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The book has been put together very thoughtfully and carefully and I'm sure your readers will appreciate the tremendous amount of effort you and your colleagues have put forth to conduct these careful studies over many years. -- Brues Boecker. Lovelace Respiratory Research Institute. U.S.A. In this monograph, the results of 1158 measurements of exhaled thoron activity, About 10422 measurements of four peripheral blood and five hepatic function parameters, 1158 measurements of lung function test and X-ray radiograph on the miners were reported. --Tiecheng Fu. China Institute for Radiation Protection. China. Thank you for forwarding me your paper on the long term health effects of exposure to Th and SiO2. I found the paper interesting. It is a land mark study. Rogar O. McClellan. Toxicology and Human Health Risk Analysis. U.S.A This series of investigations, which began in the mid-1970s, culminated in the first report showing that lung cancer can be induced in humans by inhalation of natural thorium dioxide
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