[ RadSafe ] Optical Couplant

[AnaLog Services, Inc.]

As far as I know, it is rare to have naked crystal material coupled directly 
to the PMT face.  At least it is rare in my industry.  I have seen it, but 
only a couple of times.  NaI is quite hygroscopic so dealing with bare 
crystal material except in a special facility is problematic.  I believe NaI 
is regarded as toxic also.

Heck, we have problems with crystals turning yellow even in the hermetic 
containers.

Syd H. Levine
AnaLog Services, Inc.
Phone:  (270) 276-5671
Telefax:  (270) 276-5588
E-mail:  analog at logwell.com
Web URL:  www.logwell.com

----- Original Message ----- 
From: "Edmond Baratta" <edmond0033 at comcast.net>
To: <syd.levine at mindspring.com>; <alstonchris at netscape.net>
Cc: <radsafe at radlab.nl>
Sent: Tuesday, October 27, 2009 8:11 PM
Subject: Re: [ RadSafe ] Optical Couplant


>I believe only the older ones were coupled.  Most of the newer ones are 
>coupled directly and sealed.  The manufacturers used to supply (sell) the 
>material to couple the older ones.
>
> Ed Baratta
>
> edmond0033 at comcast.net
>
> --------------------------------------------------
> From: <alstonchris at netscape.net>
> Sent: Tuesday, October 27, 2009 6:10 PM
> To: <syd.levine at mindspring.com>
> Cc: <radsafe at radlab.nl>
> Subject: Re: [ RadSafe ] Optical Couplant
>
>>
>> Syd
>>
>> Is there nothing in Knoll (Radiation Detect and Measure) that's useful on 
>> this subject?  Also, e.g., research-grade NaI crystals are mated directly 
>> to the PMT, no?
>>
>> Cheers
>> cja
>>
>>
>> -----Original Message-----
>> From: Syd H. Levine <syd.levine at mindspring.com>
>> To: J. Marshall Reber <jmarshall.reber at comcast.net>
>> Cc: radsafe at radlab.nl
>> Sent: Sat, Oct 17, 2009 10:16 pm
>> Subject: Re: [ RadSafe ] Optical Couplant
>>
>>
>> I looked for something, even qualitative, and could not find anything 
>> interesting. I found some stuff related to fiber optics that surprised me 
>> (not as big an improvement as I expected), but I do not know how that 
>> applies to scintillation detectors. I do not *think* a scintillation 
>> detector will work at all without coupling compound.
>>
>> Syd
>>
>> ----- Original Message ----- From: "J. Marshall Reber" 
>> <jmarshall.reber at comcast.net>
>> To: "Syd H. Levine" <syd.levine at mindspring.com>
>> Cc: <radsafe at radlab.nl>
>> Sent: Saturday, October 17, 2009 3:48 PM
>> Subject: Re: [ RadSafe ] Optical Couplant
>>
>>>
>>> On Oct 17, 2009, at 4:21 PM, Syd H. Levine wrote:
>>>
>>>> I finally got around to writing a page about optical coupling 
>>>> compounds:
>>>> http://www.logwell.com/tech/servtips/optical_coupling_grease.html
>>>>
>>>> Comments or criticisms needed and much appreciated.
>>>
>>> It would be useful to quote in quantitative terms the actual light > 
>>> transmission improvement of using the coupling compounds.
>>>
>>> Unfortunately I am unaware of such data.
>>>
>>> J. Marshall Reber, ScD
>>> 165 Berkeley St.
>>> Methuen MA 01844
>>>
>>> Tel/Fax: 978-683-6540
>>> Alternate Email: reber at alum.mit.edu
>>>
>>>
>>>
>>>
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>
>