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To the Editor:—
The expression used in my paper to correspond with a statement made in Dr. Lewis' paper involves the combination of words, "2 × 10-6 per rad per year."Without previous knowledge or associated context this can be read either (a) (2 × 10-6 per rad) per year, or (b) 2 × 10-6 per (rad per year).Avoiding any discussion of the meaning of rem (used by Dr. Lewis for the combined neutron and gamma dose), it is obvious from the context of Dr. Lewis' paper and from my paper that both authors mean the first parenthesization (a), as the rad (or rem) dose refers to an acute dose.The sentence in my paper referred to by Dr. Caretta appears to be based on parenthesization (b) and it seems that no parenthesization would give it a meaning based on (a). The "per year" should be
Lawrence JS. Irradiation Leukemogenesis. JAMA. 1965;192(7):647. doi:10.1001/jama.1965.03080200065033
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