Investigation of the response characteristics of OSL albedo neutron dosimeters in a 241AmBe reference neutron field

International Nuclear Science and Technology Conference 2016

Liamsuwan, T.^1 ; Wonglee, S.^1 ; Channuie, J.^1 ; Esoa, J.^2 ; Monthonwattana, S.^2

Nuclear Research and Development Division, Thailand Institute of Nuclear Technology, Ongkharak, Nakorn Nayok, Thailand^1

Nuclear Technology Service Center, Thailand Institute of Nuclear Technology, Ongkharak, Nakorn Nayok, Thailand^2

关键词: Albedo neutron dosimeter;    Correction factors;    Linear relationships;    Lower limit of detections;    Neutron exposure;    Nuclear technology;    Optically stimulated luminescence;    Response characteristic;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/860/1/012021/pdf
DOI  :  10.1088/1742-6596/860/1/012021

来源: IOP

【 摘 要 】

The objective of this work was to systematically investigate the response characteristics of optically stimulated luminescence Albedo neutron (OSLN) dosimeters to ensure reliable personal dosimetry service provided by Thailand Institute of Nuclear Technology (TINT). Several batches of InLight® OSLN dosimeters were irradiated in a reference neutron field generated by the in-house241AmBe neutron irradiator. The OSL signals were typically measured 24 hours after irradiation using the InLight® Auto 200 Reader. Based on known values of delivered neutron dose equivalent, the reading correction factor to be used by the reader was evaluated. Subsequently, batch homogeneity, dose linearity, lower limit of detection and fading of the OSLN dosimeters were examined. Batch homogeneity was evaluated to be 0.12 ± 0.05. The neutron dose response exhibited a linear relationship (R2=0.9974) within the detectable neutron dose equivalent range under test (0.4-3 mSv). For this neutron field, the lower limit of detection was between 0.2 and 0.4 mSv. Over different post-irradiation storage times of up to 180 days, the readings fluctuated within ±5%. Personal dosimetry based on the investigated OSLN dosimeter is considered to be reliable under similar neutron exposure conditions, i.e. similar neutron energy spectra and dose equivalent values.