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KMID : 0364920130380010037
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Journal of Radiation Protection and Research
2013 Volume.38 No. 1 p.37 ~ p.43
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Neutron Dose Measurements Using TLDs in a 252Cf Neutron Field
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Jang In-Su
Kim Sang-In
Lee Jung-Il
Kim Jang-Lyurl
Kim Bong-Hwan
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Abstract
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In case of neutron dose measurement using TLDs (thermo- luminescence dosimeters), because the neutron energy dependence of the TLD is very high, the calibration of the energy response according to the characteristics of the neutron spectrum of workplace is required. In the present study, the ambient dose equivalent rates inside and around the Long-Counter (neutron detector) with narrow and complex inside in the neutron field of 252Cf were evaluated. The calibration factors to account for the neutron energy dependence of TLDs were established for both the bare and D2O modulated 252Cf neutron beams, respectively. The values of the TLD’s measurement were compared with the computational results of the MCNPX (Monte Carlo N-Particles transport code). When using the two calibration factors of the TLD than a single calibration factor, the measured and the calculated values at the point of verification outside and inside the Long-Counter were in more good agreement. This results show that TLD should be calibrated in the reference neutron field similar to workplace situation.
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KEYWORD
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TLD (Thermoluminescence Dosimeter), TL (Thermoluminescence), LiF, Neutron field, Neutron dose measurement
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