Calibration of CR-39 solid state nuclear track detector

Nowadays there are increasing uses of SSNTD on scientific works in Thailand. Currently we are using SSNTD as an important tool for confirming active fault zones in a province in which a new nuclear research reactor has been proposed to come up. Soil gas radon was measured by both active and passive methods. In the latter case CR-39 SSNTD was installed in a PVC tube of 50 cm long by 5 cm in diameter. The tubes were placed in 50-cm deep holes lining perpendicular to the faults’ trace for one week. In this paper we describe the method and the results on calibrating these detectors using a radon chamber and a NIST-traceable radium-226 standard source.Author Affiliation: P Wanabongse, B Sola, J Jamsangtong and S Rattanabussayaporn 1. Thailand Institute of Nuclear Technology, 16 Vibhavadi Rangsit Road, Chatuchak, Bangkok 10900, Thailand 2Department of Nuclear Technology, Chulalongkorn University, Payathai Road, Patoomwon Bangkok 10330, Thailand 3Office of Atoms for Peace, 16 Vibhavadi Rangsit Road, Chatuchak, Bangkok 10900, Thailand E-mail : [email protected] Institute of Nuclear Technology, 16 Vibhavadi Rangsit Road, Chatuchak, Bangkok 10900, Thailand 2Department of Nuclear Technology, Chulalongkorn University, Payathai Road, Patoomwon Bangkok 10330, Thailand 3Office of Atoms for Peace, 16 Vibhavadi Rangsit Road, Chatuchak, Bangkok 10900, Thailan

Current studies on radon gas in Thailand

6th International Conference on High Levels of Natural Radiation and Radon Area

Current studies on radon gas in Thailand

6th International Conference on High Levels of Natural Radiation and Radon Area

A pilot study for dose evaluation in high-level natural radiation areas of Yangjiang, China

A pilot study to measure ambient gamma dose rate and radon and thoron progeny concentrations was made for eight dwellings selected in Yangjiang, China. Indoor and outdoor ambient gamma dose rates were 110–370 and 100–220 nGy h-1, respectively. Doses received from indoor terrestrial radiation were estimated to be 0.6–1.8 mSv year-1. Radon, thoron and thoron progeny concentrations were 19–98, 18–1120 and 0.4–10.3 Bq m-3, respectively. This pilot study showed that the position of passive-type monitors to be placed and the deployment period should be carefully determined for estimating reliable annual average concentrations