Iranian Journal of Physics Research

Calibration of a Gamma ray dosimeter: A new method based on spectrometry in laboratory conditions

Document Type : Original Article

Authors

Faezeh Rahmani
Mohammad Nouri

Department of Physics, K.N. Toosi University of Technology

https://doi.org/10.47176/ijpr.26.2.12266
Abstract
Today, online gamma-ray dosimetry is one of the most widely used approaches for radiation dose measurement. One of the most comprehensive dosimetry methods is the direct conversion of the recorded gamma-ray energy spectrum into dose, or, in other words, the conversion of a spectrometer into a dosimeter. Among the numerous methods for converting a spectrometer into a dosimeter, the G(E) function method is considered one of the most suitable and accurate methods due to its use of energy-dependent conversion coefficients. In this study, the MCNP6 simulation code and a 2×2-inch NaI(Tl) spectrometer were used to calculate equivalent dose based on the recorded spectrum. Based on the equivalent-dose measurement conditions for a directional extended source, the novelty of this work is the development of a practical and efficient method for calibrating a point-source-based dosimeter in the laboratory, allowing valid equivalent-dose results to be obtained without the need to place the dosimeter in the radiation field of a directional extended calibration source.

Keywords

Dosimeter
Spectrometer
Ambient equivalent dose
G(E) function
MCNP6 simulation
Subjects
1.       R F Mould, Med. Phys. 21(12) (1994) 1997.   
2.       G Knoll, “Radiation detection and measurement”, John Wiley nSons, Ltd, New York (2011).
3.       J A Meli, “The Physics of Radiation Dosimetry”, AIP Publishing Books (2020).
4.       F H Attix, “Topics in Radiation Dosimetry”, Elsevier (2013).
5.       S Moriuchi, I  Miyanaga, Health phys. 12(4) (1966) 541.
6.       M Sommer, A Jahn, J Henniger, Radiat. Meas. 46(12) (2011) 1818.
7.       H Dombrowski, Radiat. Protec. Dos., 160(4) (2014) 269.
8.       R Casanovas, E Prieto, M Salvadó, Appl. Radiat. and Isotop. 118 (2016) 154.
9.       F H Attix, “Introduction to radiological physics and radiation dosimetry”, John Wiley & Sons (2008).
10.    W Yudong, L Xiaobing, Z Chi, Z Rong, Y Chaowen, J. Instrum. 13(6) (2018) 6004. 
11.    Y Y Ji, K H Chung, W Lee, D W Park, M , Kang, Radiat. Phys. and Chem. 97 (2014) 172
12.    C Y Yi, J S Jun, H S Chai, J J Oh, J Y Yun, Radiat. Protec. Dos. 74(4) (1997) 273.
13.    J S Jun, C Y Yi, H S Chai, H Cho, J. Kor, Phys. Soc. 28(6) (1995) 716

Home

Guide for Authors

Submit Manuscript

Reviewers

Contact Us

تحت نظارت وف بومی