3He proportional counter neutron energy response compensation method via perforated cadmium sheet

A proportional counter, neutron energy technology, applied in the field of radiation measurement, can solve problems such as measurement error, achieve the effect of improving response and realizing low-energy compensation

Inactive Publication Date: 2015-04-15
CHINA INST FOR RADIATION PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical application process, 3 The response of the He proportional counter in the low-energy section is obviously higher than the fluence-dose conversion curve

Method used

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  • 3He proportional counter neutron energy response compensation method via perforated cadmium sheet
  • 3He proportional counter neutron energy response compensation method via perforated cadmium sheet
  • 3He proportional counter neutron energy response compensation method via perforated cadmium sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this embodiment, the cadmium sheet material with perforated surface is used to lower the 3 The response of the low-energy section of the He proportional counter makes the response of the counter in the energy range of 0.025-20 Mev closer to the fluence-dose conversion curve given in the ICRP74 publication, effectively reducing the measurement uncertainty.

[0025] During measurement, neutrons with higher energy are first moderated by polyethylene, and the energy of neutrons gradually decreases until it reaches thermal neutrons. The neutrons after moderation enter the detector and 3 He reacts to release protons, and the protons generate pulses in the electronic system during the movement to the negative pole to complete the measurement of neutrons.

[0026] The moderation distance from neutrons with different energies to thermal neutrons is different. Generally speaking, neutrons with lower energy require a shorter moderation distance, and neutrons with higher energy ...

Embodiment 2

[0031] In this embodiment, the thickness of the material layer of the cadmium sheet is 1 mm, and the cadmium sheet is evenly punched with holes of φ2 mm, and the area of ​​the holes accounts for 10% of the area of ​​the entire cadmium sheet.

[0032] There is a certain gap between the cadmium sheet and the proportional counter, the gap is filled with moderator material, the cadmium sheet and the proportional counter 3 The distance between the He proportional counters is 30mm, so that the neutrons can be sufficiently slowed down.

Embodiment 3

[0034] In this embodiment, the thickness of the material layer of the cadmium sheet is 5 mm, and holes of φ10 mm are evenly punched on the cadmium sheet, and the area of ​​the holes accounts for 20% of the area of ​​the entire cadmium sheet.

[0035] There is a certain gap between the cadmium sheet and the proportional counter, the gap is filled with moderator material, the cadmium sheet and the proportional counter 3 The distance between the He proportional counters is 2mm.

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Abstract

The invention relates to a 3He proportional counter neutron energy response compensation method via a perforated cadmium sheet, and belongs to the field of radiation measurement. In the existing methods, response of a 3He proportional counter in a low-energy stage is obviously higher than that of a fluence dose conversion curve given by the publication NO. 74 of the International Commission of Radiological Protection (ICRP), and major errors are brought to practical measurement work if compensation is not performed. According to the method, a layer of thin cadmium sheet wraps outside the 3He proportional counter, and a certain number of pores are perforated on the surface of the thin cadmium sheet. With application of the method, low-energy compensation can be realized and response of the 3He proportional counter to low-energy neutrons can be effectively improved.

Description

technical field [0001] The invention belongs to the field of radiation measurement, in particular to a perforated cadmium sheet compensation 3 He proportional counter neutron energy response method. Background technique [0002] Proportional counter (proportional counter) is a device for measuring radioactive intensity. The gas-filled tube or small chamber is used as the probe. When the voltage applied to the probe is within a certain range, the pulse size and the energy of the ray caused by ionization in the tube In direct proportion, the electronic system connected to the probe can analyze rays of different energies and measure the intensity of rays of different energies. [0003] 3 He proportional counters are widely used in neutron measurement activities due to their high detection efficiency and convenient use. 3 He proportional counter is 3 The He(n,p)T reaction detects neutrons, 3 The reaction cross section of He gas and neutron is related to the neutron energy, ...

Claims

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Application Information

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IPC IPC(8): G01T1/18
Inventor 刘建忠王勇刘倍徐园刘惠英
Owner CHINA INST FOR RADIATION PROTECTION
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