DOI QR코드

DOI QR Code

Neutron Dose Measurements Using TLDs in a 252Cf Neutron Field

252Cf 중성자장에서 열형광선량계(TLD)를 이용한 중성자 방사선량 측정

  • Chang, Insu (Health Physics Department, Korea Atomic Energy Research Institute) ;
  • Kim, Sang In (Health Physics Department, Korea Atomic Energy Research Institute) ;
  • Lee, Jung Il (Health Physics Department, Korea Atomic Energy Research Institute) ;
  • Kim, Jang Lyurl (Health Physics Department, Korea Atomic Energy Research Institute) ;
  • Kim, Bong Hwan (Health Physics Department, Korea Atomic Energy Research Institute)
  • 장인수 (한국원자력연구원 방사선방호팀) ;
  • 김상인 (한국원자력연구원 방사선방호팀) ;
  • 이정일 (한국원자력연구원 방사선방호팀) ;
  • 김장렬 (한국원자력연구원 방사선방호팀) ;
  • 김봉환 (한국원자력연구원 방사선방호팀)
  • Received : 2013.02.25
  • Accepted : 2013.03.15
  • Published : 2013.03.30

Abstract

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 $^{252}Cf$ were evaluated. The calibration factors to account for the neutron energy dependence of TLDs were established for both the bare and $D_2O$ modulated $^{252}Cf$ 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.

References

  1. Pelowitz DB. MCNPX user's manual, version 2.5.0. LA-CP-05-0369. Los Alamos National laboratory. 2005.
  2. Chen R, Kirsh Y. Analysis of Thermally Stimulated Processes. Pergamon Press, New York, 1981:32-54.
  3. Mariotti F, Uleri G, Fantuzzi E. Batch homogeneity of LiF(Mg,Cu,P)-GR200 and LiF(Mg,Cu,P)-MCP-NS TL detectors for use as extremity dosemeters at ENEA personal dosimetry service. Radiat. Prot. Dosim. 2006;120(1-4):283-288. https://doi.org/10.1093/rpd/nci649
  4. Delgado A, Gomez Ros JM, Furetta C, Bacci C. Isothermal Decay of Glow Peaks in LiF:Mg,Cu,P. Radiat. Prot. Dosim. 1993;47(1-4):49. https://doi.org/10.1093/oxfordjournals.rpd.a081700
  5. Horowitz YS, Ben Sharchar B. Thermoluminescent LiF:Mg,Cu,P for Gamma Ray Dosimetry in Mixed Fast Neutron-Gamma fields. Radiat. Prot. Dosim. 1988;23:401-405. https://doi.org/10.1093/oxfordjournals.rpd.a080206
  6. Wang SS, Gai GG, Zhou KQ, Zhou RX. Thermoluminescent response of $^{6}LiF$(Mg,Cu,P) and $^{7}LiF$(Mg,Cu,P) TL chips in neutron and gamma ray mixed radiation fields. Radiat. Prot. Dosim. 1990;33:247-250. https://doi.org/10.1093/oxfordjournals.rpd.a080802
  7. Bakhsi AK, Dhabekar BS, Chatterjee S, Joshi VJ, Kher RK. Energy response study of thermoluminescent dosimeters to synchrotron radiation in the energy range 10-35 keV. Indian J. Eng. Mater. S. 2009;16:172-174.
  8. Davis SD, Ross CK, Mobit PN, Van der Zwan L. Chase WJ, Shortt KR. The response of LiF thermoluminescence dosimeters to photon beams in the energy range from 30 kV x-rays to $^{60}Co$ gamma rays. Radiat. Prot. Dosim. 2003;106:33-43. https://doi.org/10.1093/oxfordjournals.rpd.a006332
  9. International Commission on Radiation Unit and Measurement. Conversion Coefficients for use in Radiological Protection against External Radiation. ICRU report 57. 1998.
  10. Reginatto M, Wiegel B, Zimbal A. The "fewchannel" unfolding programs in the UMG package: MXD_FC31 and IQU_FC31, and GRV_FC31, version 3.1. Physikalisch-Technische Bundesanstalt (PTB). 2002.