Method for screening and treating output signals of lanthanum bromide gamma spectrometer and application thereof

Abstract

The invention discloses a method for screening and treating output signals of a lanthanum bromide gamma spectrometer and application thereof, wherein the output signals are radiation signals of gamma ray and alpha particles. The method for screening and treating the output signals of the lanthanum bromide gamma spectrometer includes the steps of: using the lanthanum bromide gamma spectrometer to detect the radiation of an object to be detected so as to obtain the output signals; analyzing the output signals so as to obtain characteristic quantity of the gamma ray and characteristic quantity of the alpha particles; obtaining a distribution diagram of the characteristic quantity of the gamma ray and the characteristic quantity of the alpha particles along with energy based on the characteristic quantity of the gamma ray and the characteristic quantity of the alpha particles; and distinguishing the radiation signals of the gamma ray and the alpha particles in the output signals based on the distribution diagram, and obtaining an energy spectrum measurement value gamma[measurement] of the gamma ray and an energy spectrum measurement value alpha[measurement] of the alpha particles. The method can simply and effectively distinguish the radiation signals of the gamma ray and the alpha particles in the output characteristic quantity signals.

Description

technical field [0001] The present invention relates to the technical fields of radiation detection, environmental monitoring, and sample measuring equipment, in particular, to a method for screening and processing the output signal of a lanthanum bromide gamma spectrometer and its application, more specifically, to a lanthanum bromide gamma spectrometer The method for screening and processing the output signal of the lanthanum bromide gamma spectrometer, the method for energy calibration of the lanthanum bromide gamma spectrometer and the self-calibration low background lanthanum bromide gamma spectrometer. Background technique [0002] Lanthanum bromide has excellent time resolution (hundreds of picoseconds) and energy resolution (<3% for 662keV gamma rays), where its energy resolution is the best achieved by current scintillator detector types. Due to the high Z of lanthanum bromide (the effective atomic weight of 46.9 is similar to that of sodium iodide 50) and high d...

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Problems solved by technology

[0005] Due to the inherent radioactive background of the lanthanum bromide spectrometer, although it has the advantages of high energy resolution and high detection efficiency, its application has not been widely developed; and limited by the application scale, the production scale of lanthanum bromide crystals has been Underexpanded, resulting in expensive lanthanum bromide crystals, which in turn poses a price barrier to widespread adoption of lanthanum bromide detectors

but 138 La is a constituent element of lanthanum bromide crystals, and cannot be separated except by isotope separation 138 La is separated from ordinary lanthanum bromide compounds; and with the maturity of the purification process, the content of impurities such as actinides can be further reduced, but 227 The influence of Ac can only be limited, but it cannot be eradicated

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