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Natural radionuclides and assessment of radiological hazards in MuongHum, Lao Cai, Vietnam
- Source :
- Chemosphere. 270
- Publication Year :
- 2020
-
Abstract
- 226Ra, 238U, 4 K, and 232Th (228Ra) activity concentrations of 61 soil samples distributed surrounding the rare earth element mine (NORM), MH, Lao Cai, Vietnam have been measured by HPGe detector. The activity concentrations of 226Ra, 238U, 4 K, and 232Th (228Ra) range from 1179 to 6291 Bq/kg, from 1024 to 8351 Bq/kg, from 260 to 3519 Bq/kg, and from 1476 to 35546 Bq/kg in the ore body and from 21.3 to 964 Bq/kg, from 23.4 to 1635 Bq/kg, from 124 to 3788 Bq/kg, and from 40.9 to 6107 Bq/kg outside the ore body in respective. The study area is considered as the high local natural background radiation with the concentration of 226Ra, 238U, 4 K, and 232Th (228Ra) of 156, 254, 647, and 908 Bq/kg in respective. Regarding the spatial distribution, the measured radionuclide concentrations are independent of the distance from measured points to the ore body. With regard to the hazard indices, the average calculated radiological hazard indices, including absorbed gamma dose rate, effective dose equivalent, and excess lifetime cancer risk significantly exceed the global average values. There is a disequilibrium between 238U/226Ra concentrations in studied soil samples. The results also found that the 232Th (228Ra) concentration and total absorbed gamma dose rate show a strong positive correlation (coefficient of determination, R2 = 1).
- Subjects :
- Environmental Engineering
Coefficient of determination
Soil test
Health, Toxicology and Mutagenesis
0208 environmental biotechnology
Potassium Radioisotopes
02 engineering and technology
010501 environmental sciences
Positive correlation
01 natural sciences
Animal science
Gamma dose
Radiation Monitoring
Environmental Chemistry
Background Radiation
Soil Pollutants, Radioactive
0105 earth and related environmental sciences
Radioisotopes
Radionuclide
Thorium
Public Health, Environmental and Occupational Health
General Medicine
General Chemistry
Pollution
020801 environmental engineering
Spectrometry, Gamma
Vietnam
Radiological weapon
Environmental science
Cancer risk
Hpge detector
Radium
Subjects
Details
- ISSN :
- 18791298
- Volume :
- 270
- Database :
- OpenAIRE
- Journal :
- Chemosphere
- Accession number :
- edsair.doi.dedup.....fa6b7a105fe76ea4be48a834b0d77546