CHARACTERIZATION OF SAND SAMPLES FROM KARACHI BEACHES USING GAMMA SPECTROMETRY AND XRD.
Journal
Radiation protection dosimetry
ISSN: 1742-3406
Titre abrégé: Radiat Prot Dosimetry
Pays: England
ID NLM: 8109958
Informations de publication
Date de publication:
13 Jul 2020
13 Jul 2020
Historique:
received:
17
12
2019
revised:
17
02
2020
accepted:
25
02
2020
pubmed:
21
3
2020
medline:
24
6
2021
entrez:
21
3
2020
Statut:
ppublish
Résumé
Chemical phase and distribution of natural radionuclides (226Ra, 232Th and 40K) were determined for sand samples collected from ten different beaches of Karachi. All samples, except one, were identified with major and minor phases as SiO2 and CaCO3, respectively. The average activity concentrations were 24.9, 25.0 and 239 Bq kg-1 for 226Ra, 232Th and 40K, respectively. Including all samples, the average radium equivalent activity was 79.1 Bq kg-1. The external and internal radiation hazard indices and representative level index were all found below unity. The average air absorbed dose rate at 1 m above the sand due to the natural radionuclides was 18.3 nGy h-1, which was less than the world average for soil. The corresponding annual effective dose rate was 22.4 μSv y-1. It was found that Raeq had positive significant correlation with the amount of quartz present at the beaches.
Identifiants
pubmed: 32195552
pii: 5810363
doi: 10.1093/rpd/ncaa035
doi:
Substances chimiques
Potassium Radioisotopes
0
Soil Pollutants, Radioactive
0
Thorium-232
0
Thorium
60YU5MIG9W
Silicon Dioxide
7631-86-9
Radium-226
PJ44V7L07A
Radium
W90AYD6R3Q
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
234-241Informations de copyright
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