Sequence showing two biologists walking among young pine trees. MS of one biologist holding geiger counter to trunk of tree. CSs and CUs of second man digging ground sample while first man holds geiger counter to it. CUs of faces of men, one is wearing earphones of geiger counter. MS of the two men walking on path near sign reading "Radioactive experiments - Keep away". MS of Mrs Bélanger working in biological laboratory at University of Ottawa. CS and CU of Doctor Bélanger of University of Ottawa studying specimens through microscope. CS of technician weighing specimens and writing down data, filmed through scale.