This specimen is a vintage camera lens extracted from a pre-1970s Canon assembly. These lenses were manufactured using thorium dioxide (ThO2) can containing up to 30% thorium by weight—to achieve the high refractive index and low dispersion required for professional optics.
Over time, this lens may have developed a characteristic yellow, amber, or brown tint caused by decades of self-irradiation. This discoloration can be mitigated, if desired, by exposing the glass to ultraviolet (UV) light.
Technical & Calibration Data
This item is sold specifically as a radiation check source for testing and calibrating Geiger counters, scintillators, and gamma spectroscopy equipment. It provides a consistent and stable source of alpha, beta, and gamma emissions.
Spectroscopy Utility: Thorium is an ideal calibration source for devices like the Radiacode series, as it provides the three critical data points required for accurate calibration at 88 keV, 583 keV, and 2614 keV.
Specifications
Dimensions: 21mm x 7mm
Material: Thorium-doped optical glass (Vitrified source)
Source: Salvaged from pre-1970s Canon optics
Emission Types: Alpha, Beta, and Gamma
Safety & Handling
The radioactive material is fixed within the glass matrix, making it a clean and durable source for benchtop testing. However, it should still be handled with appropriate care. We recommend storing the lens in a labeled container when not being used for equipment verification.
Radiation detector not included.
NOTE: By purchasing this item you agree that you have read our Terms of Service (also serves as WARNINGS and NOTICES).
