Cancer mortality in residents of the terrain-shielded area exposed to fallout from the Nagasaki atomic bombing

Abstract The health effects of radiation exposure from the atomic bomb fallout remain unclear. The objective of the present study is to elucidate the association between low-dose radiation exposure from the atomic bomb fallout and cancer mortality among Nagasaki atomic bomb survivors. Of 77 884 members in the Nagasaki University Atomic Bomb Survivors Cohort, 610 residents in the terrain-shielded area with fallout were selected for this analysis; 1443 residents in the terrain-shielded area without fallout were selected as a control group; and 3194 residents in the direct exposure area were also selected for study. Fifty-two deaths due to cancer in the terrain-shielded fallout area were observed during the follow-up period from 1 January 1970 to 31 December 2012. The hazard ratio for cancer mortality in the terrain-shielded fallout area was 0.90 (95% confidence interval: 0.65–1.24). No increase in the risk of cancer mortality was observed, probably because the dose of the radiation exposure was low for residents in the terrain-shielded fallout areas of the Nagasaki atomic bomb, and also because the number of study subjects was small.

[1]  Yukiko Shimizu,et al.  Studies of the Mortality of Atomic Bomb Survivors.Report 12, Part I. Cancer: 1950–1990 , 2012, Radiation research.

[2]  J. Harley,et al.  Radiation doses from residual radioactivity , 1987 .

[3]  S. Nagataki,et al.  HIGH PREVALENCE OF THYROID NODULE IN AREA OF RADIOACTIVE FALLOUT , 1989, The Lancet.

[4]  T. Norimura,et al.  Radioactive fallout effects of the Nagasaki atomic bomb. , 1978, Health physics.

[5]  放射線影響研究所,et al.  US-Japan joint reassessment of atomic bomb radiation dosimetry in Hiroshima and Nagasaki , 1987 .

[6]  Yukiko Shimizu,et al.  Studies of the Mortality of Atomic Bomb Survivors, Report 14, 1950–2003: An Overview of Cancer and Noncancer Diseases , 2012, Radiation research.

[7]  R. Shore,et al.  Long-Term Effects of the Rain Exposure Shortly after the Atomic Bombings in Hiroshima and Nagasaki , 2014, Radiation research.

[8]  S. Okajima.  Dose estimation from residual and fallout radioactivity. 3. Fallout in the Nagasaki--Nishiyama district. , 1975, Journal of radiation research.

[9]  G. Kerr,et al.  The Epicenter of the Nagasaki Weapon: A Reanalysis of Available Data with Recommended Values , 1976 .

[10]  George D. Kerr,et al.  Reassessment of the atomic bomb radiation dosimetry for Hiroshima and Nagasaki : dosimetry system 2002 : report of the joint US-Japan working group , 2005 .

[11]  Mortality of registered A-bomb survivors in Nagasaki, Japan, 1970-1984. , 1985, Radiation research.

[12]  E. Arakawa.  Radiation dosimetry in Hiroshima and Nagasaki atomic-bomb survivors. , 1960, The New England journal of medicine.

[13]  S. Okajima.  C. Dose Estimation from Residual and Fallout Radioactivity 3. Fallout in the Nagasaki —Nishiyama District— , 1975 .