[eon s " BEY s *- _ . Any one else have a question for Mr. Marshall? Before leave the sampling program, I'd like to mention a subject! Colonel Holsman is connected vith. which Several veeks ago ve considering this stratospheric storage, and concinded then as - we did this morning, that it probably exists, that there probably a lot of radioactivity in the high layers of atmosphere, ani the question is how te prove this. It obvious from remarks this morning that rainstorms and vagaries of weather make the assay of rains a rather um ble way of establishing it quantitatively. So we wonder how RB Peds sexple the high atacsphere and get senples dove vhich giv poms qualitative notion cf the content cf radleactivity. are two aspocts -- cne is to get up there, and the other [ get the radioactivity out of the air. We asked Colonel to make some measurenents on jet afroraft which are ope! Me out of Kirtland, and I'd like to give him a couple of nis to tell us about that. eS ltr ony | I knoy these data are very poor, ftut there ie some radicactivity on these airplanes, and as I understand it, they vere not in any etonio cloud that knew off ROLZMAN s | That's right, Dr. Libby. About a month or so ago, Dr. ladty requested just a yes-and-no answer as to whether any of jets were picking up any radicsctivity. So we ran a "qu and-dirty* test on this. There were about fifteen aircrafts Ve made sure that the alroraft wers rct these which nighh have e ‘77