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186/257nm UV-C Mercury Resonance Line Sterilizer from Junk Box Bits

186/257nm UV-C Mercury Resonance Line Sterilizer from Junk Box Bits

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As everybody knows that damn COVID-19 Pandemic has forced us all into our houses to delay its spread. I watched a video of a doctor in Michigan using Sodium Hypochlorite to sterilize groceries he'd bought for his aged parents.

I thought that I could "cook up" a quicker...if not more potentially dangerous, method of doing it quicker. Protiens don't like mercury resonance lines so the virus is just a bit of RNA in a protien "box" with protien receptors poking out of it...so a bit of 184 and 256 mercury resonance radiation to break a few random chemical bonds here and there too"mess things up" a bit should go towards delaying getting infected by it for a bit. Just remember to wear your wrap around safety glasses when using it.

So a five minute blast of grocries with this, turning them now and then to expose all sides may help in delaying it a bit.

Here in Tasmania there are 50 confirmed cases (and 500-1000 unconfirmed) roaming about in a population of 600,000...it is currently period doubling each week, 50, 100, 200, 400...so the whole population will have it in ten weeks if we can't knock the R0 down a bit by staying in.

Our State Government couldn't drag up a critical thinker between the lot of them, so we can't rely on them making any ultimately beneficial decisions so my missus and I are confined to the house for the next three months and this object is a Globe Collector's answer to at least some of the issues that may arise.

and20identified20lines20Shut20with20Dysprosium2002.JPG PFC2.gif 256nm20Sterilizer20from20Junk.jpg HgDG-IMG-09r.jpg

Light Information

Light Information

Model Reference:25w 240v Incandescent and 400w Na-Sc Metal Halide Arc Tube In Series.
Electrical
Wattage:c5
Voltage:c20

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Album name:Globe Collector / Miscelaneous Lamp related stuff
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Date added:Mar 29, 2020
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tuopeek
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Mar 29, 2020 at 04:26 AM Author: tuopeek
Like the contraption. I have also been using a UV-C lamp but I think the virus takes a bit more UV to damage it (~20 minutes) where as bacteria are damaged quite quickly. Your lamp may have the advantage of generating a lot of ozone which is also quite sanitising on it's own. I think my UV-C light is designed not to generate high quantities of ozone. You may need a few arc tubes before the virus is defeated given that the lamp feed in seals may corrode in during run times.
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Mar 29, 2020 at 05:00 AM Author: Globe Collector
The power level is very low and the arc tube does not really get hot, so the seals should outlast me, I do agree that because the virus is so tiny, its cross-section to the radiation is equally tiny, so the longer exposures are probably the go!

Manufactured articles should be made to be used, not made to be sold!

Fee, Fye, Fow, Fum, A dead man's eye and a parrot's BUM!

rjluna2
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Mar 29, 2020 at 03:22 PM Author: rjluna2
Nice rigging, Andrew

We must not forget our old school can do effective job on this mess.

Pretty, please no more Chinese failure.

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Mar 29, 2020 at 04:56 PM Author: sox35
A genuine germicidal lamp would be better, plenty of small 6W or 8W T5's out there. Although I am still to be convinced as to the usefulness of doing this.

Ria in Aberdeen
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Globe Collector
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Mar 29, 2020 at 05:43 PM Author: Globe Collector
Turn this on, smell your hand (get normal smell) put your hand next to this for ten seconds then smell your hand again (burnt hair small) meaning there are badly damaged protiens in the dead layer of dermal cells.

"Better" is a loaded word advertisers who want to sell you something use, I avoid this word and others, (like "new") as their meaning and definition are vague, leading and imprecise and our language has far more appropriate words which convey much more precise meaning. The word "Genuine" is also a loaded word....who says ?, what Physics do they have to justify its "genuineness"? I have talked to company representatives who supply germicidal lamps for the toilets at the Wrest Point Casino....their words were basically full of unsubstantiated BS and advertising buzzwords. They tried to tell me that could not give me an E.O.L. lamp because it contained Rhodium and that had to be recycled...what a load of BS. If there was Rhodium, it was a tiny sputtered coating on the outside of the tube to block the 186nm line....they tried to tell me it is in the electrodes in gram quantities! Basically they were sales morons with no comprehension of the functioning of the devices they peddled.

Purpose-made germicidal lamps have a layer of filter material (possibly Rhodium Oxide) that filters out the 186nm shorter wavelength mercury resonance line which has enough energy, (by Plank's Equation) to break the oxygen oxygen double bond and form free atomic oxygen, (which then reacts immediately with diatomic oxygen to make ozone). In these lamps it is the 256nm line that does all the protien damage as this line has insufficient energy to break the oxygen oxygen double bond but it IS sufficient to break carbon to hydrogen/nitrogen/hydrogen.carbon single bonds....the sort found in organic compounds like peptides and protiens.

That said, this produces 256nm resonance radiation in exactly the same manner as a germicidal lamp, a low current discharge through c20 militorr mercury vapor. Yes, its electrodes are more inefficient, yes it is shorter and smaller, yes, it has exposed live metalwork......but under the current circumstances those a just a moot point.

The ozone produced acts as a secondary serilant due to its powerful oxidizing properties. The only real issue here is exposure time and the very small radiation capture cross-section of the Corona Virus.

Manufactured articles should be made to be used, not made to be sold!

Fee, Fye, Fow, Fum, A dead man's eye and a parrot's BUM!

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Mar 29, 2020 at 07:21 PM Author: don93s
Interesting stuff. The other day I was looking up virus' and started looking at other exotic pathogens...such as 'prions', which are 'misfolded' proteins, causing livestock death and the famous, 'mad-cow' disease. They are not a living organism (a virus borders on 'living' vs bacteria) and can survive tempratures of up to 600 deg.C if I recall. So, question is, would UV have an effect on these 'misfolded' proteins?
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Mar 29, 2020 at 08:59 PM Author: lights*plus
Great idea! Can you give us the particulars in your setup? 230 volts mains? Incandescent lamp in series? What is that lamp rated at and would it be different if I need to ballast a 400w MV arc-tube vs a 175w one.

Actually I have a number of broken MH lamps still on their frames. How do I under-drive a 400w MH arc-tube to get the UV output mainly from the Hg fill?
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Mar 29, 2020 at 09:05 PM Author: Globe Collector
Probably the most well known "misfolded protien" is Gelatin....the stuff they make Jelly/Jello from. It strated out as collagen, the stuff tendons are made from, but heat and water transforms it to gelatin....and as far as I can tell it is thermodynamically an irreversable process.

I know that viruses are not technically "alive"....some, like the Poliomyelits virus and Tobacco Mosaic virus, (a plant virus)can be crystalized from aqueous solutions like some pure chemical compounds such as urea or sugar or metal salts like salt or copper sulphate. In these crystals, if stored away from UV, light, moisture and oxygen can remain infections for tens of thousands of years.

The "survival" at 600*C is questionable...yes, maybe for a few tens of seconds, but most bio-organic molecules, things like glycene, ATP and sugars start to rapidly decompose at these temperatures. Fats, least some fats can withstand this sort of temperature for longer, but most tyriglyceride fats with ester linkages will degrade.

In the Chemical and Rubber Co. Handbook of Chemistry and Physics there is a long list of organic compounds...in another part of the book there is an equally long list of melting points on order of increasing temperature...with a reference number on each one linking it back to a compound in the other list.....well I decided to look up the HIGHEST melting point to see what it was...it was Carnatyl Alcohol, CH3(CH2)33OH with a melting point of 913*C...that's getting well on to red hot and not so far from the melting point of silver at 962*C.

Sure, if you heated the carnatyl alcohol in the air, it would just burn...but still, a red hot hydrocarbon liquid in an airtight container....and a bloody alcohol to boot....that's as unintuitive as gyroscopic motion!

The prions are really scary stuff, just "buckle" a protien a bit and muck up the functioning of your brain!

As for damaging the Corona Virus with 256nm light....the only real thing the virus has in its favor is its incredibly tiny size...its diameter is 125nm, which is smaller than the wavelength of the radiation, so it isn't a very effective antenna...sort of like trying to pick up FM broadcast band (c100MHz) with a band-II TV yagi (c200MHz)...yep, you will get something, but it just won't really be as optimal as it could be.

But the 256nm radiation, from an energy point if view, (when using Plank's Equation) is more than enough to damage protiens as the energy of 256nm radiation is 4.85eV.

Actually I went away and did the maths...ain't done this much maths for years...


Bond Energies:-

Carbon to Hydrogen single sigma bond.....4.28eV (Less than 4.85 so it will get busted)

Carbon to Carbon single sigma bond......3.6eV (likwise)

Carbon to Nitrogen single sigma bond....3.2eV (Likwise)

Carbon to Oxygen Single Sigma bond.......3.7eV (Likewise)

Hydrogen to Oxygen single sigma bond .....4.8eV (As in water and alcohol OH groups)...Hmmm, just broken! 4.848eV (O-H Bond) vs 4.8559eV (256nm Mercury Resonance Line) I had to go and re-calculate out to more decimal places as they are so bloody close to each other!

Oxygen to Oxygen double sigma-pi bond....5.1eV Nope, not broken by 4.85eV 256nm Mercury Resonance Line BUT it IS BROKEN by the 6.75eV 184nm Mercury Resonance Line....hence the ozone. So "ozone free" germicidal lamps have some thin sputtered coating in their fused silica tubes or a doped with some oxide that blocks 184 but passes 256. There's a rumor it is Rhodium Oxide. Cerium Dioxide doping blocks 256nm as well.


Mercury Resonance Line Energies

184nm.........6.75eV

256nm.........4.85eV


And some more common spectral lines for comparison:-

351nm Mercury UV-A Line (Blacklight) ....3.54eV

437nm Mercury violet-blue line..........2.84eV

540nm Mercury Lime Green Line...........2.3eV

589nm Mercury Yellow Doublet...........2.11eV

Notice these are all too piss-weak to break any of the bonds listed above...except the 351nm UV-A line which looks like it can break the C-N single sigma bond (3.54eV for 351nm line vs 3.2eV for C-N single Sigma Bond, I didn't know that...so you learn something every day. So it is justified to take caution with "blacklight" and sunlight.

So it is definitely worth "Going Quantative" at times...!!

Manufactured articles should be made to be used, not made to be sold!

Fee, Fye, Fow, Fum, A dead man's eye and a parrot's BUM!

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Mar 29, 2020 at 09:25 PM Author: Globe Collector
Geroge, Just saw your question.

This is a very simple setup, just a 25w 240v lamp in series with an old 400w Metal Halide Arc Tube I had lying around. The Arc tube is fitted with a starting electrode and 25K resistor counter connected back to the other main electrode, this is essential or it won't start. (I had another arc tube without the auxillary electrode so I could not use that in this setup.)

It simply runs from the 240v 50Hz mains. The lamp measures 150 Ohms cold resistance.

In Canada you will need more bits and could do it two ways.

Way #1

Procure a 30-100VA transformer with a 120v primary and about 250-300v secondary, you may well be able to re-purpose the leak autotransformer gear for a 175w or less mercury lamp. Place a 25w 120v lamp in series with the primary winding, connect the arc tube, (and it can be any mercury containing arc tube with an auxillary electrode) across the secondary of the transformer. And that's it.

Note, this circuit may work with arc tubes that have no auxillary electrodes but it will probably flicker.

Way #2

Use the same transformer, but (you will be) applying the 120v mains directly to the primary when you are finished of course. Place two or even three 7w C7 type Christmas Lamps or similar in series on the secondary and the arc tube in series with those. All the series lamps are best to be the same and their combined voltage must be equal to or greater than the open circuit secondary voltage of the transformer.

Final caution note: Make sure you wear WRAPAROUND safety glasses before you use this damn thing, check the glasses with some Yttrium Orthovanadate phosphor behind them (and see if it glows pink) to ensure the 256 and 184 do NOT go through the glasses. DON'T LET this radiation impinge on the corneas of your eyes FROM ANY ANGLE AND EVEN REFLECTED FROM SHINY METAL SURFACES!!!

Not unless you are some sort of sadist who likes the feel of sand in their eyes for a day or two!!!


The key to making this work is to run the arc tube at the lowest power you can without it extinguishing....the arc tube must not get hot, it has to run under 20w and stay cool, this will ensure as much of the radiant flux as possible is crammed into those two lethal resonance lines! The fine details of how it is achieved are not really important...like you could use power resistors instead of lamps in series, but since we are lamp collectors we are more likely to have lamps lying around. The trock is keeping the open circuit voltage up in the 300-350v area and the arc current down, in the 50-150mA area. The details of how you achieve that goal are unimportant.

Oh, forgot...you can basically use ANY OLD arc tube with an auxiliary electrode fitted you might have lying around. The problem with 175w arc tubes is they are just too pissy-small, (all electrode drop and practically no positive column), you want a nice big, long arc tube you can put your boxes of Corn Flakes and Jars of Vegemite next to!

Manufactured articles should be made to be used, not made to be sold!

Fee, Fye, Fow, Fum, A dead man's eye and a parrot's BUM!

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Mar 30, 2020 at 02:13 PM Author: Ash
PL ballast + stupid superimposed ignitor would work quite well i guess
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