MONTHLY STATUS AND PROGRESS REPORT Division of Biology and Medicine MES ri a “ef =B= Oy = Copies,. Series “f__ Ec. MONTH OF JANUARY 195) Weapons Test Activities - Monitoring Program for Operation CASTLE. QB rogram been completed for the operation of a world-wide monitoring _to measure and collect radioactive ‘fall-out during the forthgoming test series in the Pacific. A network of 150 stations has bden estab- lished throughout the world, with concentrated networks in the United States and in the Pacific near ground zero. Autogatic, Kusaie, Rongerik, Majuro, Truk, Yap, Wake, Iwo Jima, Midway, and Guam. Monitoring of these islands during past test seri¢s showed of air-borne scintillation instruments. Based on the findi ground monitors, negative flights may be eliminated and fli rescheduled to operate more effectively. Collections of f rial will also be made aboard severai hundred United States traveling the North Pacific ocean routes. This will permit of fall-out which is carried by winds to the open sea. The areas of the Pacific Islands in relation to open water make to predict the fall-out patterns accurately, and observatio open ocean areas will yield more complete information. Procedures for monitoring radioactivity were initially by the Commission in 1951 in the northeastern states during test series. In 1952 the program had been expanded from a network (TUMBLER-SNAPPER series) to a world-wide network operation during the IVY and UPSHOT-KNOTHOLE series. A ske is maintained continuously between test series. The monito whi was in ton network program provides the Commission with documentary evidence concerning the amount — and distribution of fall-out from nuclear weapons tests for use in evaluating radioactive contamination for immediate, as well as long- . range, effects. DEPARTMENT OF ENERGY DECLA SIFICATION REVIEW SINGLE REVIEW AUTHORIZED BY: DETERMIN TION {CIRCLE NUMBER(S)} rf] Ge +. CLASSIF ATION RETAINED / 2. CLASSE TION CHANGED TO: This document 2 -% : : Re te Ot in the iter nora ic E wo ee pipe acy cr to 7 (a : “ eres zt C2 Dees Te ett it teal Te ns eR ee Bet pm moe om enews vere Aner REVIEWER i NAME: 7 DATE: . 3. CONTAMMES NO DOE CLASSIFIED INFO * Ab COORDIBATE WITH: CLyyntZ SACLASSIFELATION CANCELLED CLASSIFEED {NFO BRACKETED 7. OTHER (BPECHFY): . FE ARCHIVES /34L—“7