The present system could quality and LET; in principle obviate the need t ftfLeld quantities; a “Standard radiation”, c2diatioa linear “dose effect” and “dose response” relationship; ciskx coefticients; 3254; equivalent and cem. accurately Che The problem of cadfatiton tield difficult, whether one uses ovtataine meusurements that cepresenut in tissues and cell populations the current SE or is sf course the proposed £5 approaches. A rather far-reaching conclusion is nossidle with the vroposed Each relevant organ system in the body contains enormous auabers of cell alements. possible, With the proposed approach embracing with any exposure, individuals have approximately in principle, «> we thea for a given exposure, a population of individuals these numbers can transformea cells. With a graded series of then be correlated with cancer ftucidence, which can be evaluated only long after the exposure, beings. e Assuming all exposed noraal the same number of relevant cells, with known and equal numbers of exposures, - to estisate the (fractional) nunber sof transformed cells in the individual. can have, tne NSEr, ye approach. dose in aninals cr in heaan The result would be a function for cancer risk as a function of the number of transformed cells inthe individual,to reolace the currest organ dose-cancer incidence function. The significance of system, cancer the above is perhaps one can derive only a quite uncertain estimate from a physical quantity, and equivalent in very large populations individual. individual, obtained. one must use the to evaluate the of in the preseat the risx of collective lose risk of cancer in te On the other hand, with the proposed system, one has a neasure of actual effeccr, vs. substantial. i.e., the fraction of quantally responains celis, from which the cancer risk tailored to that individual can te In other words, the function for the probability of an eftect the amount of exposure may in princisle be by-passed completely. one has in the in principle removed the evaluation of Thus risk from the realm of Ph in which the focus is offictally Limited to the health of the populacion or society, health of and placed it in the Md category, the individual person. buc in the medical, social ana legal With respect to the probab{liry of causation ( 1? SOG 14 bb focus is oa the This may have many iuaplications, not only in radiation biology and protection, spheres as vell., in which the ), it