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Mortality among atomic bomb survivors.

Y Shimizu1, H Kato, W J Schull

  • 1Department of Epidemiology, Radiation Effects Research Foundation, Hiroshima, Japan.

Journal of Radiation Research
|March 1, 1991
PubMed
Summary

Long-term studies of atomic bomb survivors show radiation increases risks for leukemia and many solid cancers. Non-cancer mortality may also increase at very high radiation doses, especially for those younger at the time of the bomb.

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Area of Science:

  • Radiation epidemiology
  • Atomic bomb survivor studies
  • Cancer mortality research

Background:

  • The Atomic Bomb Casualty Commission and Radiation Effects Research Foundation have studied 120,000 survivors since 1950.
  • Long-term follow-up is crucial for understanding radiation's delayed health effects.

Purpose of the Study:

  • To report recent findings on cancer and non-cancer mortality in atomic bomb survivors (1950-1985).
  • To analyze dose-response relationships using updated dosimetry (DS86).

Main Methods:

  • Analysis of a cohort of 120,000 atomic bomb survivors and controls.
  • Utilized DS86 dosimetry for updated radiation dose estimations.
  • Examined cancer and non-cancer mortality data from 1950 to 1985.

Main Results:

  • Radiation-related cancer list remains consistent; DS86 dosimetry confirms similar risk coefficients.
  • Confirmed increases in leukemia, lung, breast, esophagus, stomach, colon, ovary, bladder cancers, and multiple myeloma.
  • No increase observed for rectal, gallbladder, pancreatic, prostate, uterine cancers, or malignant lymphoma.
  • Radiation-induced solid cancers appear after the typical cancer age and increase with control group mortality.
  • Younger individuals at the time of the bomb (ATB) show higher sensitivity to radiation-induced cancer.
  • Non-cancer mortality shows a potential excess at very high doses, particularly in younger ATB cohorts, requiring further investigation.

Conclusions:

  • Updated dosimetry (DS86) confirms established radiation-related cancer risks.
  • Identified specific solid cancers with increased mortality post-exposure.
  • Age ATB significantly influences cancer risk sensitivity.
  • Further research is needed to confirm non-cancer mortality trends at high doses.

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