Terrestrial gamma radiation and its statistical relation with geological formation in the Mersing district, Johor, Malaysia

Abstract

An extensive survey was carried out for gamma dose rates (GDRs) in the Mersing district, Johor, Malaysia. The average value of GDR measured in the district was found to be 140 nGy h(-1), in the range of 40-355 nGy h(-1). The mean weighted dose rate to the population, annual effective dose equivalent, collective effective dose equivalent, lifetime cancer risk were 0.836 mSv y(-1), 0.171 mSv, 1.18 × 10(1) man Sv y(-1) and 6.98 × 10(-4) Sv y, respectively. An isodose map was produced for the district. One way analysis of variance was used to test for differences due to different geological formations present in the Mersing District.

Terrestrial gamma radiation dose measurement and health hazard along river Alaknanda and Ganges in India

“…Therefore, it is important to measure the dose rates at different geological areas (Martin & Harbinson, 1972). In the past years, several radiation surveys were carried out in many countries to measure outdoor terrestrial g radiation doses (Brígido, Caballero, Montalv an Estrada, Queipo García, S anchez, 1999;Gabdo, Ramli, Sanusi, Saleh, & Garba, 2014;Kapdan, Taskin, Kam, & Osmanlio glu, 2012;Morishima et al, 2000;Mustapha et al, 2013;Nizam, Ginnah, Rahman, Kamal, & Chowdhury, 2013;Otansev, Karahan, Kam, Barut, & Taskin, 2012;Pashazadeh, Aghajani, Nabipour, & Assadi, 2014;Saleh et al, 2013;Shahbazi-Gahrouei, 2003). Many rivers in India and other countries have been studied such as river Pannoiyar (Ramasamy, Suresh, Meenakshisundaram, & Gajendran, 2009), Palar (Ramasamy, Murugesan, & Mullainathan, 2006),Cauvery (Murugesan, Mullainathan, Ramasamy, & Meenakshisundaram, 2011;Ramasamy, Murugesan, & Mullainathan, 2004), Kali, Sharavathi, Netravathi (Narayana, Rajashekara, & Siddappa, 2007) and Godavari (Reddy, Reddy, Reddy, & Reddy, 2014) in India and Chao Phraya river in Thailand (Santawamaitre et al, 2011), Ribble Estuary in England (Punt, Tyler, Saleh, Bradley, & Copplestone, 2011) Ogun river in Nigeria (Jibiri & Okeyode, 2012) and river Pearl in China (Song, Chen, Tang, Zhang, & Xie, 2012).…”

Prediction of terrestrial gamma dose rate based on geological formations and soil types in the Johor State, Malaysia

“…This soil type is found in the Northern areas and smaller areas in the South and covered 1.2% of the Johor state (Saleh et al, 2013a). …”

“…The readings were taken until they stabilised (Ramli, 1997;Saleh et al, 2013a). At least two measurements were taken around the measuring point using each of the two detectors.…”

Measurements of natural radioactivity in soil of Fraser’s Hill, Pahang, Malaysia

“…It was found that the lithology of the sampling locations is of acid intrusive type. Soils formed from acid intrusives has higher radioactivity compared to other rock types [7,23,24]. Studies done in Pahang have shown that acid intrusives geology has high concentration of …”