Development of a TL pellet based on $CaSO_4:Dy$ for Neutron Measurement

$CaSO_4:Dy$ 물질 기반 중성자 측정용 TL소자 개발

  • 양정선 (한국원자력연구소 방사선관리실) ;
  • 이정일 (한국원자력연구소 방사선관리실) ;
  • 김장렬 (한국원자력연구소 방사선관리실) ;
  • 김봉환 (한국원자력연구소 방사선관리실) ;
  • 소동섭 (한국원자력연구소 방사선관리실)
  • Published : 2006.09.30

Abstract

A TL pellet for a neutron dose measurement (KCT-306) by embedding a $^6Li$-compound into a $CaSO_4:Dy$ phohphor was developed based upon the technical information of KCT-300. The KCT-300 is an another kind of $CaSO_4:Dy$ TL detector shich was developed at KAERI, in which small amounts of $NH_4H_2PO_4$ have been emvedded as a binding material. This paper presented the optimized manufacturing condition of KCT-306 and compared its sensitivity with that of the commercialized neutron TL pellets. $CaSO_4:Dy$ Phosphor with grain size ranging less than $45{\mu}m$ are used for the KCT-306. The optimum $CaSO_4:Dy$ TL phosphor, $^6Li$-compounds and P-compound as the binding material are determined as 20-40wt%, 50-70wt% and 20wt%. The TL pellet combination of our KCT-306/KCT-300, TLD-600/TLD-700 and TLD-600H/TLD-700H(Harshaw) have been irradiated in the neutron/gamma mixed fields from a $D_2O$ moderated $^{252}Cf$ neutron source. The KCT-300, TLD-700 and TLD-700H were used at the same time as gamma ray discriminators in the neutron/gamma mixed fields. It was found that the neutron/gamma response ratios of KCT-306/KCT-300, which were developed in this study, were approximately 4 times higher than those of the commercial TLD-600H/TLD-700H.

References

  1. Mayhugh MR, Watanabe S and Muccillo R. Proc. Third Int. Conf. Lum. Dosimetry, Riso, Denmark. 1971;3:1040
  2. Morgan MD, Lacombe MA, and Stoebe TG. Development of a thermal neutron dosemeter utilizing the $CaSO_4$:Dy system. Radiat. Prot. Dosim. 1984;6(1-4):321-324
  3. Ayyangar K, Chandra B and Lakshmanan AR. Mixed field dosimetry with $CaSO_4$:Dy. Phys. Med.Biol. 1974;19(5):656-664 https://doi.org/10.1088/0031-9155/19/5/006
  4. Iga K, Yamashita T, Takenaga M, Yasuno Y, Oonishi H and Ikedo M. Composite TLD Based on $CaSO_4$:Tm for ${\gamma}$-rays, X-rays, ${\beta}$-rays and thermal neutron. Health physics Pergamon Press 1977;33:605-610 https://doi.org/10.1097/00004032-197712000-00011
  5. Takenaga M. Thermoluminescent Response to thermal neutrons of mixture of $CaSO_4$: Tm and non-luminous $^6LiF$. Journal of Nuclear Science and Technology 1977;14(4):292-299 https://doi.org/10.3327/jnst.14.292
  6. Beach JL, Huang CY. Mixed Field Dosimetry with $CaSO_4$(Tm)Li. Health physics, Pergamon Press 1976;31:452-455
  7. Yang JS et al. Developmen of Phosphors-compound $CaSO_4$:Dy (KCT-300) TL pellets. Journal of the Korean Nuclear Society. 2002;34(2):142-145
  8. 양정선, 김두영, 김장렬, 임길성, 장시영. $CaSO_4:Dy$ TL 물질에 Li 화합물을 첨가한 중성자 측정용 소자의 제작. 추계학술발표회논문집한국원자력학회 2003
  9. 양정선, 김두영, 김장렬, 이정일, 남영미, 장시영. Fabrication and TL Characteristics of $CaSO_4:Dy$ TL Powder. 한국원자력학회 춘계학술대회 2001
  10. Shinde SS and Shastry SS. Journal of Applied Radiation and Isotopes. 30:75-77