Beijing Radiation Safety Technology Center

Beijing, China

Beijing Radiation Safety Technology Center

Beijing, China
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Sun S.,China Institute of Atomic Energy | Pan Z.,Hefei University of Technology | Li M.,Beijing Radiation Safety Technology Center | Zhou Y.,China Institute of Atomic Energy
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2017

Geant4 is a Monte Carlo simulation program toolkit based on C++ object-oriented technique. The toolkit can simulate various interactions between particles and medium materials and has been widely applied in high energy physics, accelerator physics, etc. However, because of the lack of critical source function, Geant4 cannot be used directly in reactor physics. Using physics models and particle tracking and control functions provided by Geant4, we implemented criticality calculation in two ways and developed Geant4-based static reactor simulation code G4-RSM and dynamic reactor simulation code G4-RDM. Both codes can be used for criticality simulation and the relative errors are within 5% compared with MCNP. Except for criticality simulation, G4-RDM can be used to simulate neutron characteristics in reactor accident conditions. © 2017, Editorial Office of High Power Laser and Particle Beams. All right reserved.


Wang L.,Beijing Radiation Safety Technology Center | Shang Z.,Beijing Radiation Safety Technology Center | Li F.,Beijing Radiation Safety Technology Center | Tong J.,Beijing Radiation Safety Technology Center
Dianbo Kexue Xuebao/Chinese Journal of Radio Science | Year: 2017

The conventional methods can not reflect the real influence of the short-wave antennas because a shortwave broadcast station usually has many electromagnetic sources, and the distribution of electric magnetic field (EMF) in the affected area is complicated. A method using unequal mesh-size measurement based on maximum relative error control is proposed. According to the EMF changes nearby shortwave broadcast station and the feasibility of environment, the mesh-size of measurement is determined by the magnitude of the EMF gradient, adopting a high sampling rate by using small grids and a low sampling rate by using bigger grids. This method decreases the workload and keeps the high measurement precision. Applications prove that this method can get good agreements between measurement and theoretical calculation. Copyright © 2017 by Editorial Department of Chinese Journal of Radio Science


Wang H.-P.,Beijing Radiation Safety Technology Center | Wang H.-P.,China Institute of Atomic Energy | Song F.-X.,Beijing Radiation Safety Technology Center | Li X.-Z.,Beijing Radiation Safety Technology Center | And 2 more authors.
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2014

The paper analyze the environmental surface gamma radiation dose rate rise in the process of rainfall, reference the research results about the influence of precipitation on the washout of aerosol particle in atmospheric sciences field, establish a model of the dose rate rising process, build the theoretical calculation equation. The results show that calculation curves can be better conform to actual measurement curve. By the theoretical derivation equation in this paper and the measured rainfall intensity data, the calculation to judge whether there is artificially radiation anomalies is provided.


Zhao G.-C.,Beijing Radiation Safety Technology Center | Wang Y.,Beijing Radiation Safety Technology Center
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2015

Measurements of the cumulative dose and instantaneous dose rate of indoor and outdoor environment respectively are done and the results are compared. The results indicate that the value of En for the cumulative dose and instantaneous dose rate of indoor is less than or equal to 1, so that the result is satisfactory; The relative deviation of cumulative dose rate and the instantaneous dose rate for Beijing environment in 2013 is less than 30%, so the comparison result is satisfactory too. This comparison, to some extent, verify the reliability of the measurement results based on two different principle for radiactive dose monitoring instruments, one for cumulative dose measurement system, the other for the instantaneous dose measurement instrument. ©, 2015, Atomic Energy Press. All right reserved.


Li X.-Z.,Beijing Radiation Safety Technology Center | Wang H.-P.,Beijing Radiation Safety Technology Center | Gu H.-K.,Beijing Radiation Safety Technology Center | Song F.-X.,Beijing Radiation Safety Technology Center | And 2 more authors.
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2013

The article presents a retrospect aiming at Beijing radiation emergency monitoring work (from 12 March to 22 May) after the Fukushima nuclear accident, analyses the character about this nuclear accident radionuclide discharge, introduces the monitoring objects and methods such as γ dose rate's continuous automatic monitoring, aerosol monitoring and soil monitoring and so on. The monitoring data is analyzed and the influence of the leakage is evaluated. The monitoring results indicate that the range of γ continuous dose rate is in the range of Beijing background radiation level, the radionuclides are 131I, 137Cs and 134Cs. Based on the aerosol data, considering the external exposure from airborne radionuclide and internal exposure from inhalation, assuming the three radionuclides exist at the same time, the effective dose to infants, youths and adults are all lower than one of a million of effective natural background dose.


Lu W.-W.,Finnish Center for Radiation and Nuclear Safety | Song F.-X.,Beijing Radiation Safety Technology Center | Zeng L.-P.,Beijing Radiation Safety Technology Center | Lv H.-N.,Beijing Radiation Safety Technology Center
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2012

In order to establish a quick and easy method to measure thorium-232 radioactivity concentration in the environmental soil, the powdered tablet sample preparation was used. The thorium quality content in environmental soil measured by energy dispersive fluorescence spectrometer, and converted into thorium-232 radioactive concentration, was compared with calculated radioactive concentration of thorium-232 measured by the high purity germanium gamma spectrometer. The relative deviation is between 6.12% and 29.46%. Paired t-test shows that the two sets of data are consistent. The precision and accuracy of the method are good. It demonstrates that the quick and easy method of fluorescence spectrometer can be used to analyze thorium-232 radioactive concentration in the soil.

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