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Low air kerma measurement method based on proportional counter type secondary standard

A technology of air kerma and proportional counter, which is applied in the field of ionizing radiation testing and can solve the problems of low sensitivity and poor accuracy of ionization chambers

Pending Publication Date: 2022-03-25
中测测试科技有限公司
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Problems solved by technology

[0002] Air kerma rate radiation protection standard devices often use free air ionization chambers or spherical graphite ionization chambers for value transfer work. Due to the relatively low sensitivity of ionization chambers, there is a problem of accuracy when measuring in the range of low air kerma rate ranges. poor degree of problem

Method used

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  • Low air kerma measurement method based on proportional counter type secondary standard
  • Low air kerma measurement method based on proportional counter type secondary standard
  • Low air kerma measurement method based on proportional counter type secondary standard

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Embodiment Construction

[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. Firstly, a large-volume proportional counter-type nuclear radiation detector is combined with a high-voltage module, an ultra-low power consumption charge-sensitive preamplifier, a pulse discriminator and a counter to form a secondary standard measurement system, such as figure 1 shown.

[0039] The interior of the proportional counter is filled with a mixed gas of high atomic number xenon and nitrogen to realize high-sensitivity detection of X / γ-rays; the high-voltage module is realized by an adjustable positive high voltage (0~+5000V) module, which is provided to the proportional counter to form an internal The electric field collects the ionization signal of the ray inside the detector; the ultra-low power consumption charge-sensitive preamplifier completes the pulse rapid amplification of the ionization signal, the power consumption...

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Abstract

The invention discloses a low air kerma rate measurement method based on a proportional counter type secondary standard device. The secondary standard device is composed of a proportional counter, an ultra-low power consumption charge sensitive preamplifier, a pulse discriminator and the like. Counting-dose conversion factor calibration under X and gamma approximate monoenergy ray conditions is completed in a radiation protection X / gamma national standard or secondary standard device laboratory, and a counting-dose conversion factor calibration curve is solved by using counting-dose conversion factor calibration discrete data; a secondary standard device is adopted to measure a count value of a low-dose-rate radiation field at a fixed position under an irradiation condition and a count value of a natural background; and multiplying a value obtained by deducting a natural background count value from a count value under an irradiation condition by a count-dose conversion factor value under a corresponding energy condition or a weighted count-dose conversion factor value under a multi-characteristic energy condition to obtain a low air kerma rate value. According to the invention, the problem of low air kerma rate measurement value traceability of the environmental level dosimeter can be solved.

Description

technical field [0001] The invention relates to the technical field of ionizing radiation testing, in particular to a method for measuring low air kerma rate based on a proportional counter-type secondary standard. Background technique [0002] Air kerma rate radiation protection standard devices often use free air ionization chambers or spherical graphite ionization chambers for value transfer work. Due to the relatively low sensitivity of ionization chambers, there is a problem of accuracy when measuring in the range of low air kerma rate ranges. poor degree of problem. [0003] Proportional counter nuclear radiation detectors have higher sensitivity than ionization chambers, and have obvious advantages in temperature stability compared with scintillation detectors and semiconductor detectors. The secondary standard measurement system established by the proportional counter nuclear radiation detector can effectively solve the problem of traceability measurement of low air...

Claims

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Application Information

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IPC IPC(8): G01T7/00G01T1/02
CPCG01T7/005G01T1/02
Inventor 黄平黄秋龚岚林滔
Owner 中测测试科技有限公司
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