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Device and method for measuring activation rate of radionuclide

A technology of radionuclide and measurement method, which is applied in the measurement field of well-type HPGe detectors, can solve the problems of inability to accurately measure gamma-ray emission probability and high cost of target nuclide, and achieve wide energy range coverage, accurate scale, The effect of improving the detection efficiency

Active Publication Date: 2019-09-27
NORTHWEST INST OF NUCLEAR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual work, it is often impossible to prepare a large number of relatively pure target nuclides, or the cost of preparing target nuclides is too high; sometimes even if the calibration coefficient of the target nuclide is produced and calibrated, it can only be used for the activity quantification of the target nuclide , other parameters such as the emission probability of gamma rays cannot be measured more accurately
Therefore, this method has many disadvantages

Method used

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  • Device and method for measuring activation rate of radionuclide
  • Device and method for measuring activation rate of radionuclide
  • Device and method for measuring activation rate of radionuclide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 241 Am(n,2n) 240 Measurement of Am reaction activation rate

[0050] 1) Select a well-type HPGe detector with a well height of 50mm and an inner diameter of 15mm, use Pb as the absorber material, and polypropylene as the measurement source container material, and the dimensions of the measurement source container and absorber are shown in Table 1 below;

[0051] Table 1 Measurement source container and absorber size information table

[0052]

[0053]

[0054] 2) with known radioactivity 137 Cs, 95 Zr, 95 Nb and 65 Zn solution prepares the efficiency calibration solution, and the measuring source container is placed in the absorber, and then the absorber is placed in the well of the well-type HPGe detector, and the measurements are carried out respectively;

[0055] 3) Measured to get 137 Cs(662keV), 95 Zr (724, 756keV), 95 Nb(765keV) and 65 The detection efficiencies of the five γ-rays of the four nuclides of Zn (1115keV) are η 1 , η 2 , η 3 , η 4 a...

Embodiment 2

[0066] 197 Au(n, 2n) 196 Measurement of Au Reaction Activation Rate

[0067] 1) See Table 1 for the materials and dimensions of the well-type HPGe detector, measurement source container, and absorber;

[0068] 2) with known radioactivity 47 Sc, 51 Cr, 85 Sr and 137 Prepare the efficiency calibration solution with Cs solution, and place the measuring source container in the absorber, then place the absorber in the well of the well-type HPGe detector, and measure respectively;

[0069] 3) Measured to get 47 Sc(159keV), 51 Cr(320keV), 85 Sr(514keV) and 137 The detection efficiencies of the four γ-rays of the four nuclides of Cs (662keV) are η 1 , η 2 , η 3 and η 4 , using the least squares method to perform log-logarithmic polynomial fitting on these 4 sets of data, the efficiency curve fitting formula is obtained as

[0070] lnη=a 0 +a 1 (lnE)+a 2 (lnE) 2 +a 3 (lnE) 3 +a 4 (lnE) 4

[0071] +a 5 (lnE) 5

[0072] where a 0 、a 1 、a 2 、a 3 、a 4 and a ...

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Abstract

The present invention relates to a radionuclide activating rate measurement device and method. The device comprises a trap type HPGe detector, an absorbing body used for absorbing the low-energy gammaand X rays and a measurement source container. The absorbing body is located in a trap of the trap type HPGe detector, the measurement source container is located in an inner cavity of the absorbingbody, the measurement source solution is located in the measurement source container, and the absorbing body and the measurement source container are both circular cylinders. The activating rate measurement method of the device mainly comprises the steps of 1) utilizing N nuclides to prepare the efficiency calibration solution; 2) measuring the detection efficiency in the efficiency calibration solution or the gamma-ray energy; 3) obtaining the gamma-ray energy of the to-be-measured X nuclide and the detection efficiency of the gamma-rays; 4) calculating the activity of the to-be-measured X solution; 5) calculating the activating rate via the activity. According to the present invention, by utilizing the efficiency calibration solution of various nuclides of which the decay schemes are simple and the activities are known, the activity of the target nuclide of which the decay scheme is complex is measured accurately.

Description

technical field [0001] The invention relates to gamma-ray measurement technology in the field of nuclear technology, in particular to a measurement method technology of a well-type HPGe detector. Background technique [0002] The intensity of gamma rays is often measured using NaI(Ti), Ge(Li) and HPGe detectors, among which HPGe detectors are popular because of their good energy resolution. When using a coaxial HPGe detector to measure gamma rays of radionuclides, in order to ignore the cascade coincidence effect that may occur when measuring gamma rays, the measurement source is often placed at a position 25 cm above the detector surface. The position is high and the measurement solid angle is small, which makes the detection efficiency very low. [0003] The well-type HPGe detector has a relatively high detection efficiency because the measurement source is located in the crystal well and the measurement solid angle is relatively large. However, improving the detection e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/16
Inventor 夏子恒师全林解峰李雪松凡金龙
Owner NORTHWEST INST OF NUCLEAR TECH