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STS-48 Mission Specialist (MS) Charles ``Sam`` D. Gemar, on the middeck, consults the Payload Operations Checklist for procedures regarding the Shuttle Activation Monitor (SAM) experiment. SAM is designed to measure gamma ray data within the orbiter as a function of time and location. Gemar's experiment activities aboard the earth-orbiting Discovery, Orbiter Vehicle (OV) 103 were documented using an Electronic Still Camera (ESC). Crewmembers were testing the ESC as part of Development Test Objective (DTO) 648, Electronic Still Photography. The digital image was stored on a removable hard disk or small optical disk and could be converted to a format suitable for downlink transmission.