Detector for monitoring environmental radiation dose rate

Abstract

The invention belongs to the field of radiation protection, and provides a detector for measuring the environmental level X ray and gamma ray radiation dose rate. The detector comprises a shell and a high atmospheric pressure ionization chamber. The outer wall of the high atmospheric pressure ionization chamber is of a spherical structure. An end cover through which the ionization chamber is conveniently connected with other parts inside the detector is arranged at the bottom of the outer wall. A spherical inner container which is concentric with the outer wall is arranged inside the ionization chamber. The inner container is connected with the end cover through an insulator. Except welding components of the insulator, the whole ionization chamber is made of aluminum or aluminum alloy. The detector is simple in structure and convenient to use, the problem that the high atmospheric pressure ionization chamber is high in energy lower limit in the environment monitoring process can be effectively solved, the sensitivity of the detector to lower-energy gamma rays is improved, energy response linearity and isotropy of the detector are improved, and credibility of the measuring result is improved.

Description

technical field [0001] The invention belongs to the field of radiation protection, and relates to a detector for measuring the dose rate of X and gamma ray radiation at the environmental level. Background technique [0002] Environmental radiation dose rate monitoring is an important aspect of environmental monitoring. The radiation dose rate of X and gamma rays (hereinafter referred to as rays) in the atmospheric environment is monitored in real time by the monitor to obtain changes in the intensity of radioactive substances in the atmospheric environment. Abnormal changes in radioactive substances provide a basis for environmental assessment and accident alarms. [0003] Traditional environmental radiation dose rate monitors mainly use two types of nuclear radiation detectors, GM tubes and high-pressure ionization chambers. Among them, GM tubes are rarely used as precise measuring instruments because of their short service life and large statistical fluctuations. High-pr...

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Problems solved by technology

[0004] The high-pressure ionization chamber made of stainless steel also has the disadvantage of poor energy response linearity, and the measurement results of gamma radiation fields with the same radiation dose rate and different energies have large deviations, resulting in insufficient accuracy of measurement results and poor data reliability.

Some detectors with unreasonable structures still have disadvantages such as poor isotropy and poor electromagnetic compatibility, which limits the promotion of high-pressure ionization chambers in environmental monitoring

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