H16 Hopewell, J.W. The importance of vascular effects in the development of late radiation damage, p. 680-687 in Radiation Research (S. Okada, M. Imamura, T. Terasima et al., eds.). Toppan Printing Co. Tokyo, 1979. HIT Hart, R.W. Role of DNA repair in aging, p. 537-556 in Aging, Carcinogenesis and Radiation Biology (K.C. Smith, ed.). Plenum Press, New York, 1976. I1 International Commission on Radiological Protection. Radiosensitivity and spatial distribution of dose. Report prepared for Committee 1 of the International Commission on Radiological Protection, ICRP Publica- tion 14. Te 13 J1 Pergamon Press, Oxford, 1969. Ilbery, P.L.T. Prevention of radioleukaemia by lymph node shielding. Nature 215: 655-656 (1967). Tberall, A.S. Quantitative modelling of the physiological factors in radiation lethality. Ann. N.Y. Acad. Sci. 147: 1-81 (article 1) (1967). Jee, W.S.5., D.R. Atherton, F. Bruenger et al. The current status of Utah long-term Pu-239 studies, p. 79-94 in Biological and Environmental Effects of Low-Level Radiation, Vol. II. Vienna, 1976. J2 Johnson, H.A. IAEA publication STI/PUB/409. Age and sensitivity to radiation life-shortening. Radiat. Res. 23: 19-25 -(1961). J3 Jones, D.C. and D.J. Kimeldorf. Ju Jones, D.C., G.K. Osborn and D.J. Kimeldorf. Influence of age at exposure on some persistent and late effects of irradiation with fast neu- span in the male rat. trons. JD Effects of age at irradiation on life- Radiat. Res. 22: 106-115 (1964). Radiat. Res. 34: 637-647 (1968). Jablon, 5., M. Ishida and G.W. Beebe. Studies of the mortality of A-bomb survivors. II. Mortality in selections I and II, 1950-1959. Radiat. Res. 21: 4e3-hu5 (1964). J6 Jablon, S., M. Ishida and M. Yamasaki. Studies of the mortality of A-bomb survivors. B. Description of the sample and mortality, 1950-1960. Radiat. Res. 25: 25-52 (1965). JT Jablon, S. and H. Kato. Studies on the mortality of A-bomb survivors. V. Radiation dose and mortality, 1950-1970. Radiat. Res. 50: 649-698 (1972). K1 Kohn, H.I., R.F. Kaliman, C.C. Berdjis et al. Late effects of whole-body X-irradiation in the mouse. Some gross and histologic aspects of the development of morbidity prior to terminal state, with special reference to gonad, uterus, heart, liver, kidney and submasillary glands. Radiat. Res. 7: 4o7-435 (1957). Ke Kaplan, E. and P. Meier. vations. Nonparametric estimation from incomplete obser- J. Am. Stat. Assoc. 53: 457-81 (1958).