Thermoluminescent Response of Thin LiF:Mg,Cu,Na,Si Detectors to Beta Radiation

얇은 LiF:Mg,Cu,Na,Si 검출기의 베타선장에 대한 TL 반응

  • Nam, Y.M. (Health Physics Dept. Korea Atomic Energy Research Institute) ;
  • Kim, J.L. (Health Physics Dept. Korea Atomic Energy Research Institute) ;
  • Chang, S.Y. (Health Physics Dept. Korea Atomic Energy Research Institute) ;
  • Cho, H.W. (Dept. of Physics, Pusan National University) ;
  • Kim, H.J. (Dept. of Radiological Technology, Taejon Health Sciences College)
  • Published : 1999.03.30

Abstract

Thermoluminescent (TL) response characteristics of a thin LiF:Mg,Cu,Na,Si Teflon detectors have been studied for use in beta radiation detection. The detectors were fabricated from a mixture of LiF:Mg,Cu,Na,Si phosphor and Teflon powder which was molded into a thin disk form of $50mg/cm^2$ thickness. These detectors were irradiated to beta fields of $^{147}Pm,\;^{204}Tl\;and\;^{90}Sr/^{90}Y$ sources with a covering of Kapton foil ($2mg/cm^2$) and photon irradiation was carried out with a $^{137}Cs$ source at the Korea Atomic Energy Research Institute (KAERI). Batch uniformity was estimated to be 4.7% and the beta dose response presented linear relationship from 0.1 mGy to 100 Gy. The beta energy responses of thin detectors normalized to $^{137}Cs$ were presented as 0.46, 1.09 and 1.06 for $^{147}Pm,\;^{204}Tl\;and\;^{90}Sr/^{90}Y$ beta rays, respectively. The evaluated values for angular responses were $0.93{\pm}0.03\;(^{147}Pm),\;0.94{\pm}0.04\;(^{204}Tl),\;and\;0.92{\pm}0.05\;(^{90}Sr/^{90}Y)$. The results satisfied well a proposed ISO Standard for beta ray dosimeters.