Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2019, Vol. 30 ›› Issue (9): 133 doi: 10.1007/s41365-019-0654-7

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Evaluation of the calibration factors of neutron dose rate meters in a 241Am–Be neutron field

Thiem Ngoc Le,1 Sy Minh Tuan Hoang,2 Quynh Ngoc Nguyen,1  Hoai-Nam Tran2   

  1. 1Institute for Nuclear Science and Technology, VINATOM, 179 Hoang Quoc Viet, Hanoi, Vietnam
    2Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh city, Vietnam
  • Received:2019-03-16 Revised:2019-04-15 Accepted:2019-05-09
  • Contact: Hoai-Nam Tran
  • Supported by:
    This work was supported by the Ministry of Science and Technology of Vietnam under Grant 07/HÐ/ÐTCB.
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Thiem Ngoc Le, Sy Minh Tuan Hoang, Quynh Ngoc Nguyen, Hoai-Nam Tran. Evaluation of the calibration factors of neutron dose rate meters in a 241Am–Be neutron field.Nuclear Science and Techniques, 2019, 30(9): 133     doi: 10.1007/s41365-019-0654-7

Abstract: Calibrations were performed for three types of neutron ambient dose equivalent rate meters, i.e., Aloka TPS- 451C (Hitachi), KSAR1U.06 (Baltic Scientific Instruments) and Model 12-4 (Ludlum), using a standard field of a 241Am-Be source. The measured total neutron ambient dose equivalent rates, H(10)0 tot, were analyzed to obtain the direct neutron ambient dose equivalent rates, H(10)0 dir, using the ISO 8529-2 recommended the generalized-fit method (GFM), semi-empirical fit method (SEM), and reduced-fitting method (RFM) fit methods. The calibration factor (CF), defined as the ratio between the conventional true value of the neutron ambient dose equivalent rates in a free field, H(10)0 FF, and H(10)0 dir, was evaluated as one of the important characteristics of the neutron meters in the present work. The fitting results show that the H(10)0 dir values of the meters are in good agreement within the theoretical data within 4%. The averaged CFs of the three neutron meters were evaluated as 0:99  0:01, 1:00  0:03 and 0:99  0:08, respectively. The largest standard uncertainty of these values was determined to be approximately 18.47% (k = 1). The standard uncertainty of the CFs obtained using the RFM method was less than 4.23% (k = 1), which is the smallest uncertainty among the three methods.

Key words: Neutron meter, Calibration factor, 241Am–Be source