Thoriated Glass Plano-Convex Lens Element from a Vintage Microfiche Lens in Display Case
Size: 15.9mm in diameter and about 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, leave a note at checkout requesting it, and one will be included.
Th-232 is an optimal choice for calibrating the Radiacode devices as it offers the three calibration points required to calibrate at the energy levels of 65, 583, and 2614 keV. We provide a procedure on Radiacode calibration using thoriated glass on our Learn page: .https://geigercheck.com/learn/
Thoriated glass is a glass material used in the manufacture of optical systems, specifically photographic lenses. It is useful 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 therefore been succeeded as a material of choice for the glass including lanthanum oxide. Thoriated glass can contain up to 30% by weight of thorium. Thoriated glass, over time, develops a brown tint, reducing transmission and interfering with neutral color reproduction. The tint can be removed with exposure to UV light
Geiger counters and coin not included
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