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For anyone who's interested, CIE recently made their UVGI standards available for free ($150 normally): http://files.cie.co.at/cie187-2010%20(free%20copy%20Mar

by herf 7y ago

For anyone who's interested, CIE recently made their UVGI standards available for free ($150 normally): http://files.cie.co.at/cie187-2010%20(free%20copy%20March%202020).pdf http://files.cie.co.at/cie187-2010%20(free%20copy%20March%20... http://files.cie.co.at/cie155-2003%20(free%20copy%20March%202020).pdf http://files.cie.co.at/cie155-2003%20(free%20copy%20March%20... Generally you don't want to be around most UVC (253nm) because these wavelengths are very good at giving you cataracts, etc. So if you buy these things online, don't stay in the room when you turn them on. There are some newer lamps (210-220nm) that don't seem to penetrate the outer layer of the epidermis (cornea or skin) and so might be OK for occupied spaces. But companies are still being very cautious about occupied uses, because this all still has yet to be proven in real life. Also, 220nm requires excimer lamps, so 253nm is way easier to get for now.

wideasleep1 7y ago
Just to add, when I did some research on excimer lamps last week, producers are few, and the research I discovered were sometimes using the 253nm lamps, but adding filters to get to the 210-220nm range. It quite confusing, to say the least. Edit: Indeed the article linked above is one such study:"We used a bank of three excimer lamps containing a Kr-Cl gas mixture that predominantly emits at 222 nm25,26. The exit window of each lamp was covered with a custom bandpass filter designed to remove all but the dominant emission wavelength as previously described15. Each bandpass filter (Omega Optical, Brattleboro, VT) had a center wavelength of 222 nm and a full width at half maximum (FWHM) of 25 nm and enables >20% transmission at 222 nm."
prox 7y ago
How about just heating your mail in a dry oven? Thats what Stanford tested for PPE masks. Or just waiting 24 hours or more works as well,

by herf 7y ago

wideasleep1 7y ago

Just to add, when I did some research on excimer lamps last week, producers are few, and the research I discovered were sometimes using the 253nm lamps, but adding filters to get to the 210-220nm range. It quite confusing, to say the least. Edit: Indeed the article linked above is one such study:"We used a bank of three excimer lamps containing a Kr-Cl gas mixture that predominantly emits at 222 nm25,26. The exit window of each lamp was covered with a custom bandpass filter designed to remove all but the dominant emission wavelength as previously described15. Each bandpass filter (Omega Optical, Brattleboro, VT) had a center wavelength of 222 nm and a full width at half maximum (FWHM) of 25 nm and enables >20% transmission at 222 nm."

prox 7y ago

How about just heating your mail in a dry oven? Thats what Stanford tested for PPE masks. Or just waiting 24 hours or more works as well,