half-life, and is persistent in the environment. Since cadmium is concentrated in the liver and kidney of man, the radiological significances of Ni3m, should be carefully evaluated at Bikini, Enewetak, Rongelap and Utirik Atolls. Additional cadmium measurements in the environment are needed since we have little information concerning this element. There may be less obvious radiological pathways to man that could require evaluation. For example if the non-edible parts of fish of marine origin (gut contents with high concentrations of plutonium), are indiscriminatley recycled to the terrestrial environment, the levels of transuranics could be increased near future village or residence areas by refuse disposal. Thus, there may be other pathways yet to be identified which could require evaluation. D. Radiological Dose Assessment and Risk Analysis 1.) Data Reduction The reduction and evaluation of the data derived from samples collected at the atolls (see Section 5B) should be carried out in the dose assessment program. The data must be screened and evaluated and put into a format to be coordinated with other parameters in the dose assessment models. Data reduction and evaluation is a very critical phase of a dose assessment and a task that requires continual effort, not only to keep the data base updated for the assessment work but to evaluate the data in many ways to help define and focus additional field work, to determine environmental residence times for the radionuclides and to evaluate remedial measures. A most important factor in data reduction is the development of a computerized data bank (see next section D2). 42