Abstract
Levels of natural radionuclides, such as thorium-232 ( 232Th), radium-226 ( 226Ra) and potassium-40 ( 40K), were determined in about 2000 samples of imported mineral substances using gamma spectrometry. The maximum concentration levels of 232Th, 226Ra and 40K were 1260±54, 13400±94 and 1256±260 Bq kg −1, respectively, in zirconium compounds. Due to relatively high concentrations of the above-mentioned radionuclides in some imported mineral substances, the National Radiation Protection Department (NRPD), as the competent authority, has established national limits (900 Bq kg −1 for 232Th, 1800 Bq kg −1 for 226Ra and 11000 Bq kg −1 for 40K), based on the external exposures, for general importation permits of these materials.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
