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Your search keyword '"Zhongbin Teng"' showing total 3 results
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3 results on '"Zhongbin Teng"'

1. Simulation Research on Very-Low-Level γ Ray Radiation Field Scattering Radiation

Author

Xuan GENG, Zhongbin TENG, Zhongbin HANG, Qiao LI, Minghan JIA, Kaixuan HU, Mingzhe SONG, and Yuntao LIU

Subjects
underground laboratory, low-background, reference radiation, scattering radiation, monte-carlo method, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

In order to build a very-low-level γ ray radiation field and its magnitude transfer system，the scattering contribution caused by different mechanical device structure is researched based on the experimental conditions of the Jinping underground laboratory in China. In this research，the Monte Carlo model of the irradiation device，the magnitude transfer detector，and the internal transmission structure of the shielding box were built in the MCNP5 software. After that，the scattering contribution caused by three spatial variables: the emission angle of the irradiation device，the distance between the detector and the edge of the shielding box，and the distance between the source and the detector，was simulated，and the appropriate device design and layout scheme were obtained. The emission angle of 20°，30° and 40° were used in this research. The energy deposition in sensitive area (with/without the shielding box) was recorded under three different distances between the source and the detector. Three locations of the irradiation device were designed to analyze the change of energy deposition caused by the change of locations. The energy deposition in sensitive area was simulated under more distances between the source and the detector. According to the data，the increase in energy deposition with the emission angle of 20° is less than that caused by the emission angle of 30° and 40°，and the increase in energy deposition is less when the irradiation device is far from the edge of the shielding box. In this research，energy deposition caused by scattering radiation under various irradiation conditions were obtained and analyzed，the device design and layout in the radiation field were optimized，and the idea for establishing an extremely-low-background radiation field was provided.

Published
2024
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2. A NEW DOSE DETERMINATION METHOD FOR HP(3) AND DP LENS FOR BETA REFERENCE RADIATION QUALITIES

Author

Zhongbin Teng, Mingzhe Song, Senlin Liu, Nin Ni, Kexin Wei, Yuntao Liu, Zhongbin Hang, Xuan Geng, Kaixuan Hu, Qiao Li, Minghan Jia, and Dehong Li

Subjects
Radiation, Radiological and Ultrasound Technology, Public Health, Environmental and Occupational Health, Radiology, Nuclear Medicine and imaging, General Medicine
Abstract

For the purpose of obtaining the smaller uncertainties for Hp(3) and Dp lens in 90Sr/90Y beta reference fields, a new dose determination method based on the Monte-Carlo simulation was proposed. The conversion coefficients from the absorbed dose in air, at the reference point of the extrapolation ionisation chamber, Dair, det to Hp(3; α) and the conversion factors from Dair, det to Dp lens(α) were calculated with EGSnrc, respectively, for the irradiation angles from 0° to 60°. Compared with the dose determination method in International Organization for Standardization (ISO) 6980 standard, the uncertainty reductions of 7.7–52.8% for Hp(3; α) and 7.9–55.0% for Dp lens(α) were achieved, respectively. In addition, for the conversion coefficients from the reference absorbed dose DR to Hp(3; α), the calculations were performed for more irradiation conditions, which are not included in the current ISO 6980 standard. For the calculations of the conversion factors from DR to Dp lens(α), the eye and head phantoms with Chinese characteristics were utilised, which makes the conversion factors more suitable for use in China.

Published
2023
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3. CALCULATION OF THE DOSE CONVERSION COEFFICIENTS FOR CHINESE EYE LENS UNDER PHOTON EXPOSURE

Author

Zhongbin Teng, Mingzhe Song, Senlin Liu, Kexin Wei, and Yuntao Liu

Subjects
Adult, China, Photons, Radiation, Radiological and Ultrasound Technology, Phantoms, Imaging, Public Health, Environmental and Occupational Health, General Medicine, Radiation Dosage, Radiation Protection, Lens, Crystalline, Humans, Computer Simulation, Radiology, Nuclear Medicine and imaging, Monte Carlo Method
Abstract

In this work, the conversion coefficients from air kerma to the eye lens dose were calculated for photon exposures using the detailed eye and head Monte-Carlo (MC) model with the Chinese adult parameters. To verify the MC model and the simulation method, the conversion coefficients from fluence to the eye lens dose for mono-energy electrons (0.7–12 MeV) were calculated and compared with other studies. Then the conversion coefficients from air kerma to the doses in the entire lens and in the sensitive volume were calculated, respectively, for mono-energy photons (0.01–50 MeV) at different incidence angles (0–90°, in step of 15°). A small difference was found between the calculated conversion coefficient and the ICRP recommended value. The difference could be mainly due to the difference in their geometry characteristic of the eye and head models. In addition, the uncertainty analysis of the calculated conversion coefficients was performed in detail. The calculated dose conversion coefficient of the eye lens can be used to evaluate the eye lens dose for Chinese occupational staffs in external photon fields. And it can be used to determine the personal absorbed dose in the eye lens Dp lens in photon reference radiation fields.

Published
2021
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