excitated, and the GM counter tube is breakdown, forms a pulse, and by dividing two-way output after the count pulse shaping of pulse shaping circuit 5, the one tunnel is defeated by audio amplifier circuit 6, produces the counting sound equipment; The digital drive circuit 7 that is subjected to sequential circuit 9 controls is defeated by on another road, produces digital shows signal, shows the cpm number of times.The Measuring Time of sequential circuit 9 controls is 1 minute, latchs several seconds then to treat user's reading.Last zero clearing enters next circulation.

Fig. 2 is the concrete enforcement circuit diagram of Fig. 1, the N among its figure ₁Ic circuit adopts 7805 integrated packages, is used for the voltage stabilizing and the adjusting of supply voltage.N ₂Ic circuit adopts the MA741 integrated package, is used for shaping pulse.N ₃Ic circuit adopts the NE555 integrated package, is used for sequential circuit.The JD1 counter tube adopts Geiger-Mueller tube, is called for short the GM counter tube.Circuit for producing high voltage is by triode V ₁With transformer T ₂Form, the trigger circuit of pulse shaping circuit are by triode V ₂, V ₃, V ₄Form.Audio amplifier circuit is by triode V ₅, V ₆And sounder B ₁Form.Charactron N ₆, N ₈, N ₁₀, N ₁₂Drive integrated package N by number ₅, N ₇, N ₉, N ₁₁Drive.

Claims (1)

1, a kind of digital radioactivity display that adopts Geiger-Mueller tube, it is characterized in that, exchange conversion current rectifying and wave filtering circuit (1) is connected in Geiger-Mueller tube (4) and pulse shaping circuit (5) respectively after being connected in circuit for producing high voltage (3) by direct current regulation circuit (2) again, pulse shaping circuit (5) links to each other with digital drive circuit (7) with audio amplifier circuit (6) respectively, and digital drive circuit (7) links to each other with sequential circuit (9) with digital display circuit (8) respectively again.

Images