~ 31 logically, merely by the terms used for the units of measure- ment in describing the amount of radioactivity present. example, For to say that the amount of radioactivity from naturally occurring radioisotopes in the body of a 170pound man is about one-half a million disintegrations per minute is more alarming to some people than to say that it is one-fourth of one one~millionth of a curie. As the units of measurement of radioactivity become better known, a better understanding of the hazard associated with radioiso- topes can be expected. The standards of radiation protection can be expected to change as more accurate information is acquired on the factors upon which the standards are based and as the opinions of those who have the responsibility for establishing the standards change with time. (ibid) In evaluating hazard, Dunham makes the following statements: The important considerations are that (1) we bring to bear on the problem all of the information that can be made available; (2) we take maximum advantage of the combined judgment of able and well-informed persons; and, (3) we, as a people, understand the general nature of any standards which may be recom-