a ame let Stee ween Cele ale Peet Waar aeonsMichad INTRODUCTION Every three months, the Health and Safety Laboratory issues a report summarizing current information obtained at HASL pertaining to fallout. This report, the latest in the series, contains information that he- came available during the period from December 1, 1969 to March 1, 1970. Preceding The next report is scheduled for publication July 1, 1970. reports in the series, starting with HASL-42, "Environmental Contamination from Weapons Tests", and continuing through HASL-224, (this report) may be purchased from the Clearinghouse for Federal Scientific and Technical Information, National Bureau of Standards, U. S. Department of Com- A complete listing of these Fallout merce, Springfield, Virginia 22151. Program Quarterly Summary Reports is given on the title page of this report. To give a more complete picture of the current fallout situation and to provide a medium for rapid publication of radionuclide data, these quar~ terly reports often contain information from other laboratories and programs, some Of which are not part of the general AEC program. To assist in developing, as rapidly as possible, provisional interpretaticns of the data, special interpretive reports and notes prepared by scientists working in the field of fallout are also included from time to time. Many of these scientists are associated in some way with the general AEC program. Information developed outside of HASL is identified as such and is gratefully acknowledged by the Laboratory. In this report, data from the EURATOM Joint Nuclear Research Center at Ispra, the Division of Radic- logical Physics at Argonne National Laboratory, the National Radiation Laboratory in New Zealand and the Department of Scientific and Industrial Research in New Zealand, are given. A portion of the radiochemical analyses either have been or are being Carried out by commercial laboratories under contract to the HASL Environmental Studies Division. The results of these analyses are repor~ ted as part Of HASL's regular fallout program. The contractor analytical laboratories which provided data are Nuclear Science and Engineering Corporation, Pittsburgh, Pennsylvania; Isotopes, Inc., Westwood, New Jersey; Radiochemistry Incorporated, Louisville, Kentucky; Tracerlab, Division of LFE, Richmond, California (now Trapelo Division/West); Controls for Radia- tion, Inc., Cambridge, Mass.; Hazleton-Nuclear Science Corporation, Palc Alto, Califf'.; Food, Chemical and Research Laboratories, Inc., Seattle, Washington; Tracerlab, Division of LFE, Waltham, Mass: U. S. Testing Co., Inc., Richland, Washington, Custom Nuclear Co., Mountainview, California. and Ledoux and Co., Teaneck, New Jersey. This report is divided into four main parts: 1. 2. 3. 4. Interpretive Reports and Notes HASL Fallout Program Data Data from Sources Other than HASL Recent Publications Related to Radionuclide Studies pee. - viii nr. SF ET A TE TEE a Oe ea od * oo. i eoUF Fe