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In the next to the last paragraph of the summary of the article by Scheele and Cowie in The Journal, August 23, on page 590, the statement regarding calibrations should have read "Calibrations were too infrequent in many hospitals to permit accuracy in the calculation of doses given to patients."
Radiation Protection in Forty-Five Hospitals. JAMA. 1941;117(11):947. doi:10.1001/jama.1941.02820370043018
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