Researchers test for radiation at Nevada Proving Ground during atomic testing

LS fiery mushroom cloud ascends into sky during atomic explosion, tracers from warning flares in background / VS men position instruments aimed at sky / MS men silhouetted against background with rising smoke plume / WS-PAN RIGHT helicopters hover above desert landscape / MS helicopter hovers just above ground as researcher measures radioactivity with Geiger counter / LS researcher walks around with Geiger counter, house and mountains in background / MCU researcher in gas mask with Geiger counter / MS researcher with Geiger counter tests area around army tank / LS house sits in desert, mountains in background / LS car sits in desert, mountains in background / LS beauty shot of desert with cactus trees, clouds above and mountains in background / LS fiery mushroom cloud ascends into dark sky / LS mushroom cloud ascends and billows in desert sky / Note: exact day not known