“…Surface counts were made over the heart, liver and spleen, and the excess counts over the liver and spleen were calculated as described by Hughes Jones and Szur (1957) and by Lewis et al (1960), but the results were presented on a percentage basis (Hindawi and Subhiyah, 1962). In normal subjects at the time when half the chromium had left the circulation, the excess liver count is below 20 per cent, whereas the excess spleen count is below 35 per cent.…”