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A 20-year follow-up study on the effects of long-term exposure to thorium dust. 2003

Xing'an Chen, and Yonge Cheng, and Huijuan Xiao, and Guodong Feng, and Yunhui Deng, and Zhiliang Feng, and Lian Chen, and Xuanmao Han, and Yingjie Yang, and Zhihuan Dong, and Rong Zhen
Laboratory of Industrial Hygiene, Ministry of Health, Beijing 100088, China. chenxing_an@hotmail.com

OBJECTIVE To investigate the possible effects of long-term exposure to dust containing thorium and thoron progeny on dust-exposed miners. METHODS A negative, high voltage, exhaled thoron progeny measurement system was used to estimate the miners' thorium lung burden. RESULTS The highest thorium lung burden of 638 miners was 11.11 Bq. The incidence of stage 0(+) pneumoconiosis was higher among dust-exposed miners. Lung cancer mortality of the dust-exposed miners was significantly higher than that of controls (P < 0.005). CONCLUSIONS There is a difference in cancer rates between those who have long-term exposure to dust containing thorium (in which carcinogenic ThO(2) and SiO(2) exist) and thoron progeny and those who have not.

UI MeSH Term Description Entries
D008175 Lung Neoplasms Tumors or cancer of the LUNG. Cancer of Lung,Lung Cancer,Pulmonary Cancer,Pulmonary Neoplasms,Cancer of the Lung,Neoplasms, Lung,Neoplasms, Pulmonary,Cancer, Lung,Cancer, Pulmonary,Cancers, Lung,Cancers, Pulmonary,Lung Cancers,Lung Neoplasm,Neoplasm, Lung,Neoplasm, Pulmonary,Pulmonary Cancers,Pulmonary Neoplasm
D008906 Mining The process of extracting mineral deposits from the earth.
D009784 Occupational Diseases Diseases caused by factors involved in one's employment. Diseases, Occupational,Occupational Illnesses,Disease, Occupational,Illnesse, Occupational,Illnesses, Occupational,Occupational Disease,Occupational Illnesse
D001822 Body Burden The total amount of a chemical, metal or radioactive substance present at any time after absorption in the body of man or animal. Body Burdens,Burden, Body,Burdens, Body
D002681 China A country spanning from central Asia to the Pacific Ocean. Inner Mongolia,Manchuria,People's Republic of China,Sinkiang,Mainland China
D004391 Dust Earth or other matter in fine, dry particles. (Random House Unabridged Dictionary, 2d ed) House Dust,Housedust,Dust, House
D005500 Follow-Up Studies Studies in which individuals or populations are followed to assess the outcome of exposures, procedures, or effects of a characteristic, e.g., occurrence of disease. Followup Studies,Follow Up Studies,Follow-Up Study,Followup Study,Studies, Follow-Up,Studies, Followup,Study, Follow-Up,Study, Followup
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000396 Air Pollutants, Radioactive Pollutants present in air which exhibit radioactivity. Radioactive Air Pollutants,Pollutants, Radioactive Air
D013910 Thorium A radioactive element of the actinide series of metals. It has an atomic symbol Th, atomic number 90, and atomic weight 232.04. It is used as fuel in nuclear reactors to produce fissionable uranium isotopes. Because of its radioopacity, various thorium compounds are used to facilitate visualization in roentgenography.

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