Device and method for measuring variation coefficient of whole-body pollution monitor

Abstract

The invention relates to the technical field of ionizing radiation measurement, in particular to a whole body pollution monitor variable coefficient measuring device and method, the device comprises a cross rod, a holder and a holder seat, the cross rod is provided with a plurality of positioning holes, the holder seat is fixed by the cross rod through the positioning holes, the holder seat is provided with the holder, and the holder is used for fixing a radioactive source. The device is fixed through the puller screws, fixation is stable, manual hand holding is not needed, the labor cost is reduced, and the radiation dose borne by workers is reduced; the device is provided with a plurality of fixing holes, the radioactive source can be quickly and accurately fixed at a correct position, the measurement is stable, the data is accurate, the variable coefficient V is finely calculated, the equipment maintenance efficiency of maintenance personnel is improved, the working time of the maintenance personnel is shortened, and the inspection effectiveness of a detector is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring the coefficient of variation of ionizing radiation, and particularly to a device and a method for measuring the coefficient of variation of a whole-body contamination monitor. Background Art

[0002] Whole-body contamination radiation monitoring equipment is mainly applied to the field of radiation monitoring where personnel and the like may have excessive radioactive contamination. Currently used whole-body contamination radiation monitors all adopt large-volume plastic scintillator detectors. Such whole-body contamination radiation monitors need to use radioactive sources to regularly check the detectors, and the coefficient of variation is an important indicator to measure the monitoring stability of the detectors.

[0003] In the prior art, workers mostly use methods such as pasting radioactive sources or holding radioactive sources for measurement. This method cannot perform multiple stable measurements of the source-carrying counting rate. The stability of the placement of the radioactive source and the number of stable measurement times seriously affect the credibility of the measurement of the coefficient of variation of the equipment. The actual inspection effect is not good, and the radiation to personnel is relatively large. Summary of the Invention

[0004] The present invention provides a device and a method for measuring the coefficient of variation of a whole-body contamination monitor, which are used to solve the problems of lack of stability in the measurement method and large radiation dose to workers in the prior art.

[0005] The technical solution of the present invention is as follows:

[0006] The present invention proposes a device for measuring the coefficient of variation of a whole-body contamination monitor. The device includes a cross bar, a pan-tilt, and a pan-tilt base. A plurality of positioning holes are provided on the cross bar, and the cross bar fixes the pan-tilt base at different positions through the positioning holes. A pan-tilt is provided on the pan-tilt base, and the pan-tilt is used to fix a radioactive source.

[0007] In some embodiments, a snap ring is provided on the pan-tilt, and the snap ring is used to fix the radioactive source.

[0008] In some embodiments, the pan-tilt base is fixedly connected to the positioning hole of the cross bar through a handle screw.

[0009] In some embodiments, internal threads are provided at both ends of the cross bar, and the internal threads are connected to a tightening screw, and the tightening screw is used to adjust the axial length of the device.

[0010] The present invention proposes a method for measuring the coefficient of variation of a device for measuring the coefficient of variation of a whole-body contamination monitor. The method includes:

[0011] Step 1: Adjust the tightening screws at both ends of the cross bar to fix the device on a portal whole-body contamination monitor;

[0012] Step 2: Set a radioactive source on the pan-tilt and measure the source-carrying counting rate X at different positions multiple times;

[0013] Step 3: Calculate the coefficient of variation V using Formula 1,

[0014]

[0015] where S is the standard deviation of multiple measurement values, and is the average value of the source-carrying count rates at different positions measured multiple times.

[0016] In some embodiments, in Step 2, a radiation source is set on the turntable, and the source-carrying count rates X at different positions are measured multiple times. Specifically, it includes:

[0017] Step 2.1: Set the radiation source on the turntable through a circlip, fix the turntable in the positioning hole on the crossbar, and measure the source-carrying count rate using a portal whole-body contamination monitor;

[0018] Step 2.2: Fix the turntable in other positioning holes, and repeat the measurement process in Step 2.1 to measure the source-carrying count rate.

[0019] In some embodiments, the standard deviation S of the multiple measurement values in Step 3 is calculated by Formula 2.

[0020]

[0021] where S is the standard deviation of n measurement values, Xi is the source-carrying count rate of the i-th measurement, is the average value of the source-carrying count rates measured n times, and n is the number of measurements.

[0022] Implementing the present invention has the following beneficial effects:

[0023] The present invention provides a device and a measurement method for measuring the coefficient of variation of a whole-body contamination monitor. Implementing the present invention has the following advantages:

[0024] 1. This device is fixed using a top screw, avoiding holding or pasting to fix the device during radiation source calibration and efficiency detection. It is stably fixed and does not require manual holding, reducing labor costs and the radiation dose received by the staff.

[0025] 2. This device is provided with multiple positioning holes, which can quickly and accurately fix the radiation source in the correct position, measure stable and accurate data, precisely calculate the coefficient of variation V, improve the efficiency of maintenance personnel in maintaining the equipment, shorten the working hours of maintenance personnel, and ensure the effectiveness of detector inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the device for measuring the coefficient of variation of a whole-body contamination monitor proposed in the embodiment of the present invention;

[0027] Figure 2Schematic diagram of disassembly of a coefficient of variation measurement device for a whole-body contamination monitor proposed in an embodiment of the present invention;

[0028] Figure 3 Installation schematic diagram of a coefficient of variation measurement device for a whole-body contamination monitor proposed in an embodiment of the present invention;

[0029] Description of the drawings: 1. Cross bar; 2. Cloud platform base; 3. Cloud platform; 4. Handle screw; 5. Tightening screw; 6. Snap ring; 7. Radiation source. Detailed implementation manners

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the drawings and specific implementation manners. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] As Figures 1 to 3 shown, the present invention proposes a coefficient of variation measurement device for a whole-body contamination monitor. The device includes a cross bar 1, a cloud platform 3 and a cloud platform base 2. The cross bar 1 has a plurality of positioning holes for positioning and adjustment. The cross bar 1 fixes the cloud platform base 2 through the positioning holes. A cloud platform 3 is provided on the cloud platform base 2, and the cloud platform 3 is used to fix the radiation source 7. The cloud platform 3 and the cloud platform base 2 are fixed on the cross bar 1 together through the handle screw 4. The handle screw 4 is screwed into the positioning hole and tightened for fixation. The radiation source 7 is placed on the cloud platform 3 and fixed by a snap ring 6. Both ends of the cross bar 1 are provided with internal threads, and the internal threads are connected to the tightening screws 5. The cross bar 1 adjusts the length of the device by tightening or loosening the tightening screws 5 on both sides, so that the device is tightly fixed on the portal whole-body contamination monitor. This device uses the tightening screws 5 for fixation, with stable fixation and no need for manual holding, reducing labor costs and the radiation dose received by the staff.

[0032] The present invention proposes a measurement method for a coefficient of variation measurement device for a whole-body contamination monitor. The method includes:

[0033] Step 1: Adjust the tightening screws 5 at both ends of the cross bar 1 to fix the device on the portal whole-body contamination monitor;

[0034] Step 2: Set a radiation source 7 on the cloud platform 3 and measure the source-carrying count rate X at different positions multiple times;

[0035] Step 2.1: Set a radiation source 7 on the cloud platform 3 through a snap ring 6, fix the cloud platform 3 in the positioning hole on the cross bar 1, and use the portal whole-body contamination monitor to measure the source-carrying count rate;

[0036] Step 2.2: Fix the cloud platform 3 in other positioning holes and repeat the measurement process in Step 2.1 to measure the source-carrying count rate.

[0037] Step 3: Calculate the coefficient of variation V using Equation 1.

[0038]

[0039] Where S is the standard deviation of multiple measurement values, and is the average value of the source count rate at different positions of multiple measurements.

[0040] In some embodiments, the standard deviation S of multiple measurement values is calculated by Equation 2.

[0041]

[0042] Where S is the standard deviation of n measurement values, Xi is the source count rate of the i-th measurement, is the average value of the source count rate of n measurements, and n is the number of measurements. This device is provided with multiple fixing holes, which can quickly and accurately fix the radiation source 7 in the correct position, measure stable and accurate data, precisely calculate the coefficient of variation V, improve the efficiency of maintenance personnel in maintaining the equipment, shorten the working hours of maintenance personnel, and ensure the effectiveness of detector inspection.

[0043] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent of the present invention shall be subject to the appended claims.

Claims

1. A device for measuring the coefficient of variation of a whole body contamination monitor, characterized in that: The device comprises a crossbar (1), a pan platform (3) and a pan platform seat (2); the crossbar (1) is provided with a plurality of positioning holes; the pan platform seat (2) can be fixed at different positions of the crossbar (1) through the positioning holes; the pan platform (3) is provided on the pan platform seat (2); and the pan platform (3) is used to fix the radiation source (7).

2. A device for measuring coefficient of variation of a whole body contamination monitor according to claim 1, characterized in that: The pan / tilt platform (3) is provided with a retaining spring (6), and the retaining spring (6) is used to fix the radiation source (7).

3. A device for measuring coefficient of variation of a whole body contamination monitor according to claim 2, characterized in that: The platform seat (2) is fixedly connected to the positioning hole of the cross bar (1) via a handle screw (4).

4. A device for measuring coefficient of variation of a whole body contamination monitor according to claim 3, characterized in that: Both ends of the crossbar (1) are provided with internal threads, the internal threads are connected to a tightening screw (5), and the tightening screw (5) is used to adjust the axial length of the device.

5. A measuring method for a device for measuring the coefficient of variation of a whole body contamination monitor, characterized in that: The method includes: Step 1: Adjust the tightening screws (5) at both ends of the crossbar (1) to fix the measuring device on the portal whole-body contamination monitor; Step 2: Setting a radiation source (7) on the pan / tilt table (3) and measuring the source count rate X at different positions for multiple times; Step 3: Use formula 1 to calculate the coefficient V. Where S is the standard deviation of multiple measurements, It is the average value of the band source counting rate measured multiple times at different positions.

6. The measuring method of the device for measuring the coefficient of variation of a whole body contamination monitor according to claim 5, characterized in that: In the second step, a radiation source (7) is arranged on the pan / tilt table (3), and the source count rate X at different positions is measured multiple times, which specifically includes: Step 2.1: a radioactive source (7) is arranged on the pan-tilt table (3) by means of a retaining spring (6), the pan-tilt table (3) is fixed in a positioning hole on the crossbar (1), and the measuring device is used to measure the band source count rate; Step 2.2: Fix the pan / tilt platform (3) in other positioning holes and repeat the measurement process of step 2.1 to measure the band source count rate.

7. The measuring method of the device for measuring the coefficient of variation of a whole body contamination monitor according to claim 6, characterized in that: The standard deviation S of the multiple measurements in step 3 is calculated by formula 2: Where S is the standard deviation of the n-th measurement, Xi is the band source count rate of the ith measurement, is the average value of the band source count rate of n measurements, where n is the number of measurements.

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