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Shield assembly for directional measurement of gamma radiation source and method for measuring ray incident angle

A technology of gamma radiation source and shielding body, which is applied in the field of radiation measurement, can solve the problems of large search area, inability to accurately determine the radiation source, and long working time of detectors, so as to avoid harm and reduce the dose received.

Active Publication Date: 2019-03-26
CHINA INST FOR RADIATION PROTECTION
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] At present, most of the surrounding dose equivalent monitors and personal dose equivalent monitors cannot accurately determine the location of radioactive sources. For traditional radioactive source searches, people often carry radiation detectors to search for radioactive sources or contaminated areas on foot. It will cause the detection personnel to work for a long time, and the search area is large, thus increasing the radiation dose of the operators

Method used

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  • Shield assembly for directional measurement of gamma radiation source and method for measuring ray incident angle
  • Shield assembly for directional measurement of gamma radiation source and method for measuring ray incident angle
  • Shield assembly for directional measurement of gamma radiation source and method for measuring ray incident angle

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Embodiment

[0040] A specific implementation design method for the positioning of gamma radiation source or radiation hot zone, including shielding body assembly, ф76.2mm×76.2mm NaI(Tl) probe receiving device, ф76.2mm×76.2mm NaI(Tl) probe, power supply and data Get the system.

[0041] The ф76.2mm×76.2mm NaI(Tl) probe is placed in the receiving device, and then the shield assembly is covered on the ф76.2mm×76.2mm NaI(Tl) probe, the probe and the data acquisition system are connected, and the Power supply, determine the relationship expression R(θ) between the special response R function and the angle θ of the position of the radiation source.

[0042] The actual measurement process is as Figure 4, place the detector at one point, choose a reference point, measure the all-energy peak counting rate A at this place, and then use this as the reference point, rotate the lead shielding layer 90° clockwise in turn, and rotate it 3 times in total, and you can get 3 All-energy peak count rates ...

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Abstract

The invention belongs to the radiation measurement technical field and relates to a shielding body assembly used for gamma radioactive source orientation measurement and a ray incident angle measurement method. The shielding body assembly comprises a shielding barrel covering a measuring probe; the shielding barrel is made of a material which has a large mass attenuation coefficient for gamma rays; the upper part of the shielding barrel is of a solid cylindrical structure; the lower part of the shielding barrel is of a hollow diagonal beveled cylindrical structure; after being unfolded, the hollow diagonal beveled cylindrical structure is an isosceles triangle; and the measuring probe is arranged in the hollow beveled cylindrical structure. Combined with a background automatic deduction algorithm, the measurement method can quickly determine the position of a radioactive source and a radioactive hot area in a nuclear terrorist incident, and avoid harm caused by radiation and reduce doses to which operating personnel is subjected.

Description

technical field [0001] The invention belongs to the technical field of radiation measurement, and in particular relates to a shield assembly for directional measurement of a gamma radiation source and a method for measuring a ray incident angle. Background technique [0002] Today, with the rapid development of nuclear technology, radioactive sources are widely used in the fields of industry, agriculture, scientific research, and medicine. However, in the process of using and storing radioactive sources, frequent incidents of losing radioactive sources have brought fear and other negative effects to the public. Therefore, in the case of decommissioning of radioactive sites, assessment of remote radioactive status, radioactivity distribution of decontaminated sites, emergency response to nuclear accidents, especially nuclear terrorist incidents, etc., the rapid positioning of radioactive sources and the accurate measurement of their activity have become the key to the detecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/00
Inventor 邓中华唐智辉韦应靖商洁陈立王勇牛蒙青冯梅崔伟张歆炜
Owner CHINA INST FOR RADIATION PROTECTION
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