研究对象为757名在美国克罗拉多高原钠瓦若铀矿工作过的工人,从事井下工作至少1个月,并参加过美国公共卫生事业局于1950～1960年进行的医学调查。从每年度的人口普查资料中获得铀矿工人的职业、医疗和吸烟状况,氡子体接触剂量按照在井下工作水平月数计算。根据社会安全局等部门的登记资料确定 The study population consisted of 757 workers working at the Na Wau Mo uranium in the Colorado Plateau, the United States, who worked at the mine for at least one month and participated in medical investigations conducted by the U.S. Public Health Service from 1950 to 1960. The occupational, medical and smoking status of uranium miners is obtained from the annual census data, and the exposure dose of radon progeny is calculated according to the number of months of working downhole. According to the Social Security Administration and other departments registration information to determine