A Measurement of the Residual Radioactivity with NaI Survey Meter and Its MC Simulation

WANG Qing-Bin; Kazuyoshi Masumoto; Hideo Hirayama; Tokushi Shibata

Chinese Physics C> 2007, Vol. 31> Issue(11) : 1071-1075

A Measurement of the Residual Radioactivity with NaI Survey Meter and Its MC Simulation

Institute of High Energy Physics, CAS, Beijing 100049, China2 Radiation Science Center, High Energy Accelerator Research Organization KEK, Japan

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Abstract：
The present study shows how Monte Carlo method using EGS4 code can be useful for evaluating the residual radioactivity induced in shielding concrete of accelerator facilities. By using EGS4 code, the response of NaI survey meter concerning the shielding concrete block radius and thickness are calculated. It is found that the surface dose rate is saturated when the shielding concrete radius and thickness reach 40cm and 30cm respectively. Under the above-mentioned conditions, the surface dose rates at position north-8 and south-9 of SF cyclotron in University of Tokyo, are investigated, and compared with the experimental results obtained by NaI survey meter. It is shown that the calculation results are in good agreement with the experiments. In addition, the conversion factor of the surface dose rate to urface residual radioactivity is obtained to be 0.90(Bq·g^－1)·(μSv·h^－1)^－1 for ⁶⁰Co and 1.26(Bq·g^－1)·(μSv·h^－1)^－1 for ¹⁵²Eu. By using this conversion factor, we can easily evaluate the radioactivity induced in shielding concrete of accelerator facilities from the experimental results of NaI survey meter.

References

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. SwansonWP. Radiological Safety Aspects of the Operation of Electron Linear Accelerators. Vienna: IAEA Technical Reports Series No.188, 19792. Phillips A B, Prull D E, Ristinen R A et al. J. Health Phys.,1986, 51: 337-3423. Urabe I, Kobayashi K. Health Phys., 1991, 60: 587-5914. Kimura K, Ishikawa T, Kinno M et al. Health Phys., 1994,67: 612-6315. Nelson W R, Hirayama H, Rogers D W O. The EGS4 Code System, SLAC-265. 19856. Kotegawa H et al. JAERI-M 93-020, 19937. Firestone R B, Shirley V S. Table of Isotopes (CD-ROM).Eighth Edition, Version 1.0. March 19968. Masumoto K, Toyota A, Eda K et al. Journal of Radioan-alytical and Nuclear Chemistry, 2003, 255: 465-469

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WANG Qing-Bin, Kazuyoshi Masumoto, Hideo Hirayama and Tokushi Shibata. A Measurement of the Residual Radioactivity with NaI Survey Meter and Its MC Simulation[J]. Chinese Physics C, 2007, 31(11): 1071-1075.

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Received: 2007-01-09
Revised: 2007-02-06

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沈阳化工大学材料科学与工程学院沈阳 110142

A Measurement of the Residual Radioactivity with NaI Survey Meter and Its MC Simulation

Corresponding author: WANG Qing-Bin,

Institute of High Energy Physics, CAS, Beijing 100049, China2 Radiation Science Center, High Energy Accelerator Research Organization KEK, Japan

Received Date: 2007-01-09
Accepted Date: 2007-02-06
Available Online: 2007-11-05

Abstract: The present study shows how Monte Carlo method using EGS4 code can be useful for evaluating the residual radioactivity induced in shielding concrete of accelerator facilities. By using EGS4 code, the response of NaI survey meter concerning the shielding concrete block radius and thickness are calculated. It is found that the surface dose rate is saturated when the shielding concrete radius and thickness reach 40cm and 30cm respectively. Under the above-mentioned conditions, the surface dose rates at position north-8 and south-9 of SF cyclotron in University of Tokyo, are investigated, and compared with the experimental results obtained by NaI survey meter. It is shown that the calculation results are in good agreement with the experiments. In addition, the conversion factor of the surface dose rate to urface residual radioactivity is obtained to be 0.90(Bq·g^－1)·(μSv·h^－1)^－1 for ⁶⁰Co and 1.26(Bq·g^－1)·(μSv·h^－1)^－1 for ¹⁵²Eu. By using this conversion factor, we can easily evaluate the radioactivity induced in shielding concrete of accelerator facilities from the experimental results of NaI survey meter.