Spot Markers / Disc Sources

NMT’s Spot Markers are reference sources only and manufactured by gravimetric transfer of Co-57 and sealed with epoxy.  Activity content is verified by ion chamber for content.

This traditional Lucite marker has a total diameter of 1.0 inches (2.54 cm), an active area of 0.125 inches (3 mm) and a total thickness of 0.25 inches (6.4 mm).

The Cesium marker has a total diameter of 1.0 inches (2.54 cm), an active area of 0.25 inches (6.4 mm) and a total thickness of 025 inches (6.4 mm).