@ ALCOby5 ama STANDARD FORM NO. 64 Office Memorandum e UNITED STATES GOVERNMENT TO FROM SUBJECT: SYMBOL: Howard Ce Brown, Jre, Executive Officer 26, 1951 DATE: Feb ' Division of Biology and Medicine Robert Le Butenhoff, Chief, Radiation Instruments Ea) Branch, Division of Biology and Medicine RESIME OF RADTATION TNSTRUMENTS BRANCH PARTICIPATION IN GREENHOUSE PROJECT Sel BMR:RLB R The necessity for testing AEC develoved instruments at Greenhouse made itself evident during the early part of 1950. Primarily, it was felt that field tests on instruments being developed by AEC for possible civil defense use were required which would include tests on both dosage~rate and dosimeter instrumentse Secondly, a field evaluation of the AEC Emergency Monitoring Team Kits was felt necessary in order to determine the adequacy of the instruments and equipment in these kits for emergency monitoringe In connection with this evaluation, information is required on the importance of measuring alpha and beta radiations as compared to the current idea that the measurement of gamma radiation is all that is requirede The spectral dependency of instruments is also of interest and it is important to determine the effective energy of the gamma radiation of the residual and scattered radiation as there is some evidence that this may be well below 200 Keve Thirdly, participating in Greenhouse would provide valuable information on the serviceability and maintenance experience of health physics monitoring instruments. The information obtained would be used to direct the future imrovement and development of instruments for use within the AEC installationse ' The need for these tests was discussed with John Derry and upon his recommendation, I visited Lt. Commander Victor Delano at Los Alamos who is the Program Director in charge of the field evaluation of radiation detection instrumentse As a result of this visit, a proposal was submitted to Delano which recommended the extension of Project 5el1 to include the Radiation Instruments Branch of the AEC as one of the collaborating agencies in that projecte This proposal was approved. As you may know, Project 51 was originally established for the purpose of testing Army and Navy field radiological monitoring equipmentse The Signal Corps! Engineering Laboratories and the Army Chemical Center will have the responsibilities within the Army and SLASSIFICATION + cANCELLED SAT ORGY OF BGEI *5650, 2 ai1/2. ToseDiaz.talc3) Wildur A. sTRRUSER 4-21-71 By:Dik KooGLe b-8-¥9 agetingare my / hy ON —— oe TO ARCHTVsu