Low background gamma energy dispersive spectrometer for ocean radioactive measurement

Abstract

The invention discloses a low background gamma energy dispersive spectrometer for ocean radioactive measurement. The low background gamma energy dispersive spectrometer for the ocean radioactive measurement comprises a crystal array detecting module composed of six NaI (T1) crystal sensors, a signal processing module and an upper computer. The six NaI (T1) crystal sensors are evenly divided into three groups. The two NaI (T1) crystal sensors in each group are arranged oppositely. Crystal end faces of the six NaI (T1) crystal sensors are adjacent so that a zone used for placing a sample box is defined. Six ways of output detected signals are detected by the six NaI (T1) crystal sensors, transmitted to the signal processing module, processed to energy spectrum signals through the signal processing module and transmitted to the upper computer. The energy dispersive spectrometer can be used for conducting rapid detection on radionuclide content in a marine environment, suitable for laboratory detection and field monitoring of vehicle mounting and ship mounting and capable of being popularized and used in detection works of other samples with low radioactivity except for the marine environment.

Description

technical field [0001] The invention belongs to the technical field of marine radioactivity detection, and in particular relates to a gamma energy spectrometer used for radioactive detection of the marine environment. Background technique [0002] The nuclear leakage accident caused by the explosion of the Fukushima nuclear power plant in Japan has caused serious radioactive pollution to the marine environment, which has also made the detection and monitoring of marine radioactive pollution highly valued. [0003] For a long time, my country's marine radioactivity testing has been dominated by laboratory testing. Several times a year, samples of seawater, seabed sediment and marine organisms are collected at several stations in key sea areas, and brought back to the laboratory for sample processing and analysis. Since the existing mature gamma spectrometer can only detect substances with high radioactive content, and for marine substances with low radioactivity, they must ...

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Problems solved by technology

Therefore, a test often takes 2 to 3 days, the procedure is cumbersome, time-consuming and labor-intensive

Not only that, this non-real-time and intermittent inspection mode is also impossible to realize timely and effective monitoring of marine radioactive pollution, and it is even more difficult to make forecasts and early warnings

[0004] Due to the low level of radioactivity in the marine environment, the content of other radionuclides in seawater and most organisms except K-40 is extremely low. Therefore, it is currently used on land for soil, building materials, rocks, food, etc. The mature gamma spectrometer for on-site radioactivity detection cannot meet the requirements of on-site monitoring of marine radioactive pollution in terms of detection efficiency and detection sensitivity. Therefore, it is urgent to establish an ultra-low background detection instrument suitable for marine radioactivity detection. For on-site monitoring of marine radionuclide content

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