Estimation of radon and thoron caused dose at exraction and processing sites of mineral sand mining area in Vietnam (HA TINH province)

Bui Dac Dung, Trinh Van Giap, T. Kovács, Tran Ngoc Toan, Le Dinh Cuong, Tran Khanh Minh, Nguyen Huu Quyet, Nguyen Van Khanh

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Mineral sands are mined in several countries to supply to the titanium and zircon producing industries. Coastal black mineral sands usually contain, besides ilmenite (FeTiO3) and rutile (TiO2), radioactive minerals such as zircon (ZrSiO4) and monazite (RePO4). Radon and thoron activity concentration originated from natural radioactive contents of the black mineral sand was monitored at the extraction and processing for black minerals in the coastal areas of Ha Tinh Province, one of the around 40 coastal mineral sand deposits in Vietnam. The survey was carried out with the Raduet chambers made by Radosys Ltd - Hungary. The obtained results for 25 investigated points show that the measured values are not high in the residential houses and in case of the sand extraction site as well. At the titanium processing plant the measured values were higher than outside the facility (Radon: 18-55 Bq/m3 with average of 34 Bq/3 and Thoron 33-118 Bq/m3 with average of 58 Bq/m3) but still comparable to the average concentration of the world published by UNSCEAR. The typical outdoor levels of radon and thoron gas are each of the order of 10 Bq/m3. Although the radon concentrations were low in the zircon and titanium processing plants, the thoron concentrations in the houses for separating rutile and zircon were very high. At zircon processing factory, the thoron concentration could reach 2,931 Bq/m3 and the estimated annual effective dose would be 21.4 mSv/a. Intervention has to be taken in order to reduce the thoron level in this factory since the level of thoron and its progenies corresponding to an annual occupational effective dose is beyond the action level of 6 mSv/a.

Original languageEnglish
Pages (from-to)1943-1948
Number of pages6
JournalJournal of Radioanalytical and Nuclear Chemistry
Volume299
Issue number3
DOIs
Publication statusPublished - 2014

Fingerprint

Radon
Vietnam
Zircon
Dosimetry
Minerals
Sand
Processing
Titanium
Industrial plants
Monazite
Ilmenite
Hungary
zircon
Industry
Deposits
Gases

Keywords

  • Monazite
  • NORM
  • Radiation dose
  • Radon
  • Thoron

ASJC Scopus subject areas

  • Analytical Chemistry
  • Nuclear Energy and Engineering
  • Health, Toxicology and Mutagenesis
  • Pollution
  • Public Health, Environmental and Occupational Health
  • Spectroscopy
  • Radiology Nuclear Medicine and imaging

Cite this

Estimation of radon and thoron caused dose at exraction and processing sites of mineral sand mining area in Vietnam (HA TINH province). / Dung, Bui Dac; Van Giap, Trinh; Kovács, T.; Toan, Tran Ngoc; Cuong, Le Dinh; Minh, Tran Khanh; Quyet, Nguyen Huu; Van Khanh, Nguyen.

In: Journal of Radioanalytical and Nuclear Chemistry, Vol. 299, No. 3, 2014, p. 1943-1948.

Research output: Contribution to journalArticle

Dung, Bui Dac ; Van Giap, Trinh ; Kovács, T. ; Toan, Tran Ngoc ; Cuong, Le Dinh ; Minh, Tran Khanh ; Quyet, Nguyen Huu ; Van Khanh, Nguyen. / Estimation of radon and thoron caused dose at exraction and processing sites of mineral sand mining area in Vietnam (HA TINH province). In: Journal of Radioanalytical and Nuclear Chemistry. 2014 ; Vol. 299, No. 3. pp. 1943-1948.
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T1 - Estimation of radon and thoron caused dose at exraction and processing sites of mineral sand mining area in Vietnam (HA TINH province)

AU - Dung, Bui Dac

AU - Van Giap, Trinh

AU - Kovács, T.

AU - Toan, Tran Ngoc

AU - Cuong, Le Dinh

AU - Minh, Tran Khanh

AU - Quyet, Nguyen Huu

AU - Van Khanh, Nguyen

PY - 2014

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N2 - Mineral sands are mined in several countries to supply to the titanium and zircon producing industries. Coastal black mineral sands usually contain, besides ilmenite (FeTiO3) and rutile (TiO2), radioactive minerals such as zircon (ZrSiO4) and monazite (RePO4). Radon and thoron activity concentration originated from natural radioactive contents of the black mineral sand was monitored at the extraction and processing for black minerals in the coastal areas of Ha Tinh Province, one of the around 40 coastal mineral sand deposits in Vietnam. The survey was carried out with the Raduet chambers made by Radosys Ltd - Hungary. The obtained results for 25 investigated points show that the measured values are not high in the residential houses and in case of the sand extraction site as well. At the titanium processing plant the measured values were higher than outside the facility (Radon: 18-55 Bq/m3 with average of 34 Bq/3 and Thoron 33-118 Bq/m3 with average of 58 Bq/m3) but still comparable to the average concentration of the world published by UNSCEAR. The typical outdoor levels of radon and thoron gas are each of the order of 10 Bq/m3. Although the radon concentrations were low in the zircon and titanium processing plants, the thoron concentrations in the houses for separating rutile and zircon were very high. At zircon processing factory, the thoron concentration could reach 2,931 Bq/m3 and the estimated annual effective dose would be 21.4 mSv/a. Intervention has to be taken in order to reduce the thoron level in this factory since the level of thoron and its progenies corresponding to an annual occupational effective dose is beyond the action level of 6 mSv/a.

AB - Mineral sands are mined in several countries to supply to the titanium and zircon producing industries. Coastal black mineral sands usually contain, besides ilmenite (FeTiO3) and rutile (TiO2), radioactive minerals such as zircon (ZrSiO4) and monazite (RePO4). Radon and thoron activity concentration originated from natural radioactive contents of the black mineral sand was monitored at the extraction and processing for black minerals in the coastal areas of Ha Tinh Province, one of the around 40 coastal mineral sand deposits in Vietnam. The survey was carried out with the Raduet chambers made by Radosys Ltd - Hungary. The obtained results for 25 investigated points show that the measured values are not high in the residential houses and in case of the sand extraction site as well. At the titanium processing plant the measured values were higher than outside the facility (Radon: 18-55 Bq/m3 with average of 34 Bq/3 and Thoron 33-118 Bq/m3 with average of 58 Bq/m3) but still comparable to the average concentration of the world published by UNSCEAR. The typical outdoor levels of radon and thoron gas are each of the order of 10 Bq/m3. Although the radon concentrations were low in the zircon and titanium processing plants, the thoron concentrations in the houses for separating rutile and zircon were very high. At zircon processing factory, the thoron concentration could reach 2,931 Bq/m3 and the estimated annual effective dose would be 21.4 mSv/a. Intervention has to be taken in order to reduce the thoron level in this factory since the level of thoron and its progenies corresponding to an annual occupational effective dose is beyond the action level of 6 mSv/a.

KW - Monazite

KW - NORM

KW - Radiation dose

KW - Radon

KW - Thoron

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