.,! /“ Dr. Robert A. Conard -2- June 19, 1975 AS you know, all of the foregoing discussion pertains to our particular measurement system using an array of thin crystal Phoswi.Ch detectors posi~ioned about the head in a geometry specific to these counting techniques. Furthermore, all of the foregoing measurements were performed inside of our whole-body counter facility. I do not know what the background would be aboard ship, however, our familiarity with this detector system has pr,oven to us that these ‘thin crystal detectors are quite directional in response “and, therefore, can easily be shielded by “shadowing” techniques. We would be interested in assisting you with these measurements and are eager to take an active part in this area of your future proposed measurements. Please let me know if you require additional specifics including budgetary We look forward considerations and man-time expenditures. to continued cooperation. Norman, Cohen, Ph.D. Assistant Professor NC/fl cc: Dr. Stanton Cohn Dr. Merri.1 Ei.senbud Dr. Gerard Laurer