scholarly journals Measurement of radioactivity in an elevated radiation background area of Western Ghats

2014 ◽  
Vol 29 (2) ◽  
pp. 128-134 ◽  
Author(s):  
P.K. Manigandan ◽  
Chandar Shekar
Keyword(s):  
Dose Rate ◽  
Western Ghats ◽  
Activity Concentration ◽  
Gamma Dose ◽  
Gamma Dose Rate ◽  
Hazard Indices ◽  
Radiation Background ◽  
Naturally Occurring ◽  
Naturally Occurring Radionuclides ◽  
Background Area

As part of monitoring the exposure of the general public to natural radioactivity, the activity concentration of naturally occurring radionuclides in soil samples in an elevated radiation background area of Western Ghats was determined using gamma-ray spectrometry. Average values of the activity concentration of radionuclides, outdoor terrestrial gamma dose rate, annual effective dose equivalent and radiation hazard indices from soil activity were estimated. The activity concentrations of 232Th and average outdoor terrestrial gamma dose rate were found to be higher than the world average, possibly affecting the Western Ghats environment in general. Therefore, radiological risks to the general population from ionizing radiation from the naturally occurring radionuclides in the soil are considered to be significant. How- ever, other radiological hazard indices were found to be within permissible limits.

Activity Concentrations of Natural Radionuclides in Soils of Rainforest Sites in Western Ghats

2015 ◽  
Vol 2 (3) ◽  
pp. 103-108 ◽  
Author(s):  
P. K. Manigandan ◽  
K K Natrajan
Keyword(s):  
Western Ghats ◽  
Natural Radionuclides ◽  
Gamma Dose ◽  
Radiological Protection ◽  
Dose Rates ◽  
Naturally Occurring ◽  
Gamma Dose Rates ◽  
Activity Concentrations ◽  
Naturally Occurring Radionuclides ◽  
Radiological Hazard Indices

Assessments of naturally occurring radionuclides in soil collected from a tropical rainforest forest of western Ghats, India were conducted. These radionuclides were distributed unevenly in the forest soil. For all soil samples, the terrestrial gamma dose rate and the corresponding outdoor annual effective dose equivalents were evaluated. The activity concentration of 232Th and average outdoor gamma dose rates were found to be higher than the global average which appears to affects Western Ghats environment in general, the radiological hazard indices were found to be within the International Commission on Radiological Protection recommended limits. Hence, obtained results for natural radionuclides in the forest soils were within the range specified by UNSCEAR (2000) report for virgin soils except 232Th.

Terrestrial gamma dose rate, radioactivity and radiological hazards in the rocks of an elevated radiation background in Juban District, Ad Dali’ Governorate, Yemen

2016 ◽  
Vol 36 (1) ◽  
pp. 163-177 ◽  
Author(s):  
Wedad Ali Abdurabu ◽  
Ahmad Termizi Ramli ◽  
Muneer Aziz Saleh ◽  
Arien Heryansyah ◽  
Anees Alnhary ◽  
...  
Keyword(s):  
Dose Rate ◽  
Gamma Dose ◽  
Gamma Dose Rate ◽  
Radiation Background ◽  
Radiological Hazards

scholarly journals Environmental dose rate assessment from an active fault zone in Western Anatolia, Turkey: towards retrospective epidemiology

2014 ◽  
Vol 2 (1) ◽  
Author(s):  
Mithat Kiyak ◽  
George S. Polymeris ◽  
Nafiye G. Kiyak
Keyword(s):  
Dose Rate ◽  
Human Life ◽  
Epidemiological Studies ◽  
Gamma Dose ◽  
Gamma Dose Rate ◽  
Western Anatolia ◽  
Gamma Spectrometer ◽  
Radiation Background ◽  
Average Value ◽  
Active Tectonic

In this study we present data regarding natural radioactivity from a populated active tectonic area based on site measurements using a field gamma spectrometer. The results will provide data to the scientists for dating studies as well as epidemiological studies towards ancient human life, also termed as retrospective epidemiology. The study area covers an active tectonic region in western Anatolia surveyed using on-site gamma spectrometer. More than 500 sites were measured across the region on a 150- km grid. Radiation background shows relatively non-homogenous level of radiation in the area. The gamma dose rate measured in Gediz graben was found in the range between 0.8120- 1.7540 mGya–1 (94-203 nGyh–1) with an average value of 1.2292 mGy/a (142 nGyh–1), whereas it was in the range between 0.5530-1.1491 mGy/a (64-133 nGyh–1) with an average value of 0.8397 mGy/a (97 nGyh–1) across Buyuk Menderes graben. The relative contribution of 238U decay chain to gamma dose rate is between 0.2002- 0.4630 mGya–1, of 232Th decay series is 0.3089- 0.8136 mGya–1, and of 40K is 0.1270- 0.3468 mGya–1 in the whole studied area. The average annual effective dose equivalents from the calculated outdoor terrestrial gamma radiation was between 90-215 μSva–1, above world average of 70 μSv per year, and the measured outdoor dose rate (terrestrial plus cosmic) on the ground was between 133-257 μSva–1. The significance of all these numbers is discussed in the framework of epidemiological studies, in order to correlate these enhanced dose rate values directly to specific diseases such as cancer.

scholarly journals Inter-calibration of gamma dose rate detectors on the European scale

2009 ◽  
Vol 44 (5) ◽  
pp. 777-784 ◽  
Author(s):  
U. Stöhlker ◽  
M. Bleher ◽  
T. Szegvary ◽  
F. Conen
Keyword(s):  
Dose Rate ◽  
Gamma Dose ◽  
Gamma Dose Rate

scholarly journals Radioactive nuclides in phosphogypsum from the lowveld region of South Africa

2016 ◽  
Vol Volume 112 (Number 1/2) ◽  
Author(s):  
Xolani Msila ◽  
Frans Labuschagne ◽  
Werner Barnard ◽  
David G. Billing ◽  
◽  
...  
Keyword(s):  
South Africa ◽  
Concentration Index ◽  
Building Materials ◽  
Activity Concentration ◽  
Final Decision ◽  
Hazard Indices ◽  
Naturally Occurring ◽  
Radioactive Nuclides ◽  
Radium Equivalent ◽  
Activity Concentration Index

Abstract We evaluated the suitability of phosphogypsum from the Lowveld region of South Africa (LSA), for the manufacturing of building materials, with reference to (1) the National Nuclear Regulator Act 47 of 1999 and (2) the radioactivity associated risks as quantified in terms of the external and internal hazard indices, the activity concentration index and the radium equivalent. The distribution of radioactive nuclides in the LSA phosphogypsum was also examined. Analyses of 19 samples of the phosphogypsum show that phosphogypsum contains lower activity concentrations of naturally occurring radioactive nuclides of uranium and thorium and their progeny than the 500 Bg/kg limit set for regulation in South Africa. The potassium-40 (40K) activity concentration was below the minimum detectable amount of 100 Bq/kg. The values obtained for external and internal hazard indices and the activity concentration index were: 2.12 0.59, 3.44 0.64 and 2.65 0.76 respectively. The calculated radium equivalent Raeq was 513 76Bq/kg. The final decision regarding phosphogypsum’s suitability for use as a building material should consider scenarios of use.

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