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Eberline PNR 4 ?

Posted: Thu Oct 02, 2003 1:11 pm
by ChrisSmolinski
I may have an opportunity to buy one of these neutron detectors. Does anyone have any experience with them or comments? Suggested value based on condition?

Re: Eberline PNR 4 ?

Posted: Fri Oct 03, 2003 9:42 am
by joemanity
Chris,

I've been working in the Nuclear Industry for over 20 years, and the PNR-4 is the old standby for neutron detection. Used to use one everytime I went into the Containment Building - until we got some new compact, liteweight instrument called the REM500. I, myself, have my eyes on a SNOOPY (Navy Neutron Detector) that has been lieing around here for the past 10 years.......replaced the batteries, and it works fine. I might grab one of the PNR-4s also, if I can get one out - they all have a small amount of fixed contamination on them - but that won't be much of a problem. If you do buy one, and need some parts, letme know, we have a few broken ones around here.

Gregg

Re: Eberline PNR 4 ?

Posted: Thu Oct 09, 2003 3:51 am
by Frank Sanns
Gregg,

From what I have heard, the REM500 is a great instrument. I also heard that us common folk could never get one because it contains around a half a micro Curie of Cm 242 which requires a source license. Do you know if that is true and if the REM500 does have a built in neutron source and how is it shielded to make a measurement without counting the source.

Re: Eberline PNR 4 ?

Posted: Sun Oct 12, 2003 12:32 pm
by joemanity
Yes, the REM500 is lightyears ahead of the PNR-4. Its small, compact, and lightweight. It is, however, slower in responding to neutron radiation. It updates its digital display every 10 seconds, which gives you a slight delay, but it doesn't cause much of a problem - just takes a little getting used to. Its alot easier to carry when climbing up ladders, than the PNR-4! The only thing I don't like about it, is that the display light only stays on about 10 seconds, then goes out - you have to keep pressing the button. Most of the time when I make an entry into the Containment Building, half of the lightbulbs are out.

As far as the source, the ones we have, have a 1 uCi CM-244 source in them. The licencable quantity of CM-244 is .001 uCi, therefore, even I can't take it home (that's why I've snagged one of the older neutron meters - and I don't have any ladders to climb at home!

I couldn't find a tech manual on it, (I think its in training - we have 4 of these, and only 1 tech manual?), but I think the source is located just outside the detector in a small 1"x2" box. It is used, not to source check the instrument, but to see if the electronics are functioning properly. During the check, a small door opens up to let the detector see the source. We also source check ours with an AM-241 source. I'll try and get my hands on the tech manual if you're still interested.

Gregg

Re: Eberline PNR 4 ?

Posted: Mon Oct 13, 2003 2:40 pm
by Richard Hull
I have 3 PNR-4s and no tech manual. If it could be xerox'd I would be more than willing to pay to have a copy.

Richard Hull

Re: Eberline PNR 4 ?

Posted: Thu Oct 16, 2003 11:06 am
by joemanity
We have a few Tech Manuals at work. I'm working this weekend, and if its slow, I'll see if I can't put one into pdf format and post it here. Also, I'm trying to get a copy (also pdf format) for the Snoopy (NP-2 or AN/PDR-70) from the company. If I get that, I'll post it, also. Mine has a problem with the High Voltage board. We did have 3 others, but they got thrown away about a year or two ago (I must have been on vacation at the time...)

Re: Eberline PNR 4 ?

Posted: Fri Oct 17, 2003 2:54 am
by Richard Hester
Very interesting. I have a Tracerlabs "Snoopy" that I have been meaning to restore for some time. Right now, it is lacking the battery holder, so I need to add that and go from there. I got a manual that includes schematics from NRC, but I don't know if the circuitry is the same. I'd welcome an older manual.

Re: Eberline PNR 4 ?

Posted: Sat Oct 18, 2003 10:44 am
by joemanity
OK, I uploaded a copy of the PNR-4 tech manual. Its in the files section. I had to scan each page, then convert over to .pdf format, but I did not have the ability to combine all the pages. You would think that if you worked at a multi-million dollar Nuclear Plant, that they could afford the whole Adobe Acrobat program (and not just the reader). Anyway, I zipped all the pages together, so hope that helps.

Richard, I'd appreciate a copy of your "Snoopy" manual (if possible). Mine is a NRC.