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High-sensibility neutron dose equivalent instrument

A neutron dose and sensitive technology, applied in the field of nuclear detection, can solve the problem that the sensitivity cannot meet the needs of neutron radiation field detection

Inactive Publication Date: 2008-09-03
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

The sensitivity of the existing neutron dose equivalent instrument can not meet the needs of environmental neutron radiation field detection

Method used

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  • High-sensibility neutron dose equivalent instrument

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Embodiment Construction

[0008] The technical solution of the present invention will be further elaborated below in conjunction with the accompanying drawings.

[0009] A neutron dose equivalent meter, which consists of three parts: a probe, a signal acquisition and data processing system, and a loading trolley. The probe, signal acquisition and data processing system are installed on the loading trolley, and the signal detected by the probe is transmitted to the signal acquisition and data processing. The system processes and prints the display. The probe consists of 5 coaxial cylinders, from inside to outside are: 3 He counting tube 5, inner polyethylene moderator 1, cadmium absorber 4, outer polyethylene moderator 2, stainless steel packaging material 6. the selected 3 The length of He counter tube 5 is 95~110 ​​centimetres, and diameter is 5~6 centimetres, and air pressure is 3~4 atmospheres. Holes are evenly punched on the cadmium absorber 4, and the area of ​​each hole is 0.9 to 1 square cent...

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Abstract

The invention discloses a high response neutron dose equivalent meter. The probe of the equivalent meter is selected from 3He counter tube, the length thereof is 95-110 centimeter, the diameter thereof is 5-6 centimeter, the air pressure thereof is 3-4 atmospheric pressure. At the same time, the cadmium absorber of probe is evenly drilled, wherein the hole area is 0.9-1 square centimeter, the hole area accounts for 30-40% of the whole cadmium slice area. The sensitivity of the neutron dose equivalent meter can be 48.9cps / uSv h-1 to satisfy the requirement of the detection of the environment level neutron radiation field.

Description

technical field [0001] The invention belongs to the technical field of nuclear detection, in particular to a highly sensitive neutron dose equivalent meter. Background technique [0002] The neutron dose equivalent meter is a detector system used to measure the personal effective dose or effective dose equivalent of neutrons in the radiation field. It generally consists of two parts: a probe, a signal acquisition and a data processing system. The commonly used physical response of the probe is BF 3 Proportional counter tube 10 B(n,α), 3 He proportional counter 3 He(n, P), LiI scintillation counter 6 Li(n,α), etc., occasionally also use activation detectors and solid-state detectors. Its exterior is wrapped in moderator materials such as polyethylene or paraffin. For example, the probe used in a typical neutron dose equivalent meter without internal absorber adopts BF 3 Proportional counter tube, cylindrical, BF 3 The counting tubes are arranged along the axis of the ...

Claims

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Application Information

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IPC IPC(8): G01T3/00
Inventor 刘森林魏迎光韩善彪袁观俊陈凌
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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