Calibration of UV-Radiation Dose with Irradiation Time for CR-39 Track Detector by Using UV-visible Spectrophotometer

Abstract

Nuclear track detector type CR-39 irradiated by two UV-irradiation methods at wavelength 254nm . First method was PEN-ray-lamp UV-irradiation with the distance 4cm between UV source to CR-39 detector and the range of irradiation time - TD were 10,100 and 1000 s . Second method was FLX-20 transiluminator 15W energy amount with the distance 10 cm between UV source to CR-39 detector and therange of irradiation dose - DT were 2 , 6 , 9 and 10J/cm2. The absorbance-A was determine from UV-visible spectroscopy at the measuring range from 300 – 500 nm for each method .The absorbance differences [ΔA]350 and [ΔA]550 for irradiated and un-irradiated CR-39 detector were measured between absorbance value at wavelength 350nm and 550nm respectively . In this study determined the linear relationship between the increasing of TD(s) and DT(J/cm2) with increasing of [ΔA]350 and [ΔA]550 .This work obtained that FLX-20transiluminator ( second method) was used as a calibration route to PEN-ray-lamp ( first method) after measuring the absorbance deference [ΔA]350 and [ΔA] 550 for CR-39 detector.