# Siam Physics Congress 2015

May 20 – 22, 2015
Asia/Bangkok timezone
The Centennial Celebration of General Relativity Theory and 80 Years of Thai Physics Graduate

## Development and Dose Evaluation of Natural Topaz for Dosimeter Radiation

May 20, 2015, 2:00 PM
3h 30m
Board: NUC-08
Poster presentation Nuclear and Radiation Physics

### Speaker

Dr Ekachai Hoonnivathana (Department of Physics, Faculty of Science, Kasetsart University, Bangkok, Thailand)

### Description

In the present work, natural colourless topaz from Pakistan were irradiated gamma ray at different dose from 50-400 Gy. The samples were characterized by thermoluminescence (TL) and electron spin resonance (ESR) spectroscopy. The TL results showed that the luminescence center of topaz was appeared at 150 and 225 C. The intensity of TL was increased with increased radiation dose. The ESR signals with g = 1.966 and 2.012 due to Ti${}^{3+}$ and (AlO${}_4$)${}^-$ centers, respectively and increased with radiation dose. Percent error of evaluated dose from TL and ESR signals were 8 and 3, respectively. This study showed that the topaz can be used a radiation dosimeter.

### Primary author

Dr Ekachai Hoonnivathana (Department of Physics, Faculty of Science, Kasetsart University, Bangkok, Thailand)

### Co-authors

Dr Kittisakchai Naemchanthara (Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand) Ms Sirinapa Namno (Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand) Ms Vanlaya Vongsanit (Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand)