surrounding tissue (roughly 10 rem/yr). C Werpons Test Tallout Another source of human contamination that is suggested as being pertinent to this problem is the plutonium in the fallout from nuclear weapon tests. weapon tests is incorporated in or deposited on particles that contain other materials and, workers, The plutonium from like that for the Manhattan the specific activity in these particles is much smaller than that in hot particles. VII Exposure Standards for Hot Particles Thus the existing bidlogical evidence strongly suggests that an insoluble particle of Pu-239 deposited in deep respiratory tissue represents a risk of cancer induction between 1/1000 and 1/10,000. Prudent public health practices should assess the risk associated with environmental plu, tonium and establish exposure guidelinds on the basis of these probabilities. The existing standards for uniform radiation exposure of the whole body or lung can be used as the basis for establishing particle exposure standards by equating the risk of cancer induction between the two tyves of exposure (uniform vs. grossly non-uniform). The most recent assessment of the risk associated with uniform irradiation of a 5 1 ate of : reese an a ee : . . te or tye Pee toy “. mA. ' ee Seen us. . Sy a at : aM:“y me - et OS, we . - or an *