SECRET = PROGRAM 2 Project 2.1 — Gamma Exposure vs Distance - Peter Brown ~ ESL 2.2 — Gamma Dose Rate vs Time The objective of 2.1 is to measure the total gamma dosage from the initial and the fallout radiation. We will use film badge techniques and, in the cases where there my be neutrons present since these do affect the film, we will use ionization chamber types of dosimeters as backups. The calibration source that we use here will be a 200 curie cobalt 60 source, and I would like to know where I can put it. Maybe Rad-Safe can help me out. In addition to those two techniques, we will probably use phosphate glasses to measure the very high rates in close to large weapons or large devices, The objective of 2.2 is to measure the gamma rate va time at various locations. We will measure the fallout gamma rate with ionization chamber types of instruments located at various spots on Bikini and possibly on one or two of the shots at Eniwetok. I do not kmow if that is firm as yet. The initial or one of the main things we want to do on the fallout station is to measure the decay rate. We will measure the initial gamma rate on the large devices at Bikini, using a scintillation type detector that is a phosphor and a photomultiplier tube, We will use light to calibrate these to very high levels and will use cobalt to calibrate these to the very low levels. We will probably have about 18 people in the FA for the two projects combined. We will have a variable photo dosimeter processing laboratory, probably located at Eniwetok. Any questions? Q: Yes sir; Where will your initial stations be on Bikini? A: We are going to locate them as close as a mile, and probablyanything beyond three miles would not give us much information. I realize the risk. This makes three probably on Able, Tare and Charlie; in other words, I think there is going to have to be an artificial built-up combined station at Charlie for the Chemical Corps and our projects. Qs: How about your fallout stations? A: These will be about 20 in number with the Chemical Corps layout; they will be at various locations on the Bikini Atoll ~- probably around Dog, Nan, and those islands in the lower left portion of the Atoll, Q: Are your projects participating in all shots? A: No sir; the large shots on Bikini and the air drop are the most important on the initial, and the small shots at Eniwetok which are too large to be held at Nevada will fill in the gaps in information not now available, h uaLR