[Milsurplus] Type I-70-B Meters HOW HOT ARE THEY!!

[Mike Hanz]

Well, 'very' hot is a relative term, but I'm glad you checked.  The 
danger is not in the enclosed instrument, nor even in the uncovered one 
- in my demented opinion.  The real "whoa, Nelly!" is the stray dust 
particle that can be brushed off or blown away from the uncovered meter 
face by a breath of air.  That can be inhaled and potentially be a big 
problem for a person working on the movement.  AFAIK, if you keep it 
inside its glass and plastic prison, you shouldn't have any worries.  A 
laminar flow booth or its equivalent would be useful if you need to work 
on one.

73,
Mike

n2lxm@juno.com wrote:

>Greetings All,
>
>
>	A week or two ago I posted a message about the I-70-B Tuning Meter. I
>received many responses to it. One did indicate that these meters may be
>very hot( Radioactive ). Well after taking two apart and doing some much
>needed maintenance I was able to measure them with a survey meter. With
>the meter in it's housing the reading was appox 2.0 Mr/Hr, and with the
>meter out of the housing the reading was 40 Mr/Hr. That's a big increase.
>So I went around the shop/shack and checked all the old Military meters,
>most read in the 2 - 3 Mr/Hr range. So if your not sleeping with them up
>against your skin it will be O.K. .  I all so found that the front panel
>of a BC-1306 is Hot too, I have had a receiver section mounted in a small
>cabinet siting on the upper shelf of my work bench for a few years now. 
>I think I may invest in some thin lead sheeting to cover things up when I
>am not using them, but the lead can be just as bad, Oh well life goes on.
>
>
>
>
>
>                                         Jeff N2LXM
>                                          American
>                                            Patriot
>                                Amateur Radio Operator
>                         Proud Father of Two U.S. Marines
>
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>