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Response of the FBX system to a carbon beam: its potential as a dosimeter in heavy particle radiotherapy.

Physics in medicine and biology (2002-07-18)
M K Semwal, Milan Banerjee, Asiti Sarma, P B Vidyasagar
ABSTRACT

The FBX aqueous chemical dosimeter contains 0.2 mol m(-3) ferrous ammonium sulphate, 5.0 mol m(-3) benzoic acid and 0.20 mol m(-3) xylenol orange in 40.0 mol m(-3) sulphuric acid. The dosimeter can measure photon and electron doses in the range 0.1 to 3000 cGy in radiotherapy. The response of this dosimeter was measured for a 53.2 MeV carbon beam in the present work. Our initial result indicates that the sensitivity of the FBX system to the carbon beam as compared to cobalt-60 gamma rays is 25.5%, and thus we believe that the FBX system could be a useful dosimeter for carbon beams and similar heavy ions considered useful in radiotherapy.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Ammonium iron(II) sulfate hexahydrate, ACS reagent, 99%
Sigma-Aldrich
Ammonium iron(II) sulfate hexahydrate, 99.997% trace metals basis
Sigma-Aldrich
Ammonium iron(II) sulfate hexahydrate, ReagentPlus®, ≥98%
Sigma-Aldrich
Ammonium iron(II) sulfate hexahydrate, BioUltra, ≥99.0% (RT)
Sigma-Aldrich
Ammonium iron(II) sulfate hexahydrate, BioXtra, ≥98%