PROPERTIES OF THERMOLUMINESCENT CaF2:Dy RODS FOR LOW-DOSE GAMMA RAY MEASUREMENTS

Authors
  1. Facey, R.A.
  2. Gravelle, R.A.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
Extruded rods of Dy-activated CaF2 were chosen as thermoluminescent (TL) gamma radiation detectors for an experiment in internal human phantom dosimetry. The requirement was for a small-volume dosimeter, with a wide but flat energy response, in the range of 1 mR to 1 R to measure gamma dose in the presence of neutrons. The report covers some of the TL properties of CaF2:Dy rods, including glow curve, sensitivity to gamma rays, linearity, and photon energy dependence. The measured response to fast neutrons was very small, but the response to thermal neutrons (and also resonance neutrons) was not negligible. Optical transfer effects were produced by UV in rods previously dosed to 1000 R. For use in phantom dosimetry, the energy dependence was corrected by a Pb-Sn-Cu shield. Fading, of 20% in the first week, was reduced effectively to zero by post-irradiation annealing. Cleaning of contaminated rods by H2SO4 etching is also described.
Report Number
682 — Technical Report
Date of publication
15 Aug 1973
Number of Pages
27
DSTKIM No
74-01449
CANDIS No
78178
Format(s):
Hardcopy;Originator's fiche received by DSIS

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