Abstract
Data from the survivors of the atomic bombs serve as the major basis for risk calculations of radiation-induced cancer in humans1. A controversy has existed for almost two decades, however, concerning the possibility that neutron doses in Hiroshima may have been much larger than estimated. This controversy was based on measurements of radioisotopes activated by thermal neutrons that suggested much higher fluences at larger distances than expected2,3,4,5,6. For fast neutrons, which contributed almost all the neutron dose, clear measurement validation has so far proved impossible at the large distances (900 to 1,500 m) most relevant to survivor locations6. Here, the first results are reported for the detection of 63Ni produced predominantly by fast neutrons (above about 1 MeV) in copper samples from Hiroshima. This breakthrough was made possible by the development of chemical extraction methods7,8 and major improvements in the sensitivity of accelerator mass spectrometry for detection of 63Ni atoms (refs 8–11). When results are compared with 63Ni activation predicted by neutron doses for Hiroshima survivors6, good agreement is observed at the distances most relevant to survivor data. These findings provide, for the first time, clear measurement validation of the neutron doses to survivors in Hiroshima.
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References
BEIR V Report. Health Effects of Exposure to Low Levels of Ionizing Radiation (National Academy Press, Washington DC, 1990)
Hoshi, M. et al. Europium-152 activity induced by Hiroshima atomic bomb neutrons: comparison with the 32P, 60Co, and 152Eu activities in Dosimetry System 1986 (DS86). Health Phys. 57, 831–837 (1989)
Straume, T. et al. Neutron discrepancies in the DS86 Hiroshima dosimetry system. Health Phys. 63, 421–426 (1992)
Shizuma, K. et al. Residual 152Eu and 60Co activities induced by neutrons from the Hiroshima atomic bomb. Health Phys. 65, 272–282 (1993)
Shizuma, K. et al. Residual 60Co activity in steel samples exposed to the Hiroshima atomic-bomb neutrons. Health Phys. 75, 278–284 (1998)
Roesch, W. C. (ed.) US-Japan Joint Reassessment of Atomic Bomb Radiation Dosimetry in Hiroshima and Nagasaki -Final Report (Radiation Effects Research Foundation, Hiroshima, 1987)
Marchetti, A. A. et al. Ultra-separation of nickel from copper metal for the measurement of 63Ni by AMS. Nucl. Instrum. Meth. B 123, 230–234 (1997)
McAninch, J. E. et al. Measurement of 63Ni and 59Ni by accelerator mass spectrometry using characteristic projectile X-rays. Nucl. Instrum. Meth. B 123, 137–142 (1997)
Knie, K., Faestermann, T. & Korschinek, G. AMS at the Munich gas-filled analyzing magnet system GAMS. Nucl. Instrum. Meth. B 123, 128–131 (1997)
Rugel, G. et al. Accelerator mass spectrometry of 63Ni using a gas-filled magnet at the Munich Tandem Laboratory. Nucl. Instrum. Meth. B 172, 934–938 (2000)
Rühm, W. et al. Accelerator mass spectrometry of 63Ni at the Munich tandem laboratory for estimating fast neutron fluences from the Hiroshima atomic bomb. Health Phys. 79, 358–364 (2000)
Hashizume, T. et al. Estimation of the air dose from the atomic bombs in Hiroshima and Nagasaki. Health Phys. 13, 149–161 (1967)
Nakanishi, T., Imura, T., Komura, K. & Sakanoue, M. 152Eu in samples exposed to the nuclear explosions at Hiroshima and Nagasaki. Nature 302, 132–134 (1983)
Haberstock, G. et al. Accelerator mass spectrometry with fully stripped 36Cl ions. Radiocarbon 28, 204–210 (1986)
Korschinek, G. et al. Accelerator mass spectrometry with completely stripped 41Ca and 53Mn ions at the Munich tandem accelerator. Nucl. Instrum. Meth. B 29, 67–71 (1987)
Straume, T. et al. Use of accelerator mass spectrometry in the dosimetry of Hiroshima neutrons. Nucl. Instrum. Meth. B 52, 552–556 (1990)
Kato, K. et al. Accelerator mass spectrometry of 36Cl produced by neutrons from the Hiroshima bomb. Int. J. Radiat. Biol. 58, 661–672 (1990)
Rühm, W., Kato, K., Korschinek, G., Morinaga, H. & Nolte, E. 36Cl and 41Ca depth profiles in a Hiroshima granite stone and the dosimetry system 1986. Z. Phys. A 341, 235–238 (1992)
Straume, T., Harris, L. J., Marchetti, A. A. & Egbert, S. D. Neutrons confirmed in Nagasaki and at the Army Pulsed Radiation Facility: implications for Hiroshima. Radiat. Res. 138, 193–200 (1994)
Rühm, W. et al. The dosimetry system DS86 and the neutron discrepancy in Hiroshima—historical review, present status, and future options. Radiat. Environ. Biophys. 37, 293–310 (1998)
Arakatsu, B. Collection of Investigative Reports on Atomic Bomb Disaster 34– (Science Council of Japan, Tokyo, 1953)
Yamasaki, F. & Sugimoto, A. Collection of Investigative Reports on Atomic Bomb Disaster 18–19 (Science Council of Japan, Tokyo, 1953)
Gritzner, M. L. & Woolson, W. A. in US-Japan Joint Reassessment of Atomic Bomb Radiation Dosimetry in Hiroshima And Nagasaki-Final Report Vol. 2 (ed. Roesch, W. C.) 283–292 (Radiation Effects Research Foundation, Hiroshima, 1987)
Barnes, I. L., Garfinkel, S. B. & Mann, W. B. Standardization of 63Ni by efficiency tracing. Int. J. Appl. Radiat. Isot. 22, 781–783 (1971)
Marchetti, A. A. & Straume, T. A search for neutron reactions that may be useful for Hiroshima dose reconstruction. Appl. Radiat. Isotop. 47, 97–103 (1996)
Straume, T., Marchetti, A. A. & McAninch, J. E. New analytical capability may provide solution to the neutron dosimetry problem in Hiroshima. Radiat. Prot. Dosim. 67, 5–8 (1996)
Shibata, T. et al. A method to estimate the fast-neutron fluence for the Hiroshima atomic bomb. J. Phys. Soc. Jpn 63, 3546–3547 (1994)
Johnson, J. O. (ed.) A User's Manual for MASH v.2.0–Monte Carlo Adjoint Shielding Code System Report ORNL/TM/11778/R2 (Oak Ridge National Laboratory, Oak Ridge, TN, 1999)
Rose, P. F. (ed.) ENDF/B-VI Summary Documentation, Cross-Section Evaluation Group Report BNL-NCS-17541 (Nuclear Data Center, Brookhaven National Laboratory, Upton, NY, 1991)
Feldman, G. J. & Cousins, R. D. Unified approach to the classical statistical analysis of small signals. Phys. Rev. D 57, 3873–3889 (1998)
Acknowledgements
We thank I. Proctor and A. M. Kellerer for their essential support of this project. We also thank S. Fujita and K. Shizuma for providing copper samples for this study. We thank the following organizations for supporting this work: the US Department of Energy, the US National Academy of Sciences, the European Commission, the German Federal Ministry of Environment, Nature Conservation and Nuclear Safety.
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Straume, T., Rugel, G., Marchetti, A. et al. Measuring fast neutrons in Hiroshima at distances relevant to atomic-bomb survivors. Nature 424, 539–542 (2003). https://doi.org/10.1038/nature01815
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DOI: https://doi.org/10.1038/nature01815
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