That radiation in its many forms is of great value to man is not debatable. Similarly, that radiation can be received by man in harmful amounts is not debatable. The question as to whether or not there is some level of radiation exposure below which impairment will not result to man is most decidedly debatable; and, despite the enormous effort that has been directed to this point, there is no essential knowledge today which was not available ten years ago and which will lead to a specific answer to this question. It is therefore assumed with great prudence, but without proof. that any unnecessary exposure of man to radiation must be considered as harmful. Again, the degree of harm is completely undefinable for the levels of radiation to which tens of thousands of radiation workers have been exposed for the past several decades; its deleterious effects on the human system are yet to be proven.

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