RDU Irish
Catholics vs. Cousins
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OK ... maybe there is some usefulness in this UVC business. It, however, is not an obvious solution to our big problems.
The basic science: ultraviolet light generally will destroy micro-organisms and viruses along with mutating our own cells. UV is "divided" artificially by scientists into three wavelength ranges. UVA (near UV) is poorly filtered by the ozone layer and can cause some disinfecting action, suntan, and some amounts of skin cancer through over-exposure. UVB sneaks some amount through the ozone layer and is a real bad guy as to cancers. UVC is the shortest length UV class radiation (abutting up against the X-rays) but is entirely filtered out by the Ozone layer. "A" "B" and "C" decrease in wavelength, and thereby increase in potential chemical bond destruction, and (one would think) cellular danger and molecular damaging. To some degree that is correct.
BUT. Although UVC is theoretically a dangerous chemical bond-breaker, it (of course) has to "hit" that vulnerable cell or whatever to break that bond and ultimately flummox the cell's or the virus' ability to function. "Shine" that light directly on something and whatever organic molecules get "hit" may likely "break." For a micro-organism, "break" equals "die", so this has been used against Tuberculosis for a while.
UVC is used in human situations because if it is prevented from being too intense and just limited to human skin surfaces, the outer layers of our skin (dead cells called Keratinocytes I think I remember) will absorb the UVC stopping it from going deeper to the living level. If "germs" are on the surface, UVC may well kill them without damaging the person. This doesn't hold for the UVB range, so whatever your radiative device is must be very well engineered.
Also, in the COVID situation, the idea floated is to have all sensitive areas of personal interaction (especially medical, but also common areas such as grocery stores et al) outfitted with UVC devices. The idea of these would be to sterilize the air and, using air drafts/circulation, some percentage of contaminated surfaces. Not a dead simple thing.
1. This is EXPENSIVE.
2. It requires very good engineering --- air drafting to push air constantly over surfaces and upwards through the devices to bring contaminants close to the UV kill zones in the devices is one example of the engineering involved.
3. UVC is a form of Light, so it diminishes in intensity by the standard 1 over r-squared law. That means distances are just as important as radiation power in the initial generator. That's geometry and therefore more clever engineering.
4. It would be nice to know exactly what the vulnerability (fragility) of COVID was before we did all that engineering --- i.e. how much ZAP does it take to make it inert?
5. BIG money organizations MIGHT be able to afford all this --- Small ones surely couldn't.
6. The public is not only uneducated but almost hysterical when it comes to ANY mention of "radiation." How much trouble will their (ignorant --- yes that's all you can call it) emotions cause?
Well, the list can easily go on. You get the idea. NOT a quick fix to the COVID problem.
Is this similar to the UV lights people promote in HVAC air handlers to help with allergies?
Another interesting concept presented to me recently on antibodies. Is exposure required to create the antibodies that get found in testing and those reduce over an unknown time as you are further removed from exposure such that a few weeks after you resist or recover you may no longer show antibodies? If I had it or resisted it in February - entirely possible I no longer test as such?