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Li Y.,Naval Institute of Nuclear and Chemical Safety | Yan X.-K.,Naval Institute of Nuclear and Chemical Safety | Liu M.-J.,Naval Institute of Nuclear and Chemical Safety | Zhang Y.,Naval Institute of Nuclear and Chemical Safety
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2013

A problem with NaI-photomultiplier based gamma detection has been spectrum shift resulted from changes of temperature. Spectrum stabilization method based on light emitting diode (LED) is of obvious preponderance, whose key-technique is to keep the output light of blue LED being constant. Different driving methods for blue LED have been researched by theoretical analysis and experimental testing, and experimental results show that driving circuit of constant current pulse has better performance to drive blue LED for spectrum stabilization. This is valid for the accomplishment of spectrum stabilization of NaI(Tl) spectrometer based on LED. Source


Liu C.-H.,Naval Institute of Nuclear and Chemical Safety | Zhang Y.,Naval Institute of Nuclear and Chemical Safety | Guo Q.-J.,Beijing University of Technology | Luo M.,Naval Institute of Nuclear and Chemical Safety | And 4 more authors.
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2012

Monodisperse aerosol generator is the necessary equipment when controlling the concentration and equilibrium factor of radon daughter in radon chamber. In order to achieve the control of the concentration of radon daughters and the pattern of behavior research which radon daughters attached to radioactive aerosol in radon chamber, this paper set up a condensation aerosol generator. The device consisits of aerosol condensation nuclei generator, saturator and reheating condensation device, and can happen out of pure NaCl nuclei, pure DEHS droplets and NaCl +DEHS mixed aerosol particles.Experiments showed that the good monodispersity of pure NaCl nuclei and NaCl +DEHS mixed aerosol particles can be kept, and pure DEHS droplets dispersed generally higher. Different types and different particle size distribution can be controlled by changing the overall gas flow, the concentration of NaCl solution, the amount of desiccant, the temperature of saturator, reheater temperature and the different branching ratio.The results may be in line with the basic theory of aerosol generator. Source

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