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Use measurements you can verify. Unknown or unreadable details can be left unspecified where the tool allows it.
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How to use this tool
- Record the lamp wavelength and viewing conditions; do not look directly into the UV source.
- Select the observed glow and daylight appearance rather than a hoped-for result.
- Choose the object’s actual condition and read the limitations and handling note.
- Keep the item decorative, avoid destructive tests, and seek specialist testing if exact composition matters.
What the result means
Some uranium-containing historic glass fluoresces under ultraviolet illumination, often green or yellow-green. The exact appearance depends on glass formulation, uranium content, thickness, lamp spectrum, viewing distance and ambient light. A 365 nm lamp and a 395 nm lamp do not provide identical evidence.
The tool documents what the user sees and distinguishes an observation from a material identification. It also separates fluorescence interpretation from surface condition: damaged, chipped or powdering items deserve more conservative handling regardless of the apparent glow.
Limits and good practice
This is not a radiation survey, chemical analysis, or certification that an object contains uranium. Fluorescence alone does not establish age or composition. Avoid food and drink use as a conservative practice; do not grind, chip, drill, scrape or use chemical tests. For significant concerns, consult a qualified conservator or radiation-safety professional.
References and further research
Frequently asked questions
Does a bright green glow prove uranium glass?
No. It is a compatible clue, not a unique identification. Other formulations and viewing conditions can affect fluorescence.
Is 365 nm better than 395 nm?
They are different lamp wavelengths and can produce different visible responses. Neither alone confirms composition.
Does no glow mean there is no uranium?
No. Lamp output, glass chemistry, thickness and viewing conditions may reduce or hide a visible response.
Can I use uranium glass for drinking?
A conservative collection practice is to use it as decoration, not for food or drink, especially if damaged.
Does the UV test tell me whether the object is radioactive?
No. A visual UV observation is not a radiation measurement.
What if the glass is chipped or powdering?
Avoid using it with food, minimize handling and do not disturb residue. Seek professional advice if surface instability is present.