Q: \ | within about 10%, om —_ Did you say a helicopter would be as low as 5: over the island? A: No. They will fly at a 1,000’, but a probe will be lowered to the ground and a timing switch will indicate when the probe touches the ground. Project 2.6.6 = Early Cloud Penetration = Col #. A. Pinson = AFSW The purpose of this project is to determine the radiation dose rate and integrated radiation dose which air crews might receive in flying through the clouds from Mt yield weapons at various times after detonation, This project has been undertaken as a result of a requirement established by the USAF and SAC. We think that the resuits that we hope to get will be equally applicable to other operational air commands. The aircraft which we hope to get for this project is the B-57B aircraft, a two place aircraft with an altitude capability in excess of 50,000'. We will have numerous types of instrumentation on this aircraft. We hope to haveat least two, possibly three, independent, automatic recording dose rate meters on the aircraft in addition to a half-dozen types of integrating dosimeters on the aircraft. We expect to participate in all of the Mt yield shots, the five largest. The altitudes at which we wilt operate will be from 30 to 50,000', at times which we now think will range from 30 minutes to 90 minutes. We will employ two types of maneuvers in these penetrations. (Cne, which we call the nip, in which we go into the cioud a reasonable distance, let's say a halfmile or so and back out as quickly as possible. Another type of penetration, which we call a bore-thru, where we will go directly thru the cloud. In the first shot that we participate in, in order to inject as much safety into the operation as possible, we shall make penetrations at the later times that I have indicated, and with the nip type of penetration which will keep us in the cloud the least amount of time. We expect to have approximately 12 technical people in the FA in addition to the people who fly and maintain the aircraft. Q: Any questions? Will you have to have any special radiation dose in order to make penetration? A: Yes, sir. We would have to have a special radiation dose in order to enable us to make penetration at the times which will be useful to us; and one of the. problems we have with this type project is getting the approval of an established dose greater than let's say 3.9 R, SAC has asked for bore-thru type penetration which would net up to 75R, We have consulted with them and we were understandably hesitant to make penetrations at this time in keeping with the uncertainties of the dosage that one can get from a project of this sort. Ithink we can appreciate, from the TEAPOT work, error factors of up to three times are quite possible and if you multiply 75 by 3 you have got quite a dose. We talked with SAC about this and they, I think, would be satisfied if we could make penetrations up to the point where bore-thru penetrations would net 25 to 5CR, In keeping with this, we will request approval for a 25R upper limit for our aircrews and perhaps a 5CR limit on not more than six aircrew members, ~ 326 LANL RC ——S re Cod