Gamma ray collimator for reference gamma radiation field

A gamma ray, collimator technology, applied in the use of aperture/collimator, radiation/particle processing, nuclear engineering, etc., can solve the problems of passive acceptance, inability to scale and calibrate, affecting the overall performance of the device, etc.

Active Publication Date: 2015-05-06
NO 719 RES INST CHINA SHIPBUILDING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lack of a targeted simulation calculation design process, the actual use effect can only be passively accepted, which affects the overall performance of the device
The use of a radiation field wit...

Method used

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  • Gamma ray collimator for reference gamma radiation field
  • Gamma ray collimator for reference gamma radiation field

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Embodiment Construction

[0015] The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0016] like figure 1 and figure 2 As shown, the present embodiment provides a kind of gamma ray collimator for reference gamma radiation field, and the processing method of this device is as follows:

[0017] (1) First, select a collimator with an appropriate length according to the activity of the radioactive source. The length of the collimator given in the attached figure is 203mm, which can meet the requirements of radioisotope radiation devices with an activity within 50Ci;

[0018] (2) According to the γ-ray energy of the radioactive source, select the attached figure 1 or attached figure 2 The design scheme shown; when the γ-ray energy of the radiation source is between 0.01MeV and 0.7MeV, the projection A of the vertex A of the triangular section of the annular groove of the collimator diaphragm on the horizontal p...

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Abstract

The invention relates to the technical field of nuclear radiation measurement calibration, and provides a gamma ray collimator for a reference gamma radiation field. The gamma ray collimator comprises a collimating diaphragm, a light path of the collimating diaphragm is in the shape of a truncated cone, an incident window of the collimating diaphragm is flared, a launch window of the collimating diaphragm is extended based on the edge of the light path, a plurality of annular grooves are formed in the inner surface of the collimating diaphragm, the sections of the annular grooves are triangular, vertexes of all triangles in the same section are positioned on the same horizontal plane, bottom edges of all the triangles are positioned on the same edge of the light path, the triangular sections of the annular grooves are varied with energy of radioactive source gamma ray energy, and different energy dispersion gamma photons are scattered backwards. Scattered gamma photon reduction capacity of the reference gamma radiation field collimator can be improved, and uniformity and accuracy of the radiation field are improved.

Description

technical field [0001] The invention relates to the technical field of nuclear radiation metrology calibration, in particular to a gamma ray collimator for referring to a gamma radiation field. Background technique [0002] The establishment of a reference radiation field is the key to nuclear radiation metrology technology, and its accuracy and uncertainty are important indicators to measure the quality of a reference radiation field, which directly affects the scope of use of reference radiation. According to the relevant technical requirements of GB / T12162, the scattering effect of the reference gamma radiation field should not exceed 5%, and the deviation of the radiation field dose rate at different distances from the inverse square rate should not exceed 5%. There are many factors that produce scattered photons, mainly including ray collimator, spatial layout of the radiation room, and auxiliary facilities of the device. For the spatial layout of the radiation room, t...

Claims

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Application Information

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IPC IPC(8): G21K1/04G21K1/10
CPCG21K1/04G21K1/10
Inventor 罗鹏祝娇徐卫峰郑文祥傅晨雨代传波许浒郭智荣
Owner NO 719 RES INST CHINA SHIPBUILDING IND
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