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

Author:

Ouakkas Saad1ORCID,Boukhair Aziz12ORCID,Abdo Maged Ahmed Saleh1,Benjelloun Mohammed1

Affiliation:

1. LPNAMME, Nuclear Physics and Technology Group, Department of Physics, Faculty of Sciences, Chouaïb Doukkali University, El Jadida, Morocco

2. Regional Center of the Trades of Education and Training, Casablanca-Settat, Morocco

Abstract

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).

Publisher

SAGE Publications

Subject

Public Health, Environmental and Occupational Health,Building and Construction

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