-~ 19 - paper by Professor Donald P. Geesaman: ° aw ra tt So there is a hot particle problem with plutonium in the lung, and the hot particle problem is not understood, and there is no guidance as to the risk. I don't think there is any controversy about that. Let me quote to you from Dr. K. 2Z. Morgan's testimony in January ot © tnis year before the Joint Committee on Atomic Ener *, U.S. Congress. [a] Dr. K - 42. Morgan is one of e United States’ two members to the main .Comnittee ° the Intern2tional Commission on Radiological Prrotection; he nas been a member of the committee lonaa than anvone; and he is diractor or Health Physi 5 Division at Oak Ridge Ma tional paDorae | sory. I quote: “There are many tain Ss apout radi sion excosure w2 co not understand, and th x will con cnue to be uncarzainties until health physiics can provice This is whv a coherent theory of radiation damage. some of _sne Dasic researcn studies of the USAEC are so u. P. Geesaman and Tamplin nave pointes plutoniun- 239 vart ris x to 3 man WhO Car ~ a = OF ee eific activiity in hi: eS to the commit (t a bk er ht hg ct @ Fe om 1 InN urther yen NS cf upon us in ct it probably willl one of these along amount and on of tne anersy basic ael ivar ad smaller volume of tissue = This is anecna ay recipient. ction of how you calculate the ease I-- rh) 14.Q 0 3 rt Oe 0 Fey of tt a) of 1D bh re et vO Pe fc O ct He) HO. o O = ie uel = = particle." [5] He was 5 come up acain. Morgan, K. Z., “Radiation Standards for Reactor Sitins, ronm eanzal Effects of Producing Zlectrical Power in Environ Phase 2, 7 astimony presented at Hearings Détore tne Joint : En ergy, 9lst Congress, 1970. Commitcee on Atomic washingtsna., C., U. S. Government Printing Office. tre Lo] ne ct rte iD G oO vD t Panel Digcussion. j ft uy ia] 1970, Power, Joint In Phases Commi wasnington, D.