A novel approach towards development of real time chemical dosimetry using pulsating sensor-based instrumentation

Abstract

The paper presents an innovative approach towards development of real time dosimetry using a chemical dosimeter for measurement of absorbed radiation dose in the range between 1 and 400 Gy. Saturated chloroform solution in water, a well known chemical dosimeter, is used to demonstrate the concept of online measurement of radiation dose. The measurement approach involves online monitoring of increase in conductivity of saturated chloroform solution due to progressive build up of traces of highly conducting HCl during exposure to gamma irradiation. A high performance pulsating sensor-based conductivity monitoring instrument has been used to monitor such real time change in conductivity of solution. A relation between conductivity shift and radiation dose has been established using radiochemical yield value (G value) of HCl. The G value of HCl in saturated chloroform dosimeter has been determined using laboratory developed pulsating sensorbased devices. In this connection dose rate of Co-60 gamma chamber was determined using Fricke dosimeter following a simple potentiometric measurement approach developed inhouse besides conventional spectrophotometry. Results obtained from both measurement approaches agreed well. Complete instrumentation package has also been developed to measure real time radiation dose. The proposed real time radiation dosimeter is successfully tested in several measurement campaigns in order to assure its performance prior to its deployment in field.

Chemical dosimeters for electron beam dosimetry of microtron accelerator

“…In the present study the absorbed dose due to 8 MeV electron beam from microtron accelerator has been measured using the chemical dosimeters such as fricke, ferrous ammonium sulphate-benzoic acid-xylenol orange (FBX), alanine and glutamine. The Fricke dosimetry system is considered to be most reliable chemical dosimetry system, which is widely used for calibration of gamma and electron radiation [2][3][4]. Fricke dosimeter provides a reliable means for measurement of absorbed radiation dose based on the process of oxidation of ferrous ion (Fe 2? )…”