LI! BYs (continued) Problea of sanpling in the atsosphera is a very diffi One. ‘If we find that there is worldwide dissezination of fission products and particularly strontiva, it s to ae that 1t is extrenely likely that this waterial is transported above the weather layar in what you call the stratosghere. So we have to sazple it. #e have to te how much is up thore or we have to prove that it is up there. %e hava various ways of sarspling this, { think simplest thing 1@ to take soue rainwater saaples fros various parts of the earth's surface several aonths afte: any bozb has been shot. It seeas very likely and reason able to ae that aiy flasion products of strontius that get velow 30,000 feet where your rain ig scavenging the air all the tise will have been washed out rather quick if you can go te Southern Chile next Thanksciving and | a bucket of rain and find strontiws coming out of the heavens, I think it's very good evidence tiat you have strontium in the highest layers of the stratosphere and stratospheric transport. Put, regardless of what the {mplications are, if you find strontium coaing out in rain six months after any borb is shot this is an impo fact in itself. $ So thare's no doubt that we need to coliket rain sauples and to geasure them. fe need the ccean sacpies. because this is the next best eedius. How shall we meas the ocean, what shall we do about it? tell, strontiue is Densvt 73