High-sensitivity radiation detector for low dose levels radiological applications

MAURO VALENTE; WLADIMIR MOLINA; JOSE VEDELAGO

Montevideo

Congreso; 10th Latin American Symposium on Nuclear Physics and Applications; 2013

CLAF Universidad de la Republica

Radiation dosimetry by Fricke gel was largely used, generally focused and optimized for radio-therapy applications therefore involving relative high dose levels. Fricke gel dosimetry has severaladvantages, like dose rate and LET almost independence, 3D mapping, among other. This workpresents a novel Fricke gel dosimeter optimized for low dose levels. Several chemical composi-tion were studied varying concentrations of sulfuric acid (H2 SO4 ), ferrous ammonium sulphate((NH4 )2 Fe(SO4 )2 · 6H2 O), benzoic acid (C7 H6 O2 ) and Xylenol orange (C31 H32 N2 O13 S). Sam-ples were analyzed by light transmission and absorbance. Sensitivity for low dose levels wassignificantly improved testing typical radiology setups. Comparisons with ionization chambershowed good agreement. Thus, remarking reliability of the developed system as promising toolfor low-level dosimetry