Product Description
Thoriated Glass Plano-Convex Lens Element from a Vintage Microfiche Lens in Display Case
Size: 15.9mm in diameter and approximately 3.3mm thick
Case Size: 41x41x16mm
Approximate Weight: 1.78 grams
This lens element was removed from a 23x microfiche lens barrel. The barrel is not normally included with this order, but if you would like one, please leave a note at checkout requesting it, and one will be included.
Th-232 is an optimal choice for calibrating Radiacode devices, as it offers the three calibration points required to calibrate at energy levels of 65, 583, and 2614 keV. We provide a procedure for Radiacode calibration using thoriated glass on our Blog.
Thoriated glass is a material used in the manufacture of optical systems, specifically photographic lenses. It is favored for this process due to its high refractive index. Thoriated glass is radioactive due to the inclusion of thorium dioxide, the oxide of the radioactive element thorium. It has since been succeeded by materials such as lanthanum oxide. Thoriated glass can contain up to 30% thorium by weight. Over time, thoriated glass develops a brown tint, which reduces transmission and interferes with neutral color reproduction; this tint can be removed by exposure to UV light.
Geiger counters and coin are not included.
NOTE: By purchasing this item, you agree that you have read our Terms and Conditions (which also serves as our Warnings and Notices).
