Affiliation:
1. Faculty of Electronic Engineering, Applied Physics Laboratory (APL), Niš
Abstract
An experimental study has been conducted to evaluate the feasibility of a
current mode gamma radiation dosimeter, consisting of a commercial PIN
photodiode as a radiation sensor, and a custom made auto-ranging electrometer
for real-time measurement of the PIN photodiode?s response under radiation
exposure. The radiation induced direct current response for single PIN
photodiodes with different active areas, as well as for multiple PIN
photodiodes connected in parallel, has been investigated. Three types of
commercial silicon PIN photodiodes have been chosen for evaluation - S1223,
BPW34, and PS100-6-CER2 PIN. During the experiment, five samples have been
tested - three samples made of single PIN photodiodes (one sample of each
photodiode type) and two samples formed by connecting multiple photodiodes in
parallel (two BPW34 photodiodes in parallel and four BPW34 photodiodes in
parallel). The samples have been irradiated with a 60Co gamma ray source and
the relations between the induced photocurrent and the dose rate, and between
the accumulated charge and the absorbed dose, have been determined. For
measuring the photodiodes response, a custom made auto-ranging electrometer
controlled by a personal computer, and capable of measuring direct currents
from 50 pA to 10 mA with relative error less than 2.5%, has been used.
Obtained results have shown very good linearity between the dose rate and the
induced photocurrent for dose rates ranging from 0.93 Gy/h to 67 Gy/h. Also,
very good linearity has been observed between the accumulated charge and the
absorbed dose for all tested samples, within the investigated range of
absorbed doses from 472 mGy to 3.3 Gy. On the basis of the obtained results,
a simple model has been derived, enabling the estimation of the photodiode?s
current response as a function of the dose rate and the photodiode?s geometry
(active area and depletion layer width).
Funder
Ministry of Education, Science and Technological Development of the Republic of Serbia
Publisher
National Library of Serbia
Subject
Safety, Risk, Reliability and Quality,Nuclear Energy and Engineering
Cited by
25 articles.
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