ments can be determined (for example, ref. 20). Eventually, it is anticipated that the logistically difficult in situ
approach will be completely superseded by direct measure-
ments of radiation incident on representative individuals
in their daily rounds.
Wethank our colleague, H. L. Beck, as well as several
Health and Safety Laboratory summerstudents, including
J. Grebowsky, H. Grotch and I. Hammerman, for their
assistance with the outdoor survey.
A. Spiegal carried
out the indoor measuremonts. Many helpful discussions
have been held with Dr. A. Segall of the Harvard School
of Public Health, who co-ordinated the various parts of
the New England survey and who kindly supplied the
dosimeter results.
We also thank J. E. McLaughlin,
director, Radiation Physics Division, Health and Safety
Laboratory, for his advice and support.
1 Segall, A., Setence, 140, 1337 (1963). 2 Lowder, W. M., Segall. A., and Condon, W. J., in The Natural Radiation
Environment, edit. by Adams, J. A. 8., and Lowder, W. M. (Univ.
Chicago Press, 1964).
* Segall, A., and Reed, R., Arch. Env. Healfh, 9, 494 (1964).
‘Condon, W. J., Lowder, W. M., and Beck, H. L., Health and Safety Lao.
Rep. (to be published, 1965),
5 Billings, M. P., Harvard Univ. (unpublished results).
* Spiers, F. W., App. D, in The Hazards ta Man of Nuclear and Allied Radiations; A Second Report to the Medical Research Council (H.M. Stationery
Office, London, 1960).
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"Spiers,F. W., McHugh, M. J.,and Appleby, D. B..in The Natural Radiation
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*Halm, E., Herbst, W., and Mastrocola, A., Sonderdr, aus Beilage B., No.
6/1962, zum Bull. des Kidg. Gesundheitsamtes (Dec. 22, 1962).
‘Spiers, F. W., and Overton, T. R., Phys. Med. Biol., 7, 35 (1962).
10 O’Brien, K., Lowder, W. M., and Solon, L. R., Rad. Res., 9,216 (1958).
4 Lowder, W. M., Beck, H. L., and Condon, W. J., in The Natural Radiafion
Environment, edit. by Adams, J. A. S., and Lowder, W. M. (Univ.
Chicago Press, 1964).
12 Lowder, W. M., Beck, H. L., and Condon, W. J., Nature, 202. 745 (1964).
18 Beck, H. L., Condon, W. J., and Lowder, W. M., Health and Safety Laboratory Report HASL-150 (1964).
14 Beck, H. L. (to be published, 1965).
16 Lowder, W. M., Beck, H. L., and Condon, W. J. (to be published, 1965).
1¢ Roesch, W.C., MeCall, R. C., and Rising, F. L., Health Phys.,1, 340 (1958).
17 Segail, A-, Shapiro, J., and Worcester, J. (to be published).
18 Rep. UN. Set. Comm, Effects of Atomie Radiation (United Nations, New
York, 1962, App. #).
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29 Roser, F. X., and Cullen, T. L., Science, 138, 145 (1962).
1 Henson, P. W., Phys. Med. Biol., 8, 423 (19638).
*2 McLaughlin, W. L., J. Phofogr. Sci. {to be published, 1065).
22 McCall, R. C., and Fix, R, C., Health Phys., 10, 602 (1964).
2! Blase, Ek. F., Logerquist, BR. F., Palmer, 8. C., and Rutland, PD. F., Health
Phys., 9, 888 (1963).
** Cullen, T. L. (personal communication, 1964).
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