radiochromatography

noun

ra·​dio·​chro·​ma·​tog·​ra·​phy ˈrād-ē-ō-ˌkrō-mə-ˈtäg-rə-fē 

plural radiochromatographies

: the process of making a quantitative or qualitative determination of a radioisotope-labeled substance by measuring the radioactivity of the appropriate zone or spot in the chromatogram

radiochromatographic

-krə-ˌmat-ə-ˈgraf-ik, -ˌkrō-mət- 

adjective