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Zhang X.,China Institute of Atomic Energy | Zhang X.,National Key Laboratory for Metrology and Calibration Techniques | Xing Y.,China Institute of Atomic Energy | Xing Y.,National Key Laboratory for Metrology and Calibration Techniques | And 2 more authors.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2016

In order to simplify the multiple measurements of temperature field in the experiment of absolute measurement of radon activity, the heat transfer process and temperature field distribution were simulated based on ANSYS. Through the input temperature simulation, the best condensation radius of radon source in theory was determined. The result shows that the thermal analysis result has directive function in choosing input temperature. © 2016, Editorial Board of Atomic Energy Science and Technology. All right reserved. Source

Xu L.,China Institute of Atomic Energy | Xu L.,National Key Laboratory for Metrology and Calibration Techniques | Ye H.,China Institute of Atomic Energy | Ye H.,National Key Laboratory for Metrology and Calibration Techniques | And 10 more authors.
He Jishu/Nuclear Techniques | Year: 2015

Background: Segmented Gamma Scanning (SGS) device for radioactive waste barrel has complex structure and many kinds of measurement objects different in their constitution, distribution, range of radioactivity, bulk density, etc. Purpose: If the device for each sample was individually scaled, usually multiple different compositions and cumbersome calibration sources were required, which would cost a lot of time and money. So a reference source with appropriate design is required at first. Methods: Based on the study of calibration methods and Monte Carlo (MC) calculations for waste drums scanning devices, the basic model of reference source for radioactive waste barrels was established. Results: Reference source is composed of a waste barrel rotating in measurement and a linear source which inserted in it and the same height as the barrel. It is the advantage that radioactive material is separated from filling matrix in the barrel and of flexible structure as well as high security. Conclusion: The experimental measurements and MC simulation results are in great agreement especially in high energy point above 344.3 keV. It proves that the reference source can be used in value transfer for SGS devices. ©, 2015, Science Press. All right reserved. Source

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