Shots of woman technician at work, placing radioactive substance into lead vault, adjusting gauge. CU of flashing lights of dial. CU sequence showing gloved hands handling radioactive substance using forceps, placing it and removing it from cylindric lead containers. CU of meter. CS of woman technician at work on device determining radioactivity of substance in vial. CU of sign re maximum working time, TILT DOWN to feet of man wearing protective shoes. MS of man technician at work with device on counter. ECU sequence on gloved hands handling radioactive substance, substance being dosed and placed in vial, of substance being droped from measuring tube onto glass disc on table.