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对胸腺肥大、寻常座疮、淋巴结核、发癣、扁桃体病变等进行放射治疗,当放射剂量在100至1500rems 之间、儿童低至6拉德时,即有可能引起甲状腺癌。据Modan 等计算:发病率约为每百万人、每rem、每年4.2例。潜伏期通常为10至30年。大剂量预部外照射引起甲状腺癌则属罕见,Maxon等称:甲状腺对照射剂量在2000rem 以上未必会引起甲状腺癌。作者报告了自1960至1969年间Stanford 大学医学中心接受斗蓬野(mantle)外照射、随访10年以上的患者544例,放射剂量均在4000拉德左右,放射治
Thyroid hypertrophy, acne vulgaris, lymph node tuberculosis, ringworm, tonsil lesions and other radiation therapy, when the radiation dose between 100 to 1500rems, children as low as 6 rad, that may cause thyroid cancer. According to Modan and other calculations: the incidence rate is about one million people per rem, 4.2 cases per year. The incubation period is usually 10 to 30 years. Large doses of pre-external radiation caused by thyroid cancer is rare, Maxon said: thyroid irradiation doses above 2000rem may not cause thyroid cancer. The authors reported 544 patients who had been exposed to mantle outside the Stanford University Medical Center from 1960 to 1969 for a period of 10 years or more and received radiation doses of about 5 000 rad. Radiotherapy