re Sn. sh Bas 296 RADIATION STANDARDS, INCLUDING FALLOUT I am also an associate professor of industrial medicine at the New York University Medical Center where I give a course on the introduction to radiological health and participate in several other courses covering the subject. I was not certain whether this information was of interest or value to you and also whether my activities would be considered an activity in the medical profession, Sincerely yours, Hanson Bratz, Director. Representative Price. Thank you, Dr. Chamberlain. The committee is happy to have your fine paper. May I commend you on the effective summary which you gave. You touched on every point in your statement which I followed through as you wenton. Doctor, you state on page 1 of your formal statement that during the past 2 years much thought and effort has been expended on radiation appraisal. What has occurred inthis field that has brought about suchan intensive effort ? Dr. CHamperuain. In the last 2 years particularly you mean? Representative Price. Yes. Dr. Caamper.ain, I think that it really dates from 5 years ago, sir, but one of the influences onthis, I imagine, is the former hearings of this group itself. The interest in the medical profession has been rising for about 3 years, after the National Academy of Sciences report, to a crescendo which has been most active during the past 2 or 3 years. I think the international commissions and the National Commission on Radiation Protection also have been in great part responsible forthis. Representative Price. On what criteria are you able to make the assumption that you make on page 2 that the average patient dose in the United States would be about the same as in countries where it has been surveyed ? Dr. Cuampernain. There are two things involved in this: I personally have traveled extensively anu have been a visiting professor at such places as the University of Lundin Sweden. Ihave had interchange with other Western civilized countries to see what they do and howthey doit. I think in general our medical practice is quite comparable to Sweden and United Kingdom and not greatly different from the Netherlands and parts of Western Germany. There are some differences that are important, but they probably are less important than the uncertainties of the earlier estimates that were made in those countries and in our own country as to this medical amount. As I say, I simply don’t know what the figure is, but I think there is good reason to think that these studies which have been carefully done in the other countries, with a roughly comparable extent of radiological expertise, would make us think that we are probably within the same ballpark at least. Representative Price. What was the impetus in these studies in the countries that you have mentioned ? Dr. Curampertaty- What made them do the studies originally ? Representative Pricx. Yes. Dr. Cusmperiary. I don’t really know exactly except that this increase In interest in radiation exposure has been general, and, as I say, the International Commission on Radistogieal Piotection has been particularly active in promulgating this and also the rules by which suchstudies ought to be done. b BRBTATBIEEINTcoveitnlemiasttapmisguntindpie 6