Gamma radiation dosimetry using transmission and reflection spectroscopy of KCl_xBr_1-x as TL crystals

¹ Physics Department, Imam Hossein University, P.O. Box 16575, -347, Tehran, I.R. Iran
² Physics Department, Faculty of Basic Sciences, Tarbiat Modares University, P.O. Box 14115, -175, Tehran, I.R. Iran

Corresponding author: Malekfar@Modares.ac.ir

Received: 13 May 2009
Revised: 6 August 2009
Accepted: 11 December 2009
Published online: 16 February 2010

Abstract

In this article we have shown that it is possible to use transmission, absorption and reflection spectroscopic data of KCl_xBr_1-x single crystals for the TL (Thermo Luminescence) dosimetry purposes in the spectral range of 250-750 nm. The effects of gamma radiation on KCl_xBr_1-x single crystals were investigated by radiating the samples with a ⁶⁰Co source and studying the reflection and absorption spectra. Six doses of gamma radiation of 145, 300, 450, 600, 750 and 900 Gy were examined. The absorption peak height in the spectral region of 560-580 nm is in a direct relationship with the gamma radiation doses up to about 800 Gy, in which saturation starts to occur. The intensities of the color centers in mixed crystals are different by their combination ratios of the components contents. According to the reflection and transmission data, the absorption spectra can be calculated and a calibration curve sketched.