Red bone marrow dose accumulated until the mentioned age and its proportion of the reference value (total dose of the cohort 1920–1929 at the age of 70).

The fraction decreases with rising birth year. The only exceptions are subjects of the birth cohorts 1940–1949 in childhood and as young adults. These groups are exposed to higher doses than the previous birth cohort 1920–1929.该比例随出生年份的升高呈下降趋势。唯一的例外为1940–1949年出生队列（birth cohort）的研究对象，在其童年与青年时期。相较于此前的1920–1929年出生队列，该群体所接受的剂量水平更高。