Re: Looking for a very high count rate alpha meter

[Lew Helgeson <lewhelgeson@helge.com>]

Try Technical Associates. They are probably still in Burbank, California,
and normally exhibit at the annual HP meetings. They have made the "Juno"
portable instrument that was used way back in 1948 when I first started
woring at Hanford. This is an ionization typd of instrument and has two
retractable shields, one to shield out alpha but let betas through and a
second to shield out most betas and let gamma through. The Junos that we
used to use had a full scale reading of 5 R/hour gamma. I don't remember the
maximum alpha rnage in d/m, but I know that when I was in charge of HP
Instrument calibration way back in 1950-1952 (approximately) we used to
calibrate them for alpha on all three ranges (for gamma these were: 0-50
mr/hr, 0-500 mr/hr, 0-5000 mr/hr).

Lew Helgeson

At 03:36 PM 3/23/1999 -0600, you wrote:
>Radsafers,
>
>I am looking for a very high count rate alpha meter.  Specifically, I am
>looking for ranges of >10^4 to 10^6 cpm.  We currently have alpha dose
>rate instruments for this high range, but they have correction factors
>for conversion from dose rate to dpm. 
>
>Please send responses to this address.
>
>Thanks,
>
>Robert A. Jones			Robert_A_Jones@rl.gov
><mailto:Robert_A_Jones@rl.gov> 
>Health Physicist 			phone: (509)376-8528
>PFP Radiological Control 		fax: (509)373-4274
>Hanford, WA				Hanford Pager: 85-6559 
>
>
>
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