育龄妇女X线检查的辐射遗传危险度估计可通过新生儿自然的和辐射诱发的严重遗传性疾病机率的对比得出.由于文献中缺乏与母亲年龄相关的新生儿遗传性疾病数量的报道,所以,本文在已有材料基础上,利用各年龄组母亲的唐氏征新生儿份额和新生儿总数来确定有唐氏征的新生儿数和他们与母亲相关的 Estimates of the genetic risk of radiation from X-ray examinations in women of childbearing age can be derived from a comparison of natural and radiation-induced rates of severe genetic disease in newborns.1 Because of a lack of literature on the number of neonatal genetic diseases that are age-related to mothers, On the basis of available materials, this paper uses the share of Down’s syndrome newborns and the total number of newborns in all age groups to determine the number of newborns with Down’s syndrome and their relatives