Dr Koop [stamped, NOV 19 1971] Radiation NEJM 784:386. 2/4/71 Do you know of any other studies on cost-effectiveness of radiography? Isn't it worth 5000 dollars (l/34 X-rays to find a fracture not otherwise detected? On the other side, how many genetically and cancer-significant rems are also involved. (at 100 dollars/rem does this change the calculus?