Premium
Response of LiF powder to 1 2 5 I photons
Author(s) -
Weaver Keith A.
Publication year - 1984
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 - 10.1118/1.595600
Subject(s) - dosimeter , dosimetry , ionization chamber , photon , radiochemistry , radiation , absorbed dose , materials science , irradiation , nuclear medicine , cobalt 60 , linear energy transfer , ion , physics , nuclear physics , optics , chemistry , ionization , medicine , quantum mechanics
1 2 5 I seeds are being used to treat a variety of diseases, including brain tumors. However, the uncertainty in the energy response of LiF for 1 2 5 I photons relative to megavoltage radiation limits the accuracy of dosimetry with this material. An array of 12 40‐mCi 1 2 5 I seeds was used to irradiate LiF powder in throwaway capsules, and an ion chamber was used to measure the absorbed dose. A comparison of the response of these LiF dosimeters with the response of capsules given a similar dose of 6 0 Co radiation has yielded values of 1.39±0.03 (dose to water) and 1.32±0.03 (dose to muscle) for the LiF response for 1 2 5 I relative to that for 6 0 Co. Details of the procedure and sources of uncertainty are discussed.