se wr in pain aeiaaiainy~itSN Would you define the castun? LARSER:s That is practically all of the GI tract in the rabbit. The biologists object to calling it the GI tract. Now these figures ft am gutting on the board are disintegretions per minute, per 10) milicrams af ash. (chart should be used here) VOICES What was the initie) date? LARSEN Tt was Waroh 2, I believe. Sinee we weren't euch good markemen in September 'S1, I couldn't sample lungs. ‘The previow work has all been head shots. If you are dealing with a larger bomb end sore activity drops down here your activities are going to go up, but they still held thet same general picture. If you plot the decay curves aff say far exauplepfthe activity here and of this semple you would find that the elope of the activity will approximate the slope that 4s represented by this decrease. The half-life us was last teld or mentioned to me as about 32 dayn. I have some other things that, if I mey back up to what we were talking about this morning on particle sizes. It applies to what we are observing here in the lung. We were able to determine on a few of our air sazmplers this time the actual particle sige that was on the air path. This was done by a technique that wa have tréed to adapt to turbidimetric size anigsis on the actual mashbrane filter and we find that about fifty percent of the activity is DUE ARCHIVES , rf my y