of Radiation Therapy at UC San Francisco. I worked there for several years on detached duty before I resigned from the Service; Dr. Stone had offered mea job in the Radiological Laboratory which I accepted. At that time they had just finished the Radiological Laboratory building which was to house the synchrotron, a 70 MeV machine. I was to determine the radiobiological effectiveness (RBE) of its x-ray beam. That's aboutall I can say aboutthat. I hope your other interviewees talk more than I do. BERGE: Some do, some don't. Can you describe, did you only work on the on the RBE? KOHN: No, I had an X-ray machine at mydisposal, and I, therefore, did a variety of experiments with the X-ray beam on rats, but especially on mice. BERGE: What was the advantage of mice overrats? KOHN: They're smaller. You could have more of them in the laboratory. BERGE: And what happenedafter you were there for a couple of years and then left? KOHN: Well I wasthere from,let's see, I went to Oak Ridge in 1947. That's all on that C.V. there, and then I stayed at the Radiological Laboratory in San Francisco from 1949 to about 1962 or 1963. Well we did a variety of experiments, and I did some work on patients.