[ RadSafe ] GM saturation leading to failure

[Geo>K0FF]

http://www.qsl.net/k0ff/Time%20to%20Count/

In the link is the patent covering Time to Count technology that extends GM 
range as far as 50R/H. For your amusement, the picture in the same link is a 
handheld device that might be helpful in fluxes above 50R/H.A little mirror 
on a chain is the active element.

George Dowell
----- Original Message ----- 
From: "Geo>K0FF" <GEOelectronics at netscape.com>
To: "Ross Beveridge" <rgb at rrbev.co.uk>; "Radsafe" <radsafe at radlab.nl>
Sent: Wednesday, June 04, 2008 9:08 AM
Subject: Re: [ RadSafe ] GM saturation leading to failure


> Can you cite a reference that I might look this up? In my experience, a 
> current limited saturation event does not harm a GM tube any more than a 
> neon lamp is damaged when discharged under current limited operating 
> conditions.
> Naturally a meter unit that does not recognize saturation and alert or 
> alarm the operator is not desirable in a high flux field.
>
> Some advanced designs "pulse" the high voltage in such a way that the 
> upper range of saturation onset  is greatly extended.
>
> Most also include a dual GM probe, with one for low ranges and one 
> specifically designed for very high ranges.
>
> No need to abandon GM tubes in most any significant flux, if the system is 
> designed for it.
>
> George Dowell
> NLNL
> New London Nucleonics Lab
> GEOelectronics at netscape.com
>
> ----- Original Message ----- 
> From: "Ross Beveridge" <rgb at rrbev.co.uk>
> To: "Radsafe" <radsafe at radlab.nl>
> Sent: Wednesday, June 04, 2008 5:52 AM
> Subject: [ RadSafe ] GM saturation leading to failure
>
>
>> Radsafers
>>
>> I've encountered some training material that discourages/prohibits the 
>> use
>> of a GM contam instrument for radiation field detection.  The reason 
>> cited
>> for this is GM tube failure.  Having used this method in the field (in 
>> some
>> significant radiation fields) I'm not convinced this is a significant
>> problem, when used in an operational monitoring context.
>>
>> Any further information/actual experience would be great.
>>
>> Thanks in advance
>>
>> Ross
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