Low-background anticoincidence closed-gas proportional counter for measuring alpha and beta surface pollution and manufacturing method thereof

A proportional counter and surface pollution technology, applied in the field of nuclear radiation detectors, can solve the problems of increased background, increased minimum detectable lower limit of detectors, and missed pollution reports.

Pending Publication Date: 2020-07-31
SHANXI ZHONGFU NUCLEAR INSTR CO LTD
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Problems solved by technology

In the case of surface pollution measurement, the increase of the background will increase the minimum detectable lower limit of the detector, reduce the detection performance of the detector, and cause the risk of pollution underreporting

Method used

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  • Low-background anticoincidence closed-gas proportional counter for measuring alpha and beta surface pollution and manufacturing method thereof
  • Low-background anticoincidence closed-gas proportional counter for measuring alpha and beta surface pollution and manufacturing method thereof
  • Low-background anticoincidence closed-gas proportional counter for measuring alpha and beta surface pollution and manufacturing method thereof

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Embodiment Construction

[0034] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] like figure 1 and figure 2 As shown, the present invention provides a low-background anti-coincidence air-closed proportional counter for measuring α and β surface contamination, including a measurement chamber 2 and an anti-coincidence measurement chamber 3; between the measurement chamber 2 and the anti-coincidence measurement chamber 3 Separated by a baffle 4; the baffle 4 can block alpha rays and beta rays and allow cosmic rays and environmental gamma rays to pass through.

[0036] The invention adopts the anti-coincidence measurement method to realize the effect of reducing the background. The anti-coincidence measurement method refers to the measurement process that uses an anti-coincidence system to eliminate coincidence events. Different detectors detect simultaneous events, and use an N-channel coincidence circuit composed of analy...

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Abstract

The invention relates to a low-background anticoincidence closed-gas proportional counter for measuring alpha and beta surface pollution and a manufacturing method thereof. The counter comprises a measuring chamber, an anticoincidence measuring chamber and a baffle between the measuring chamber and the anticoincidence measuring chamber. The baffle can block alpha rays and beta rays so that cosmicrays and environment gamma rays can pass through the baffle. The manufacturing method comprises the following steps: cleaning each part for the first time; assembling and fixing the components; cleaning the assembled detector again; performing gas replacement and passivation on the detector; and pressurizing, sealing and carrying out performance test. The method has the beneficial effects that theinfluence of cosmic rays and environmental gamma rays can be reduced, so that the background of the detector and the lowest detectable lower limit are reduced, and the performance of radiation measurement is improved. The plateau inclination of the detector is below 3% / 100V, the plateau length is more than 200V, the 90Sr-90Y efficiency of the beta radioactive source measured close to the surfaceof the incident window is greater than 60%. The alpha radioactive source 239 Pu efficiency is larger than 30%, the lowest detectable lower limit of beta is smaller than 0.12 Bq / cm <2>, the lowest detectable lower limit of alpha is smaller than 0.02 Bq / cm <2>, the counting service life is not smaller than 1.0 E12, and the shelving service life is one year or longer.

Description

technical field [0001] The invention belongs to the field of nuclear radiation detectors, and in particular relates to a low-background anti-coincidence air-tight proportional counter for measuring alpha and beta surface pollution and a manufacturing method thereof. Background technique [0002] The background of all nuclear radiation detectors is composed of radiation background and noise background, mainly including cosmic rays, electronic noise, radioactive radiation of the detector itself, and environmental gamma rays. The background level directly affects the performance of the radiation detector. For the occasion of surface pollution measurement, the increase of the background will increase the minimum detectable lower limit of the detector, reduce the detection performance of the detector, and cause the risk of pollution underreporting. When measuring, it is necessary to reduce the influence of cosmic rays and environmental γ-rays on the background as much as possibl...

Claims

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Application Information

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IPC IPC(8): G01T1/169G01T1/185
CPCG01T1/169G01T1/185
Inventor 任熠郭喜荣乔莉杜向阳郭强张佳盛佳刘晋瑾苗宇星侯磊
Owner SHANXI ZHONGFU NUCLEAR INSTR CO LTD
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