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...Autoradiography dr ruchika yadu introduction is the bio analytical technique used to visualize distribution of radioactive labeled substance with radioisotope in a biological sample it method by which material can be localized within particular tissue cell organelles or even biomolecules very sensitive and being wide variety experiments although locate substances also for quantitative estimation using densitometer history first was obtained accidently around when blackening produced on emulsions silver chloride iodide uranium salts observed niepce de st victor experiment involving traced polonium specimens development as really started happen after world war ii photographic then stripping made halide radioactivity now no longer property few rare elements minor interest such radium thorium any compound isotopes opening up many possibilities study living systems principle based upon ability expose film ionizing this put direct contact thick layer emulsion thickness mm having gelatin crys...