scholarly journals Natural Radioactivity in Some Building Materials Originating from a High Background Radiation Area

2014 ◽  
Vol 2 (6) ◽  
pp. 70-78
Author(s):  
Kinsara A.A ◽  
Shabana E.I ◽  
Qutub M.M.T
Keyword(s):  
Building Materials ◽  
Background Radiation ◽  
Natural Background ◽  
Hazard Indices ◽  
High Background ◽  
Activity Concentrations ◽  
Metavolcanic Rocks ◽  
High Background Radiation Area ◽  
Radiation Area ◽  
Radioactivity Levels

Twenty four samples of building materials, collected from utilized quarries dispersed randomly in a high natural background radiation area, were analyzed for 226Ra, 232Th and 40K by γ-spectrometry. This area lies in Hail province, Saudi Arabia. The collected samples were fragmented granites, granite gravels with clays, sands and crushed black rocks (mafic metavolcanic rocks). The results showed that the highest activity concentrations were found in the fragmented granite materials and ranged from 144-207, 671-1058 and 964-1440 Bq/kg with average values of 194, 912 and 1320 Bq/kg for 226Ra, 232Th and 40K, respectively. The lowest activity concentrations were found in the black rock materials which ranged from 19-39, 47-125 and 212-306 Bq/kg with average values of 24, 82 and 255 Bq/kg for 226Ra, 232Th and 40K, respectively. The radioactivity levels in the other materials lie somewhere in between. Granites and clays exceeded the proposed hazard indices for the usage as building materials and should be restricted, whereas the sands and the crushed black rocks complied with these indices and can be used without restrictions.

Dose estimates to the public due to 210Po ingestion via cocoa powder from Lolodorf high background radiation area, Cameroon

2018 ◽  
Vol 53 (3) ◽  
pp. 193-198
Author(s):  
S. Mvondo ◽  
J.F. Beyala Ateba ◽  
G.H. Ben-Bolie ◽  
P. Owono Ateba ◽  
A. Simo ◽  
...  
Keyword(s):  
Background Radiation ◽  
Dry Weight ◽  
Cocoa Beans ◽  
High Background ◽  
Cocoa Powder ◽  
Mean Values ◽  
The Public ◽  
Activity Concentrations ◽  
High Background Radiation Area ◽  
Radiation Area

210Po activity concentrations have been measured in Lolodorf high background radiation area in cocoa beans which are hand-processed into cocoa powder for breakfast purposes to estimate radiological dose to human. 210Po has been also measured in cocoa leaves and compared to the cocoa beans 210Po content. The analysis has been carried out by CANBERRA alpha spectrometry using ion-implanted silicon detectors. 210Po activity concentrations in cocoa beans varied from 2.31 ± 0.23 to 8.09 ± 0.56 Bq.kg−1, while these values varied from 21.7 ± 0.87 to 66.67 ± 1.58 Bq.kg−1 in cocoa leaves. The corresponding mean values are 4.96 ± 1.86 and 42.54 ± 16 Bq.kg−1 on a dry weight basis respectively. The obtained values confirm the fact that 210Po activity concentrations in cocoa leaves are high compared to the cocoa beans due to the deposition of 222Rn daughters in the atmosphere. The mean radiological doses to human were founded to be 0.227, 0.134, 0.083 and 0.062 mSv/year for children 2- to 7-year-olds, 7- to 12-year-olds, 12- to 17-year-olds and for adult respectively. Ingestion of cocoa powder by the most exposed group ages (children) might not exceed the recommended dose limit for members of the public, which is 1 mSv/year.

GAMMA DOSE RATES IN THE HIGH BACKGROUND RADIATION AREA OF MANGALORE REGION, INDIA

2019 ◽  
Vol 184 (3-4) ◽  
pp. 290-293 ◽  
Author(s):  
Darwish Al-Azmi ◽  
Sudeep Kumara ◽  
M P Mohan ◽  
N Karunakara
Keyword(s):  
Gamma Ray ◽  
Background Radiation ◽  
Gamma Dose ◽  
Natural Background ◽  
High Background ◽  
Natural Background Radiation ◽  
Dose Rates ◽  
Gamma Dose Rates ◽  
High Background Radiation Area ◽  
Normal Background

Abstract Elevated levels of natural background radiation due to scattered patches of monazite sand around the beaches of Mangalore, India, have been reported earlier. A comparative study of gamma dose rates was performed in both normal background and high natural background radiation areas around Mangalore using different types of portable gamma dosimeters. In addition to this, gamma-ray energy spectra were acquired, in situ, using a NaI(Tl) based portable gamma spectrometer. Soil and sand samples were collected for laboratory analysis with HPGe detectors. Measurements were carried out during the years 2016–18 revealed that in majority of the locations the gamma dose rates were similar to the normal background regions, whereas, in certain locations the dose rates were higher with values up to 530 nSv/h.

Cancer and non-cancer mortality among Inhabitants in the High Background Radiation Area of Yangjiang, China (1979–1998)

2012 ◽  
Vol 102 (2) ◽  
pp. 173-181 ◽  
Author(s):  
Zufan Tao ◽  
Suminori Akiba ◽  
Yongru Zha ◽  
Quanfu Sun ◽  
Jianming Zou ◽  
...  
Keyword(s):  
Cancer Mortality ◽  
Background Radiation ◽  
High Background ◽  
High Background Radiation Area ◽  
Radiation Area

scholarly journals Effect of Smoking on Chromosomes Compared with That of Radiation in the Residents of a High-Background Radiation Area in China

2004 ◽  
Vol 45 (3) ◽  
pp. 441-446 ◽  
Author(s):  
Wei ZHANG ◽  
Chunyan WANG ◽  
Deqing CHEN ◽  
Masako MINAMIHISAMATSU ◽  
Hiroshige MORISHIMA ◽  
...  
Keyword(s):  
Background Radiation ◽  
High Background ◽  
High Background Radiation Area ◽  
Radiation Area
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