Cover Image

Assessment of natural radioactivity levels in rocks and their relationships with the geological structure of Johor state, Malaysia

The distribution of natural radionuclides (238U, 232Th and 40K) and their radiological hazard effect in rocks collected from the state of Johor, Malaysia were determined by gamma spectroscopy using a high-purity germanium detector. The highest values of 238U, 232Th and 40K activity concentrations (6...

Full description

Saved in:
Bibliographic Details
Main Authors: Alnour, Ibrahim Alfadil, Wagiran, Husin, Ibrahim, Noorddin, Hamzah, Suhaimi, Elias, Md. Suhaimi, Laili, Zalina, Omar, Muhamat
Format: Article
Published: Oxford University Press 2014
Subjects:
Q Science
Online Access:http://eprints.utm.my/id/eprint/51943/
http://dx.doi.org/10.1093/rpd/nct206
Tags: Add Tag
No Tags, Be the first to tag this record!
id my.utm.51943
record_format eprints
spelling my.utm.519432018-11-09T08:30:50Z http://eprints.utm.my/id/eprint/51943/ Assessment of natural radioactivity levels in rocks and their relationships with the geological structure of Johor state, Malaysia Alnour, Ibrahim Alfadil Wagiran, Husin Ibrahim, Noorddin Hamzah, Suhaimi Elias, Md. Suhaimi Laili, Zalina Omar, Muhamat Q Science The distribution of natural radionuclides (238U, 232Th and 40K) and their radiological hazard effect in rocks collected from the state of Johor, Malaysia were determined by gamma spectroscopy using a high-purity germanium detector. The highest values of 238U, 232Th and 40K activity concentrations (67±6, 85±7 and 722±18 Bg kg-1, respectively) were observed in the granite rock. The lowest concentrations of 238U, 232Th (2±0.1 Bq kg-1 for 238 and 2±0.1 Bq kg-1 for 232Th) were observed in gabbro rock. The lowest concentration of 40K (45±2 Bq kg-1) was detected in sandstone. The radium equivalent activity concentrations for all rock samples investigated were lower than the internationally accepted value of 370 Bq kg-1. The highest value of radium equivalent in the present study (239±17 Bq kg-1) was recorded in the area of granite belonging to an acid intrusive rock geological structure. The absorbed dose rate was found to range from 4 to 112 nGy h-1. The effective dose ranged from 5 to 138 μSv h-1. The internal and external hazard index values were given in results lower than unity. The purpose of this study is to provide information related to radioactivity background levels and the effects of radiation on residents in the study area under investigation. Moreover, the relationships between the radioactivity levels in the rocks within the geological structure of the studied area are discussed. Oxford University Press 2014 Article PeerReviewed Alnour, Ibrahim Alfadil and Wagiran, Husin and Ibrahim, Noorddin and Hamzah, Suhaimi and Elias, Md. Suhaimi and Laili, Zalina and Omar, Muhamat (2014) Assessment of natural radioactivity levels in rocks and their relationships with the geological structure of Johor state, Malaysia. Radiation Protection Dosimetry, 158 (2). pp. 201-207. ISSN 0144-8420 http://dx.doi.org/10.1093/rpd/nct206 DOI: 10.1093/rpd/nct206
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic Q Science
spellingShingle Q Science
Alnour, Ibrahim Alfadil
Wagiran, Husin
Ibrahim, Noorddin
Hamzah, Suhaimi
Elias, Md. Suhaimi
Laili, Zalina
Omar, Muhamat
Assessment of natural radioactivity levels in rocks and their relationships with the geological structure of Johor state, Malaysia
description The distribution of natural radionuclides (238U, 232Th and 40K) and their radiological hazard effect in rocks collected from the state of Johor, Malaysia were determined by gamma spectroscopy using a high-purity germanium detector. The highest values of 238U, 232Th and 40K activity concentrations (67±6, 85±7 and 722±18 Bg kg-1, respectively) were observed in the granite rock. The lowest concentrations of 238U, 232Th (2±0.1 Bq kg-1 for 238 and 2±0.1 Bq kg-1 for 232Th) were observed in gabbro rock. The lowest concentration of 40K (45±2 Bq kg-1) was detected in sandstone. The radium equivalent activity concentrations for all rock samples investigated were lower than the internationally accepted value of 370 Bq kg-1. The highest value of radium equivalent in the present study (239±17 Bq kg-1) was recorded in the area of granite belonging to an acid intrusive rock geological structure. The absorbed dose rate was found to range from 4 to 112 nGy h-1. The effective dose ranged from 5 to 138 μSv h-1. The internal and external hazard index values were given in results lower than unity. The purpose of this study is to provide information related to radioactivity background levels and the effects of radiation on residents in the study area under investigation. Moreover, the relationships between the radioactivity levels in the rocks within the geological structure of the studied area are discussed.
format Article
author Alnour, Ibrahim Alfadil
Wagiran, Husin
Ibrahim, Noorddin
Hamzah, Suhaimi
Elias, Md. Suhaimi
Laili, Zalina
Omar, Muhamat
author_facet Alnour, Ibrahim Alfadil
Wagiran, Husin
Ibrahim, Noorddin
Hamzah, Suhaimi
Elias, Md. Suhaimi
Laili, Zalina
Omar, Muhamat
author_sort Alnour, Ibrahim Alfadil
title Assessment of natural radioactivity levels in rocks and their relationships with the geological structure of Johor state, Malaysia
title_short Assessment of natural radioactivity levels in rocks and their relationships with the geological structure of Johor state, Malaysia
title_full Assessment of natural radioactivity levels in rocks and their relationships with the geological structure of Johor state, Malaysia
title_fullStr Assessment of natural radioactivity levels in rocks and their relationships with the geological structure of Johor state, Malaysia
title_full_unstemmed Assessment of natural radioactivity levels in rocks and their relationships with the geological structure of Johor state, Malaysia
title_sort assessment of natural radioactivity levels in rocks and their relationships with the geological structure of johor state, malaysia
publisher Oxford University Press
publishDate 2014
url http://eprints.utm.my/id/eprint/51943/
http://dx.doi.org/10.1093/rpd/nct206
_version_ 1643653108117536768
score 13.211869

Similar Items