Mr. Hal Hollister 3 October 6, 1978 from inhaled plutonium, the possibility remains that plowing could increase the availability of 9°Sr and }37Cs to plant roots. The Advisory Group will wait until comparative data are available on the levels of ?9Sr and 137Cs in plowed and unplowed soil before commenting further on plowing. Dose assessments for the two conditions would be especially useful if ?°Sr and 137Cs, as well as the transuranics, were considered. Sincerely yours, W. Jd. Bair, Ph.D. Manager Environment, Health and Safety Research Program WJB:ms cc: Madaline Barnes ——