This investigation was undertaken to determine the comparative biologic value of radiations from different kinds of lamps. Since the antirachitic effect of radiation has been more thoroughly studied and more accurately standardized, it was decided to use the rachitic rat as an indicator. Since the total reaction obtained varies somewhat with different rachitogenic diets, it seemed desirable to make simultaneous studies on groups of rats fed different diets. Accordingly, the Steenbock 2965 and the McCollum 3143 rachitogenic diets were selected as the ones probably most widely used.
Six series of experiments are reported. In series 1 only the Steenbock diet was used; in series 2 only the McCollum diet. In all other series duplicate tests were made with each diet.
In some of the experiments the line test was employed as a check on the roentgenographic readings, but it was found that there was generally such close agreement that the
REED CI, BACHEM A. ANTIRACHITIC EFFECTS OF RADIATION FROM DIFFERENT SOURCES: A COMPARATIVE STUDY. Am J Dis Child. 1935;50(1):11–27. doi:10.1001/archpedi.1935.01970070020002
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