Modified ferrous ammonium sulfate benzoic acid xyelenol orange (MFBX) and thermoluminescent dosimeters--a comparative study.
Radiation dosimetry deals with the determination of absorbed dose to the medium exposed to ionizing radiation. Chemical dosimetry depends on oxidation or reduction of chemicals by ionizing radiation. A ferrous ammonium sulfate benzoic acid xyelenol orange (FBX) dosimeter based on this principle is being used as a clinical dosimeter at present. Certain modifications were carried out in the preparation and storage of the FBX dosimeter to increase its shelf life. The resulting dosimeter was called a modified FBX (MFBX) dosimeter and has been used in our department for the past few years. An extensive study of the dose, dose rate and energy response of the dosimeter was carried out and compared with a thermoluminescent (LiF7) dosimeter. The results obtained were found to be comparable to the thermoluminescent (LiF7) dosimeter. Hence it was concluded that the MFBX dosimeter could be used for phantom dosimetry, data collection and in vivo measurements. Easier preparation and availability of the reagents are added advantages of using MFBX as a clinical dosimeter in small radiotherapy departments.
Department of Radiation Oncology, Christian Medical College Hospital, Vellore, Tamilnadu, India. brindha@cmcvellore.ac.in
S
S
Brindha
J V R
JV
Rose
S
S
Sathyan
Rabi Raja
RR
Singh I
B Paul
BP
Ravindran
D019817:Benzoic Acid / Q000737:chemistry*; D004307:Dose-Response Relationship, Radiation; D005296:Ferrous Compounds / Q000737:chemistry*; D005459:Fluorides / Q000494:pharmacology; D006358:Hot Temperature; D006801:Humans; D018020:Lithium Compounds / Q000494:pharmacology; D019047:Phantoms, Imaging; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods*; D011878:Radiotherapy / Q000379:methods; D013696:Temperature; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation* / Q000379:methods*
D005296:Ferrous Compounds; D018020:Lithium Compounds; D000644:Quaternary Ammonium Compounds; C027651:lithium fluoride; D019817:Benzoic Acid; C038178:ammonium ferrous sulfate; D005459:Fluorides