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Assessment of impact of urbanisation on background radiation exposure and human health risk estimation in Kuala Lumpur, Malaysia.

Abstract：

:Kuala Lumpur has been undergoing rapid urbanisation process, mainly in infrastructure development. The opening of new township and residential in former tin mining areas, particularly in the heavy mineral- or tin-bearing alluvial soil in Kuala Lumpur, is a contentious subject in land-use regulation. Construction practices, i.e. reclamation and dredging in these areas are potential to enhance the radioactivity levels of soil and subsequently, increase the existing background gamma radiation levels. This situation is worsened with the utilisation of tin tailings as construction materials apart from unavoidable soil pollutions due to naturally occurring radioactive materials in construction materials, e.g. granitic aggregate, cement and red clay brick. This study was conducted to assess the urbanisation impacts on background gamma radiation in Kuala Lumpur. The study found that the mean value of measured dose rate was 251±6nGyh-1 (156-392nGyh-1) and 4 times higher than the world average value. High radioactivity levels of 238U (95±12Bqkg-1), 232Th (191±23Bqkg-1,) and 40K (727±130Bqkg-1) in soil were identified as the major source of high radiation exposure. Based on statistical ANOVA, t-test, and analyses of cumulative probability distribution, this study has statistically verified the dose enhancements in the background radiation. The effective dose was estimated to be 0.31±0.01mSvy-1 per man. The recommended ICRP reference level (1-20mSvy-1) is applicable to the involved existing exposure situation in this study. The estimated effective dose in this study is lower than the ICRP reference level and too low to cause deterministic radiation effects. Nevertheless based on estimations of lifetime radiation exposure risks, this study found that there was small probability for individual in Kuala Lumpur being diagnosed with cancer and dying of cancer.

journal_name

Environ Int

journal_title

Environment international

authors

Sanusi MSM,Ramli AT,Hassan WMSW,Lee MH,Izham A,Said MN,Wagiran H,Heryanshah A

doi

10.1016/j.envint.2017.01.009

subject

Has Abstract

pub_date

2017-07-01 00:00:00

pages

91-101

eissn

0160-4120

issn

1873-6750

pii

S0160-4120(16)30380-4

journal_volume

104

pub_type

杂志文章

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