Assessment of terrestrial gamma radiation doses for some Egyptian granite samples

Arabi, A. M. El; Ahmed, Nagwa S.; Din, Khaled Salahel

doi:10.1093/rpd/ncm367

Cited by 14 publications

(14 citation statements)

References 10 publications

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“…An average dose value of 0.583 mSv/yr obtained within the administrative block (no processing or storing of timber) of the factory, which gives a difference of 5.62% compared to the environmental background value [ Figure 2 ] further confirms that the building brick could be the source of the higher dose value within the administrative block. The situation here is similar to those reported by Arabi et al [ 24 ] and UNSCEAR. [ 17 ]…”

Section: Discussionsupporting

confidence: 93%

Radiation exposure levels within timber industries in Calabar, Nigeria

Inyang¹,

Inyang²,

Egbe³

2009

J Med Phys

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The UNSCEAR (2000) observed that there could be some exposure at work which would require regulatory control but is not really considered. This study was, therefore, set up to evaluate the effective dose in timber industries in Calabar, Nigeria to determine if the evaluated dose levels could lead to any radiological health effect in the workers, and also determine if the industries require regulatory control. The gamma ray exposure at four timber industries measured using an exposure meter were converted to effective dose and compared with the public and occupational values. The evaluated effective dose values in the timber industries were below public and occupational exposure limits and may not necessarily result in any radiological health hazard. Therefore, they may not require regulatory control.

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Section: Discussionsupporting

confidence: 93%

Radiation exposure levels within timber industries in Calabar, Nigeria

Inyang¹,

Inyang²,

Egbe³

2009

J Med Phys

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“…The estimated values of the external and internal hazard indices ( Table 2 ) for all types of building material samples analyzed in this work (except FA) were found to be less than the recommended limit of 1 for the safe utilization of a material in the construction of dwellings [ 5 , 10 , 21 , 48 ].…”

Section: Resultsmentioning

confidence: 71%

“…Because the investigated materials (e.g., brick, cement and sand) are extensively used as construction materials in homes, it is important to evaluate their effects on indoor exposure. Considering that the indoor dose contribution is 1.4 times higher than the outdoor dose contribution, the gamma dose D in (nGy h –1 ) in the indoor environment that is delivered by radionuclides (gamma discharge from 226 Ra, 232 Th and 40 K) in the investigated structural construction materials was assessed using Eq ( 6 ) [ 40 , 48 ]: …”

Section: Methodsmentioning

confidence: 99%

Assessment of Natural Radioactivity Levels and Potential Radiological Risks of Common Building Materials Used in Bangladeshi Dwellings

et al. 2015

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The concentrations of primordial radionuclides (226Ra, 232Th and 40K) in commonly used building materials (brick, cement and sand), the raw materials of cement and the by-products of coal-fired power plants (fly ash) collected from various manufacturers and suppliers in Bangladesh were determined via gamma-ray spectrometry using an HPGe detector. The results showed that the mean concentrations of 226Ra, 232Th and 40K in all studied samples slightly exceeded the typical world average values of 50 Bq kg−1, 50 Bq kg−1 and 500 Bq kg−1, respectively. The activity concentrations (especially 226Ra) of fly-ash-containing cement in this study were found to be higher than those of fly-ash-free cement. To evaluate the potential radiological risk to individuals associated with these building materials, various radiological hazard indicators were calculated. The radium equivalent activity values for all samples were found to be lower than the recommended limit for building materials of 370 Bq kg-1, with the exception of the fly ash. For most samples, the values of the alpha index and the radiological hazard (external and internal) indices were found to be within the safe limit of 1. The mean indoor absorbed dose rate was observed to be higher than the population-weighted world average of 84 nGy h–1, and the corresponding annual effective dose for most samples fell below the recommended upper dose limit of 1 mSv y–1. For all investigated materials, the values of the gamma index were found to be greater than 0.5 but less than 1, indicating that the gamma dose contribution from the studied building materials exceeds the exemption dose criterion of 0.3 mSv y-1 but complies with the upper dose principle of 1 mSv y−1.

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“…9,51 Measurement of radioactivity HPGe detector from ORTEC. The relative efficiency of the p-type coaxial HPGe c-ray spectrophotometer was 28.2% and an energy resolution of 1.67 keV-FWHM for the 1332.5 keV peak of 60 Co. A detector is shielded by thick cylindrical lead to minimize gamma-ray background of the laboratory site. A 16k MCA was used for acquisition of data from the detector.…”

Section: Properties Of Poc and Pofamentioning

confidence: 99%

“…Bhd was issued in the new site of the University of Malaya (dated at 2 September 2016). 58 By considering that indoor contributions to dose are 1.4 times greater that of the outdoor dose, the indoor absorbed dose rate was estimated by equation (4) 39,52,59,60…”

Section: Radium Equivalent Activity (Ra Eq )mentioning

confidence: 99%

Radiological risks assessment of building materials ingredients: Palm oil clinker and fuel ash

Karim

Khandaker

Asaduzzaman

et al. 2018

Indoor and Built Environment

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Technical benefits relevant to the use of palm oil clinker (POC) and fuel ash (POFA) in building materials has been well documented. However, the radiological health hazards caused by the incorporation of POC and POFA as an ingredient of building materials have not been studied so far. The radioactivity levels were measured by γ-ray spectrometry using hyper-pure germanium (HPGe) detector. The activity concentration of 226Ra and 232Th in POC and POFA was found to be in the ranges of 5.56 ± 0.23 to 9.03 ± 0.21 and 4.21 ± 0.03 to 7.98 ± 0.19 Bq kg−1, respectively, and these values were lower than the world average values of 50 Bq kg−1 for building materials. The 40K value was within the range of 413.01 ± 1.78 to 604.66 ± 2.18 Bq kg−1. Several radiological parameters and hazard indices, i.e. radium equivalent activity, absorbed dose rate and annual effective dose etc. were calculated for the evaluation of the potential radiological hazards. The obtained values fall within the recommended limit set by various international organizations. Since the activity levels of 226Ra, 232Th and 40K in POC and POFA were significantly lower than the corresponding literature data for other ingredients of building materials, it indicates that POC and POFA are safe to be used in concrete construction.

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Assessment of terrestrial gamma radiation doses for some Egyptian granite samples

Cited by 14 publications

References 10 publications

Radiation exposure levels within timber industries in Calabar, Nigeria

Radiation exposure levels within timber industries in Calabar, Nigeria

Assessment of Natural Radioactivity Levels and Potential Radiological Risks of Common Building Materials Used in Bangladeshi Dwellings

Radiological risks assessment of building materials ingredients: Palm oil clinker and fuel ash

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