Assessment of Radiation Hazard from External and Internal Exposures at Adham and Surroundings in KSA

Twenty-eight environmental samples (eight well water, sixteen granitic rocks and four soils) were collected from different parts of Adham governorate (Adham, Haqal Al-Jaizah), to assess the radiological hazard cancer risk perspectives. is situated in a valley between two mountain chains, where much water supply for drinking, house use irrigation comes wells collecting rains. The activity concentrations naturally occurring 40K, 226Ra 232Th radionuclides measured by gamma-ray spectrometry all using RGK-1, RGU-1 RGTh-1, IAEA reference standards issued International Atomic Energy Agency, detector efficiency calibration. values utilized evaluate internal external exposures both outdoors indoors. Different standard room models adopted this respect indoor gamma-rays exposure construction materials as radon gas emanating them. Radon concentration indoors, exceeded upper level dwellings set at 300 Bq/m3 world health organization, many scenarios. mean value total excess lifetime (due gamma-rays) was 2.29 × 10-3, above average 1.45 10-3. Furthermore, EPA (Environmental Protection Agency) 11.1 Bq·L-1 drinking ranging 12 38 with 27 Bq·L-1. annual effective dose inhalation ingestion) ranged 58 192 μSv/y (for adults) exceeding international permissible limit 100 μSv/y, seven out eight samples. According obtained results, directly used wells, might be major reason any suspected especially Haqal. second poorly ventilated dwellings.