Inlaying source device used for scintillation crystal detector gain automatic control

Abstract

The invention relates to an inlaying source device used for scintillation crystal detector gain automatic control. The inlaying source device comprises a plastic scintillator barrel, a plastic scintillator cylinder and an epoxy resin layer. A 241Am radioactive source is adhered on the bottom part of the plastic scintillator barrel. The plastic scintillator cylinder is plugged in the plastic scintillator barrel and abutted against the 241Am radioactive source so that a plastic scintillator is formed. A reflective coating layer is arranged at the external side of the plastic scintillator. The epoxy resin layer is connected on the top part of the plastic scintillator cylinder in a sealing way and used for sealing the 241Am radioactive source in the plastic scintillator. According to the inlaying source device used for scintillation crystal detector gain automatic control, the manufacturing process of the 241Am radioactive source is simple and easy to realize; and light collection efficiency is high so that signal-to-noise ratio is effectively enhanced and detection efficiency of alpha particles is greatly enhanced.

Description

technical field [0001] The invention relates to a mosaic source device, in particular to a mosaic source device used for automatic gain control of a scintillation crystal detector. Background technique [0002] The energy response of commonly used NaI or CsI crystal detectors may be affected by environmental magnetic field, temperature and other factors. The relevant effects are detailed as follows: [0003] 1) As the geomagnetic field changes, the gain of the photomultiplier tube (PMT) of the scintillation detector will be affected by the slowly changing geomagnetic field. [0004] 2) After the photomultiplier tube works for a long time and the aging of the electronic circuit may cause the change of the system gain. [0005] 3) After the external working temperature changes, the luminous efficiency and electronic system gain of NaI or CsI crystals may also change, resulting in a linear change in energy. [0006] 4) The fluctuation of PMT high voltage will also cause the f...

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Problems solved by technology

[0004] 2) After the photomultiplier tube works for a long time and the aging of the electronic circuit may cause the change of the system gain

[0005] 3) After the external working temperature changes, the luminous efficiency and electronic system gain of NaI or CsI crystals may also change, resulting in a linear change in energy

[0006] 4) The fluctuation of PMT high voltage will also cause the fluctuation of detector gain

[0008] for automatic gain control 241 There are two main ways of Am mosaic source, one is to melt the plastic scintillator with 241 After the Am solution is evenly mixed, the plastic scintillator is solidified to obtain a uniformly distributed mosaic source, but this solution is difficult to manufacture, and it is necessary to ensure that the performance of the plastic scintillator does not change much after melting and curing; another way is to 241 Am is plated on the metal surface, and then the plastic scintillator is bonded to the metal surface to realize the sealing of the radioactive source. This scheme is easy to make but 241 Am's α particle detection solid angle is less than 2π, resulting in low detection efficiency

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