Continuous measurements of radiation levels along the west coast highway of Peninsular Malaysia

Tajuddin, A.A.; Hu, Shensen; Sakanoue, Masanobu

doi:10.1016/0969-8043(94)90193-7

Cited by 10 publications

(2 citation statements)

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“…Tajuddin et al in 1994 reported the natural radiation levels along the highway of Peninsular Malaysia by using NaI (Tl) scintillation detector (Tajuddin, Hu, & Sakanoue, 1994). The highest value of gamma dose rate was 1.5 mGy h À1 in Bukit Merah, whereas 150 nGy h À1 and 125 nGy h À1 were found in Penang and Kuala Lumpur, respectively.…”

Section: Summary Of the Resultsmentioning

confidence: 98%

An overview on measurements of natural radioactivity in Malaysia

Ahmad

Jaafar

Bakhash

et al. 2015

Journal of Radiation Research and Applied Sciences

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NaISoil Radioactivity a b s t r a c t Humans are always exposed during their lives to ionizing radiation arising outside and within the earth. The exposure to these radiation occurs from natural sources such as radioactive elements in rocks and soil, internal exposure form radioactive elements through water, food and air and cosmic rays entering from outer space to earth's atmosphere. About 87% of the radiation dose received by human beings is due to natural radiation, it is essential to assess the radiation doses in order to control possible health effects from such natural sources. In this regard, a number of articles have been appeared for Malaysia in international research journals, which have been reviewed and complied in this article. Most of these articles are about the measurement of activity concentrations of primordial ( 238 U, 232 Th, 226 Ra and 40 K) and anthropogenic ( 137 Cs) radionuclide's and gamma dose rate in environmental samples using HPGe and NaI (Tl) survey meter.

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Section: Summary Of the Resultsmentioning

confidence: 98%

An overview on measurements of natural radioactivity in Malaysia

Ahmad

Jaafar

Bakhash

et al. 2015

Journal of Radiation Research and Applied Sciences

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“…In Malaysia, information related to environmental terrestrial radiation is very limited. There are only a few relevant studies (Omar et al 1992, Tajuddin et al 1994, Ramli 1997).…”

Section: Introductionmentioning

confidence: 99%

Terrestrial gamma radiation dose study to determine the baseline for environmental radiological health practices in Melaka state, Malaysia

2005

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Environmental terrestrial gamma radiation dose rates were measured throughout Melaka, Malaysia, over a period of two years, with the objective of establishing baseline data on the background radiation level. Results obtained are shown in tabular, graphic and cartographic form. The values of terrestrial gamma radiation dose rate vary significantly over different soil types and for different underlying geological characteristics present in the study area. The values ranged from 54 +/- 5 to 378 +/- 38 nGy h(-1). The highest terrestrial gamma dose rates were measured over soil types of granitic origin and in areas with underlying geological characteristics of an acid intrusive (undifferentiated) type. An isodose map of terrestrial gamma dose rate in Melaka was drawn by using the GIS application 'Arc View'. This was based on data collected using a NaI(Tl) scintillation detector survey meter. The measurements were taken at 542 locations. Three small 'hot spots' were found where the dose rates were more than 350 nGy h(-1). The mean dose rates in the main population areas in the mukims (parishes) of Bukit Katil, Sungai Udang, Batu Berendam, Bukit Baru and Bandar Melaka were 154 +/- 15, 161 +/- 16, 160 +/- 16, 175 +/- 18 and 176 +/- 18 nGy h(-1), respectively. The population-weighted mean dose rate throughout Melaka state is 172 +/- 17 nGy h(-1). This is lower than the geographical mean dose rate of 183 +/- 54 nGy h(-1). The lower value arises from the fact that most of the population lives in the central area of the state where the lithology is dominated by sedimentary rocks consisting of shale, mudstone, phyllite, slate, hornfels, sandstone and schist of Devonian origin which have lower associated dose rates. The mean annual effective dose to the population from outdoor terrestrial gamma radiation was estimated to be 0.21 mSv. This value is higher than the world average of 0.07 mSv.

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