Volumic activities measurements and equivalent doses calculation of indoor 222Rn in Morocco

Choukri, Abdelmajid; Hakam, Oum Keltoum

doi:10.14319/ijcto.33.1

Cited by 3 publications

(4 citation statements)

References 10 publications

(9 reference statements)

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“…The results from the study were consistent with the findings of Choukri and Hakam [13] where radon concentration was 47 Bq m −3 in a house in stones and 31 Bq m −3 in other construction not in stones. The EPA [32] has indicated that the greatest risk of radon exposure is from tight, insufficiently ventilated buildings and buildings that have leaks allowing soil air from the ground into the basement and upper dwelling rooms.…”

Section: Correlation Of Indoor Radon Concentrations With Other Factorssupporting

confidence: 91%

“…In India, the findings of Singh and Kumar [12] were below the recommended indoor radon average of 100 Bq m −3 but these values were higher in winter than in summer. In Morocco, a study conducted by Choukri and Hakam [13] identified radon concentration to vary in houses, between 31 and 136 Bq m −3 . Currently, Ghana lacks a national average on radon concentration in homes due to few studies conducted [14] (table 1).…”

Section: Introductionmentioning

confidence: 99%

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An assessment of indoor radon level in a suburb of Ghana

Kitson-Mills

Sovoe

Opoku-Ntim

et al. 2019

Environ. Res. Commun.

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Radiation and radioactive isotopes form part of our natural environment. Elevated levels of these radioactive isotopes in the environment can pose a threat to our health. A greater proportion of the natural radiation is from the radioactive gas radon. Although it cannot be detected by human senses, radon and its progenies are of health concern as it can cause lung cancer when inhaled over a period of time. This study sought to provide baseline indoor radon data, the life time risk of lung cancer and its interpretation within a suburb of Ghana. Solid State Nuclear Track Detector (LR-115 type II) was deployed in 82 homes within a suburb for a period of three months (September 2017-January 2018). Indoor radon concentration (IRC) for the suburb was within the range of 4.1-176.3 Bq m −3 . With mean 57±39 Bq m −3 . The mean radon exposure to the dwellers was recorded as 0.12±0.08 WLMy −1 resulting in 0.7±0.5 mSvy −1 effective dose to the lung with an excess lifetime cancer risk of 0.39±0.26%. There was a positive correlation between indoor radon concentration and the building type and the association was significant with a P value of 0.047.

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Section: Correlation Of Indoor Radon Concentrations With Other Factorssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

An assessment of indoor radon level in a suburb of Ghana

Kitson-Mills

Sovoe

Opoku-Ntim

et al. 2019

Environ. Res. Commun.

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“…Table 5 shows the average concentration of radon in homes in the city of Kaya, Banlieue du Ghana 57 ± 39 [27] Soudan (Kordufan) 109.43 [28] Soudan (Wad Almahi) 41.52 [28] Maroc 80 [29] Ouagadougou and other cities in Africa. The average concentration of radon in the houses studied in Koudougou is 38.52 Bq/m 3 and higher than that obtained in homes in the city of Ouagadougou and Kaya.…”

Section: Comparisons Of Concentrations With Other Studies Carried Outmentioning

confidence: 99%

Measurement of Radon Concentration and Estimation of Cancer Risk in Twenty-Four Model Houses in the Town of Koudougou

Derra,

Bambara,

Kaboré

et al. 2024

OJAppS

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The objective of our study is to evaluate the concentration of radon ( 86 Rn) inside houses in the town of Koudougou in order to estimate its impact on the health of the population. Indeed, when uranium-rich minerals are found near the surface of the ground, radon concentrations can reach tens of becquerels per cubic meter in enclosed spaces. Given the nature of the geological base of Burkina Faso, this situation is quite probable and certain places that are sometimes poorly ventilated (house, school, office, etc.) can have radon levels high enough to constitute a health problem for occupants. Thus, twenty-four (24) sample houses were identified. In each house, the Corentium digital detector was between 0.8 m and 2 m for at least one week in a place where the occupants estimate that they spend more time of time and measure the concentration of radon in the long term and short term. The recorded data allowed us to determine the Absorbed Dose and the Annual Effective Dose of radon gas for each house in order to estimate the Risk of Cancer and the probable Number of Cases of Lung Cancer per million inhabitants. Thus, the results indicate that the long-term radon concentration varies between 6 Bq/m 3 and 285 Bq/m 3 respectively in houses 11 and 4 compared to 1 Bq/m 3 to 208 Bq/m 3 in the short term in the same houses. Also, in the long term, in control houses 1, 3 and 4, the radon level is above the recommended threshold interval. For the short term, these are houses 1, 3, 4 and 17 respectively with 110 Bq/m 3 , 142 Bq/m 3 , 208 Bq/m 3 and 105 Bq/m 3 . As for the long-term and short-term effective doses, only houses 1, 3, 4, 17 and 24 have values between 3 -10 Sv/year. The estimation of the relative risk of lung cancer gives How to cite this paper:

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“…The choice of the indoor occupancy factor of 0.8 was made in order to estimate the total annual effective dose received by students even if the time of their presence in classrooms did not exceed 12% (30 h/week × 34 weeks/ year). Indeed, this choice was based on values of radon concentrations measured in houses in this region, recorded by Abdo et al, Choukri and Hakam, 35,36 which belong to current measurement intervals in primary schools.…”

Section: Annual Effective Dosementioning

confidence: 99%

Development of a corrective model of short-term radon concentrations to estimate annual effective doses in the primary schools of the Doukkala-Abda region, Morocco

Ouakkas

Boukhair

Abdo

et al. 2022

Indoor and Built Environment

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In order to assess the radiological impact of radon on >250,000 students, the total annual effective dose was estimated inside 204 Moroccan primary schools sampled in the Doukkala-Abda region. The measurement of indoor radon concentrations was conducted using the LR115 detector for each month, each season and throughout the year. The evolution of indoor radon concentrations showed a decrease in annual average radon concentrations of 20–26% and 10–14%, respectively, compared to the monthly and seasonal annual average radon concentrations. For this purpose, a corrective model of short-term radon concentrations was developed to calculate the seasonal correction factors in order to estimate the annual indoor radon concentrations. For the qualitative evaluation of these factors, a percentage of deviation between the measured and estimated annual radon concentrations was calculated. Almost half of the estimated annual concentrations were 10% less than the measured concentration and the majority of these estimated values were within 40%. The estimated total annual effective doses received by students, except those in the Sidi Bennour city, were higher than the world average (1.15 mSv/y). Nevertheless, all these doses remained below the permissible limit recommended by the International Commission on Radiological Protection (3–10 mSv/y).

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Volumic activities measurements and equivalent doses calculation of indoor 222Rn in Morocco

Cited by 3 publications

References 10 publications

An assessment of indoor radon level in a suburb of Ghana

An assessment of indoor radon level in a suburb of Ghana

Measurement of Radon Concentration and Estimation of Cancer Risk in Twenty-Four Model Houses in the Town of Koudougou

Development of a corrective model of short-term radon concentrations to estimate annual effective doses in the primary schools of the Doukkala-Abda region, Morocco

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