USE OF THE FBX DOSIMETER FOR THE QUALITY ASSURANCE OF CO-60 AND HIGH-ENERGY TELETHERAPY MACHINES BY MAIL

The concentrations of the solutes in the standard FBX dosimeter were changed in order to reduce the rate of thermal oxidation of ferrous ions in the solution. The modified solution contained 10(-4) mol dm-3 ferrous ions, 10(-3) mol dm-3 benzoic acid and 5 x 10(-5) mol dm-3 xylenol orange in 0.04 mol...

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Bibliographic Details
Published in:Physics in medicine & biology 1992-11, Vol.37 (11), p.2095-2102
Main Authors: GUPTA, BL, NARAYAN, GR, BHAT, RM, KINI, UR, RAMASWAMY, RS, SUSEELA, B
Format: Article
Language:English
Subjects:
Engineering
Engineering, Biomedical
Life Sciences & Biomedicine
Radiology, Nuclear Medicine & Medical Imaging
Science & Technology
Technology
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Summary:The concentrations of the solutes in the standard FBX dosimeter were changed in order to reduce the rate of thermal oxidation of ferrous ions in the solution. The modified solution contained 10(-4) mol dm-3 ferrous ions, 10(-3) mol dm-3 benzoic acid and 5 x 10(-5) mol dm-3 xylenol orange in 0.04 mol dm-3 aqueous aerated sulphuric acid. The rates of thermal oxidation of ferrous ions do not differ significantly when the solution is stored either in glass or polypropylene containers. The error due to the post-irradiation delay in dose estimation depends on the dose and a dose of about 5 Gy is most suitable. When the solution is stored up to about one month before irradiation and about one month after irradiation, the error in dose estimation is less than +/-2%. The blank and the irradiated solutions should be stored in similar containers.
ISSN:0031-9155
DOI:10.1088/0031-9155/37/11/006