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Postal intercomparison of absorbed dose for high energy x rays with thermoluminescence dosimeters
Author(s) -
Bjärngard B. E.,
Kase K. R.,
Rudén B.I.,
Biggs P. J.,
Boyer A. L.,
Johansson K. A.
Publication year - 1980
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.594746
Subject(s) - dosimeter , dosimetry , thermoluminescent dosimeter , thermoluminescence , irradiation , absorbed dose , radiochemistry , nuclear medicine , materials science , thermoluminescent dosimetry , dose profile , medical physics , medicine , chemistry , physics , nuclear physics
This study concerns the accuracy and precision of the IAEA/WHO LiF TLD system used in intercomparison by mail of absorbed doses from 60 Co γ‐radiation and 4–25 MV x rays. The system employs 160 mg LiF powder in polystyrene capsules, which are placed at 5 or 7 cm depth in water and irradiated to doses close to 200 rad (2.00 Gy). The dosimeters are mailed to the IAEA Dosimetry Laboratory and read out under conditions to minimize variations in instrument sensitivity. The precision of the readout technique, using 3 capsules per irradiation and the readout of 5 aliquots per capsule, is characterized by 0.2% standard deviation of the resulting mean. Since random errors during the irradiation are added, the detectable systematic discrepancy in dose delivery, at the 95% confidence level, is ±2% for 60 Co γ and ±3% for high‐energy x rays.