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Assessment of radon exhalation rate, radon concentration and annual efective dose of some building materials samples used in Yemen

Saleh Emran Eisa, Al-Sobahi Aref Mohammed Ahmed, El-Fiki Soad Abed Elmonem

Acta Geophysica

2021

Vol. 69, no. 4

1325--1333

Radon gas has been recognized as one of the health hazards to humans. Building materials used for the construction of houses, which are considered as one of the major sources of this gas in indoor environments. The radon exhalation rate, radon concentration as well as the annual efective dose for 46 samples of building materials (granite, ceramic, marble, mosaic, rocks, gypsum, block and red brick) used in Yemen were measured using two methods. The can technique, containing CR-39 solid-state detector, and active method containing AlphaGuard detector were used. The results obtained from passive and active techniques were found in good agreement. The results showed that the highest values of radon exhalation rate, radon concentration and the annual efective dose indoor and outdoor were 0.93 ± 0.020 Bqm-2 h-1, 186.48 ± 3.73 Bqm-3, 4.7 ± 0.141 and 1.76 ± 0.053 mSvy-1 for granite samples, whereas the lowest values were 0.0076 ± 0.001 Bqm-2 h-1, 1.51 ± 0.03 Bqm-3, 0.04 ± 0.001 and 0.01 ± 0.001 mSvy-1 for the ceramic samples. The results also showed that the radon exhalation rate, as well as the annual efective dose, was found below the world average values of 57.600 Bq m-2 h-1, 1100 μSv y-1 with exception of some samples. The values of radon concentrations for granite samples were in the range of activity levels from 200 to 600 Bq m-3 recommended by (ICRP, 1994).

Radioactivity of some building and raw materials used in Croatia

Sofilić T., Barišić D., Sofilić U., Đuroković M.

Polish Journal of Chemical Technology

2011

Vol. 13, nr 3

23-27

In the present study, the activity concentrations of 226Ra, 232Th, 40K in some building and raw materials used in Croatia were measured by using a gamma-ray spectrometer with the HPGe detector. The average activity concentrations of the studied different building and raw materials ranged from 11.6 š 1.7 (concrete) to 251.2 š 25.7 Bqkg-1 (GBFS), 14.0 š 2.7 (concrete) to 54.4 š 8.3 (coal fly ash) and 147.2 š 19.0 (concrete) to 773.7 š 82.0 Bqkg-1 (tuff) for 226Ra, 232Th and 40K, respectively. Radium equivalent activity, activity concentration index, absorbed gamma dose rate indoor due to the external exposure and corresponding annual effective dose were determined to estimate the exposure risk arising due to the use of these building and raw materials.