Gamma exposure calculator, SCRATA Mk. VII

Pocket sliderule design. For calculating the correct exposure time for radiography with Iridium-192, Cobalt-60 and Ytterbium-169.

CAT. NO. 10.29.01

Exposure timers

Stopwatch

CAT. NO. 10.30.01

Digital Countdown Timer

CAT. NO. 10.30.02