Date: Thu, 30 Sep 2010 15:52:04 -0500
Reply-To: chemsafety**At_Symbol_Here**
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: "Jay A. Young" <chemsafety**At_Symbol_Here**VERIZON.NET>
Subject: Re: UV and gas discharge tubes
Questions  regarding eye exposures to harmful radiation, such as this question, require answers from an expert.  Ask your local opthalm ologist, NOT oculist, for his/her opinion--and be sure to also ask for the basis of their opinion.
Clearly, although incorporating a slit reduces the dose, the rules for toxins "The size of the dose determines the degree of harm"  (as my f riend and colleague, Theophrastus Bombastus vonHohenheim, used to say) radi ation follows a different "dose/harm caused" set of rules.
Jay Young

Sep 30, 2010 02:36:25 PM, DCHAS-L**At_Symbol_Here** w rote:
>When I've used these, we put cardboard over the majority of the lamp
>(not to uching the bulb of course), with a small rectangular slit about
>an inch long and 1/4" wide. I doubt splash goggles are doing much to
>< BR>>protect against any UV, but
>reducing the amount of light ente ring the eye should help.
>Karen Smith, CSMM
>Chemistry Stockroom Manager
>Whitman College
>345 Boyer Ave.
>Wall a Walla, WA 99362
>509 527-5272
>On Sep 30, 2010, at 10 :50 AM, Murphy, Dr. Ruth Ann wrote:
>> Good Af ternoon!
>> How much of a risk of UV damage to the eye is there from using
>> spectroscopes and looking at hydrogen spe ctra, mercury vapor
>> spectra, etc.? One lab text admonishes stu dents not to "look
>> directly=" at the illuminate d lamps. Do you think this =E2=80=93 along
>> wearin g the usually splash goggles - is sufficient precaution?
> ;> Thank you.
>> Ruth Ann
>>>> Ruth Ann Murphy, Ph.D.
>> Professor of Chemistry
> ;> Chairperson, Department of Chemistry, Environmental Science and
& gt;> Geology
>> Chairperson, Health Professions Advisory Commit tee
>> JAMP Faculty Director
>> Goldwater Scholarship Fac ulty Representative
>> The University of Mary Hardin-Baylor
> ;> 900 College Street
>> Belton, TX 76513-2599
>> Phon e 254.295.4542

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