[ARC5] R-23/ARC-5

[Michael Hanz]

On 2/28/2019 11:00 PM, Richard Knoppow wrote:
> How are you measuring radiation, or lack of it?

AN/PDR-27 GM Survey Meter:

"The AN/PDR-27 is described by the Directory of Radiac Equipment 
(1961/62) as a “portable, watertight, battery-operated instrument that 
furnishes visual and audible indication, detection and computation of 
radioactivity data.”"

"All the models employ two halogen quenched GM tubes: an end window GM, 
and a small side window GM.  The latter is only used when measurements 
are performed using the two higher scales (0-50 and 0-500 mR/hr). Some 
models (e.g., Model J) employ a two-compartment probe where both GM 
tubes are piggy-backed together.  Other models have the small higher 
range GM tube housed inside the case."

Image result for AN/PDR-27F
>
> On 2/28/2019 7:54 PM, Michael Hanz wrote:
>> I have found no radium-based paint on any of the AN/ARC-5 equipment 
>> with my AN/PDR-27F instrument.  Some of the engravings, however, are 
>> /photoluminescent/, and will glow under a UV light.  There are other 
>> spots on AN/ARC-5 equipment that have that same paint applied, such 
>> as the center dot on the remote control cranks, a "bar" line on the 
>> little switches, the radiused arrows on the volume controls, etc.  
>> For some reason, none of the SCR-274 equipment has similar capabilities.
>>
>> The only _aircraft_ instruments I have found with radiolumenescent 
>> markings have been meters, like the "Tune to Max" meter for the 
>> navigation receivers, and panel meters for temperature and the like.
>>
>> Marine Corps sets seem to have taken the radiolumenescent approach 
>> far more than aircraft...perhaps because they did not have UV lights 
>> in their environment that was pervasive in aircraft.
>>
>>   - - Mike  KC4TOS


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