Hello Leon,
Tuesday, September 26, 2006, 9:52:31 AM, you wrote:
Some snippings :) and replies inbetween the lines
>>> >>DO NOT break the outer glass shell of a mercury vapour lamp! It
>>> >>will radiate a lot of short wave UV (UV-A) which is dangerous for
UV-C (UV-A) is long wave UV
>>> >>eyes and skin, and it generates lot of ozone (O3). Good results
>>> >>could be obtained without breaking the outer glass shell.
>> That was precisely the reason for my question (see the first post on this
>> thread). I understand from my web searching that UV-A is the radiation
Good one! Polymerisation is affected by UV-A
>> band that actively polymerises the UV resist. I further understand that
...
>> have done, it seems that the dangerous radiation bands are UV-B and UV-C;
>> so your quotation is quite incorrect on that point but the UV-B and UV-C
>> also is unblocked by breaking the glass filter. So the recommendation in
Absolutely true
>> that excerpt is appropriate for some purposes. However it is out of
>> context so I cannot tell. The so-called solariums (facial tanners) rely on
>> UV-A as their active radiation ingredient so it cannot be too harmful.
>> Ozone has got me a bit worried though.
> Several people remove the outer envelope, it has to be done with sodium
> vapour lamps anyway. I think that the Hg lamps will emit a lot of UV as it
> is. I used to get a lot of ozone from EPROM eraser tubes (germicidal tubes),
Germicidal tubes (real ones produced by Phillips os Osram do not emmit
ozone. Their glass and gas combination are specificially formulated so
that these lamps do not emmit ozone.
> so I'm used to it. It gets converted to O2 quite quickly, and the main
> effect is as an irritant. We will only have it on for a few minutes at a
> time, so I can't see it being a problem.
> They used to pump O3 throught the London Underground system at night, to
> kill germs. Perhaps they still do. I think a carbon filter will remove O3,
> they are used on photocopiers, which used to emit lots of ozone. At any
> rate, the old Xerox ones did - I used to work for Rank-Xerox (UK). It was
> produced by the corotron which charged the photoreceptor.
> Leon
> --
> Leon Heller, G1HSM
> Suzuki SV1000S motorcycle
> leon.heller@...
> http://www.geocities.com/leon_heller
For more mine replies on this subject please take a look at the
following messages in this group:
249
250
4116
13065
13086
--
Best regards,
Zoran A. Scepanovic
zastos@...∗∗∗∗∗∗∗∗∗
RAM = Rarely Adequate Memory
∗∗∗∗∗∗∗∗∗
Please be advised what was said may be absolutely wrong, and hereby this disclaimer follows. I reserve the right to be wrong and admit it in front of the entire world.
[Non-text portions of this message have been removed]