Natural background radiation in the Kinta District, Perak Malaysia

Measurement of natural background radiation levels in the Kinta District was carried out between 2003 and 2005. Gamma dose rates were measured from 1007 locations using a portable gamma-ray survey meter, Model 19 Micro R meter manufactured by Ludlum. The measured dose rates ranged from 39 to 1039 nG...

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Main Author:	Lee, Siak Kuan
Format:	Thesis
Language:	English
Published:	2007
Subjects:	QC Physics
Online Access:	http://eprints.utm.my/id/eprint/22740/1/LeeSiakKuanMFS2007.pdf
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spelling	my-utm-ep.227402018-08-03T08:49:25Z Natural background radiation in the Kinta District, Perak Malaysia 2007-11 Lee, Siak Kuan QC Physics Measurement of natural background radiation levels in the Kinta District was carried out between 2003 and 2005. Gamma dose rates were measured from 1007 locations using a portable gamma-ray survey meter, Model 19 Micro R meter manufactured by Ludlum. The measured dose rates ranged from 39 to 1039 nGy h-1 and have a mean dose rate of 222 ± 191 nGy h-1 (1.36 mSv y-1). Two small areas of hot spots around Kampung Sungai Durian with dose rates of 1039 nGy h-1 were found. This is the highest dose rate recorded in Perak to date. A total of 128 soil samples collected were analyzed for the activities of the naturally occurring radionuclides, gross alpha and gross beta activities. The activity concentrations of 238U, 232Th and 40K were analyzed by using a HPGe detector. The ranges are 12 – 426 Bq kg-1 for 238U, 19 – 1377 Bq kg-1 for 232Th and from less than 19 – 2204 Bq kg-1 for 40K. Based on the radioactivity levels determined, the gamma absorbed dose rates in air at 1 meter above the ground were calculated using the procedure applied by UNSCEAR 2000. The total calculated dose rates and measured dose rates have shown good correlation coefficient of 0.94. The calculated Radium Equivalent Activity (Raeq) range from 0.14 to 6.01 mSv y-1. The gross alpha activity of the soil samples range from 15 to 9634 Bq kg-1 with a mean value of 1558 ± 121 Bq kg-1. The gross beta activity range from 142 to 6173 Bq kg-1 with a mean value of 1112 ± 32 Bq kg-1. The mean population weighted dose rate for the Kinta district is 1.2 mSv y-1. Gamma isodose map for the Kinta District was plotted. The isodose map is the most recent and can be used as a reference. 2007-11 Thesis http://eprints.utm.my/id/eprint/22740/ http://eprints.utm.my/id/eprint/22740/1/LeeSiakKuanMFS2007.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:97283 masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QC Physics
spellingShingle	QC Physics Lee, Siak Kuan Natural background radiation in the Kinta District, Perak Malaysia
description	Measurement of natural background radiation levels in the Kinta District was carried out between 2003 and 2005. Gamma dose rates were measured from 1007 locations using a portable gamma-ray survey meter, Model 19 Micro R meter manufactured by Ludlum. The measured dose rates ranged from 39 to 1039 nGy h-1 and have a mean dose rate of 222 ± 191 nGy h-1 (1.36 mSv y-1). Two small areas of hot spots around Kampung Sungai Durian with dose rates of 1039 nGy h-1 were found. This is the highest dose rate recorded in Perak to date. A total of 128 soil samples collected were analyzed for the activities of the naturally occurring radionuclides, gross alpha and gross beta activities. The activity concentrations of 238U, 232Th and 40K were analyzed by using a HPGe detector. The ranges are 12 – 426 Bq kg-1 for 238U, 19 – 1377 Bq kg-1 for 232Th and from less than 19 – 2204 Bq kg-1 for 40K. Based on the radioactivity levels determined, the gamma absorbed dose rates in air at 1 meter above the ground were calculated using the procedure applied by UNSCEAR 2000. The total calculated dose rates and measured dose rates have shown good correlation coefficient of 0.94. The calculated Radium Equivalent Activity (Raeq) range from 0.14 to 6.01 mSv y-1. The gross alpha activity of the soil samples range from 15 to 9634 Bq kg-1 with a mean value of 1558 ± 121 Bq kg-1. The gross beta activity range from 142 to 6173 Bq kg-1 with a mean value of 1112 ± 32 Bq kg-1. The mean population weighted dose rate for the Kinta district is 1.2 mSv y-1. Gamma isodose map for the Kinta District was plotted. The isodose map is the most recent and can be used as a reference.
format	Thesis
qualification_level	Master's degree
author	Lee, Siak Kuan
author_facet	Lee, Siak Kuan
author_sort	Lee, Siak Kuan
title	Natural background radiation in the Kinta District, Perak Malaysia
title_short	Natural background radiation in the Kinta District, Perak Malaysia
title_full	Natural background radiation in the Kinta District, Perak Malaysia
title_fullStr	Natural background radiation in the Kinta District, Perak Malaysia
title_full_unstemmed	Natural background radiation in the Kinta District, Perak Malaysia
title_sort	natural background radiation in the kinta district, perak malaysia
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2007
url	http://eprints.utm.my/id/eprint/22740/1/LeeSiakKuanMFS2007.pdf
_version_	1747815425832386560

Natural background radiation in the Kinta District, Perak Malaysia

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