scholarly journals Excessive lifetime cancer risk and natural radioactivity measurements of granite and sedimentary rock samples

2017 ◽  
Vol 18 (4) ◽  
pp. 371-381
Author(s):  
E. S. Abd El-Halim ◽  
Nadia Walley El-Dine ◽  
Samia M. El-Bahi ◽  
Ibrahim E. El-Aassy ◽  
Enass M. El-Sheikh ◽  
...  
Keyword(s):  
Cancer Risk ◽  
Natural Radioactivity ◽  
Sedimentary Rock ◽  
Lifetime Cancer Risk ◽  
Rock Samples ◽  
Radioactivity Measurements

ASSESSMENT OF NATURAL RADIOACTIVITY IN MAIZE AND ESTIMATION OF CONCOMITANT DOSE TO NIGERIAN VIA INGESTION PATHWAY

2019 ◽  
Vol 184 (3-4) ◽  
pp. 359-362
Author(s):  
Mudassir H Yarima ◽  
M U Khandaker ◽  
A Nadhiya ◽  
M A Olatunji
Keyword(s):  
Cancer Risk ◽  
Natural Radioactivity ◽  
Gamma Ray ◽  
Gamma Ray Spectrometry ◽  
Detailed Knowledge ◽  
Dose Limit ◽  
Annual Dose ◽  
Lifetime Cancer Risk ◽  
Environmental Media ◽  
Naturally Occurring

Abstract Uranium, thorium and potassium are the most abundant naturally occurring radioactive materials (NORMs) found in soils and other environmental media including foodstuffs. Since the human exposures to NORMs is an unavoidable phenomenon, in such a way that they can easily find their way to human being via food chain, detailed knowledge on their presence in foodstuffs is necessary to assess the radiation dose to the population. Thus, the present study concerns the assessment of natural radioactivity in maize, a staple foodstuff for Nigerian, via HPGe gamma-ray spectrometry. Activity concentrations (Bq/kg) in the maize samples were found to be in the range of 6.1 ± 0.6–8.2 ± 1.3, 2.2 ± 0.4–5.1 ± 0.7 and 288 ± 16–401 ± 24 for 226Ra, 232Th and 40K, respectively. Measured data for 226Ra and 232Th show below the world average values of 67 Bq/kg and 82 Bq/kg, respectively, while the activity of 40K exceeds the global average of 310 Bq/kg. The annual effective dose via the maize consumption was found to be far below the UNSCEAR recommended ingestion dose limit of 290 μSv/y, and the estimated lifetime cancer risk show lower than the ICRP (1991) cancer risk factor of 2.5 × 10−3 based on the additional annual dose limit of 1 mSv for general public, thus pose no adverse health risk to the Nigerian populace.

Assessment of Natural Radioactivity in Some Soil Samples from Kutha District in Babylon Governorate, Iraq

2021 ◽  
Vol 14 (3) ◽  
pp. 267-274
Keyword(s):  
Cancer Risk ◽  
Effective Dose ◽  
Natural Radioactivity ◽  
Annual Effective Dose ◽  
Soil Samples ◽  
Lifetime Cancer Risk ◽  
Excess Lifetime Cancer Risk ◽  
Effective Annual Dose ◽  
Study Results ◽  
Radium Equivalent

Abstract: The activity concentrations of natural radionuclides of the elements (40K, 238U and 232Th), collected from Kutha district of Babylon governorate are studied and evaluated. Twenty soil samples with (0-15) cm in depth are collected. Gamma spectrometer NaI (TI) source is used for calibration. The radioactivities of natural isotopes K-40, U-238 and Th-232, were assessed. These studies show that radio activities of isotopes are acceptable according to the standard levels. Also, the activity of radium equivalent, the rate of annual effective dose, average air volume and external risk index are evaluated. The results are found within the internationally tolerable values. The results show that the mean of the radioactivity of 238U is (19.1565)Bq / kg, while it is (54.501) Bq/kg for 232Th and (179.578) Bq/kg for 40K. The study results showed that the average of radiological effects, like the Radium equivalent (Raeq), the rate of absorbed dose (Dr), the index of external hazard (Hex), the index of internal hazard (Hin), the index of representative gamma hazard (Iγ), the Annual Effective Dose Equivalent (AEDE) and the Excess Lifetime Cancer Risk (ELCR) are as follow: 110.920 Bq/kg, 50.1838 nGy/h, 0.29953, 59.1530, 27.996, 0.34 mSv/y and 1.268x10-3, respectively. Keywords: Natural radioactivity, Absorption, External hazard, Effective annual dose, Excess lifetime cancer risk.

scholarly journals Assessment of natural radioactivity and consequent radiological hazard in different brands of commercialized bottled mineral water produced in China

2020 ◽  
Vol 18 (4) ◽  
pp. 566-573
Author(s):  
Lang Yu ◽  
Guangwen Feng ◽  
Qian Liu ◽  
Chao Tang ◽  
Baoshan Wu ◽  
...  
Keyword(s):  
Cancer Risk ◽  
Natural Radioactivity ◽  
Mineral Water ◽  
World Health ◽  
Lifetime Cancer Risk ◽  
Potential Health ◽  
Activity Concentrations ◽  
Gross Β ◽  
Gross Α ◽  
Bottled Mineral Water

Abstract As one of the drinking water quality parameters, natural radioactivity parameters are recommended to prevent a potential health threat to the public. In this study, the gross-α and gross-β activity concentrations in 15 different brands of commercial bottled mineral water consumed in China were analyzed to evaluate the quality and corresponding health impact on the population. The activity concentrations of gross-α and gross-β in different samples varied from 4.4 to 130.6 and 17.3–320.3 mBq L–1, respectively. The values of the annual effective dose equivalent rate (AED) for infants, children and adults ranged from 1.3 to 21.6, 2.9–52.5 and 5.5–97.8 μSv y–1, respectively. The average excess lifetime cancer risk caused by the consumption of bottled mineral water samples was estimated as 6.0 × 10–5. These results show that all the measured gross-α and gross-β are found to be obviously less than the guidance level by WHO and the domestic standard. The values of AED are below the World Health Organization (WHO) recommended limit of 0.1 mSv y–1. Combined with the lifetime cancer risk assessment, it is concluded that there is no significant risk for consumption of the observed brands of bottled mineral water and it can be consumed safely.

scholarly journals Natural Radioactivity Measurements and Radiation Dose Estimation in Some Sedimentary Rock Samples in Turkey

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
I. Akkurt ◽  
K. Günoğlu
Keyword(s):  
Dose Rate ◽  
Natural Radioactivity ◽  
Sedimentary Rock ◽  
Annual Effective Dose ◽  
Hazard Index ◽  
Absorbed Dose ◽  
Absorbed Dose Rate ◽  
Rock Samples ◽  
External Hazard Index ◽  
Radium Equivalent

The natural radioactivity existed since creation of the universe due to the long life time of some radionuclides. This natural radioactivity is caused byγ-radiation originating from the uranium and thorium series and40K. In this study, the gamma radiation has been measured to determine natural radioactivity of238U,232Th, and40K in collected sedimentary rock samples in different places of Turkey. The measurements have been performed usingγ-ray spectrometer containing NaI(Tl) detector and multichannel analyser (MCA). Absorbed dose rate (D), annual effective dose (AED), radium equivalent activities (Raeq), external hazard index (Hex), and internal hazard index (Hin) associated with the natural radionuclide were calculated to assess the radiation hazard of the natural radioactivity in the sedimentary rock samples. The average values of absorbed dose rate in air (D), annual effective dose (AED), radium equivalent activity (Raeq), external hazard index (Hex), and internal hazard index (Hin) were calculated and these were 45.425 nGy/h, 0.056 mSv/y, 99.014 Bq/kg, 0.267, and 0.361, respectively.

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