Frequently Asked Questions
|10 |How is information about the atomic-bomb
|10 |To make monitoring easier in long-term follow-up of mortality and cancer
incidence due to radiation exposure, approximately 120,000 subjects were
selected from residents of Hiroshima and Nagasaki identified through the
national census in 1950, including 94,000 atomic-bomb survivors and 27,000
unexposed individuals, to comprise the Life Span Study (LSS) cohort.
Information about radiation effects in the atomic-bomb survivors
is obtained in many ways, some utilizing the full LSS
population, others based on subsets of that population.
- Mortality follow-up, checking for registrations of death
and the cause of death.
- Checking registrations of cancer diagnoses made by local hospitals and
physicians to the cancer registries in Hiroshima and Nagasaki Prefectures.
- Mail surveys asking about lifestyle and other factors have been sent
approximately every 10 years to the LSS cohort members.
- A subset of LSS (the Adult Health Study) is examined clinically every two years. This clinically examined subset
also forms the basis of cytogenetic, immunological, and molecular epidemiologic
- Chromosome aberrations and blood proteins have been examined
in a sample of approximately 16,000 and 23,000 children (respectively)
born to one or two radiation-exposed parents to assess possible
genetic damage passed on to children. Approximately 77,000 children
were examined at birth and at age 9 months, between 1948 and 1954,
- The health status of children of atomic-bomb survivors is being
examined based on mail surveys and clinical examinations.
Questionnaires were sent to approximately 24,600 individuals over a period of
four years starting in 2001, and clinical health examinations were conducted for about 12,000 people
between 2002 and 2006 to evaluate potential effects of parental radiation
exposure on late-onset lifestyle diseases.