Suzie: I would be interested in helping at fair. Neil...
46899
Octave
unixconsole
Jul 1, 2012 7:35 am
I have the original Lionel circuit diagram. The issue is that I can't read the labeling on some of the replacement capacitors. So what I'm hoping is that...
46900
Octave
unixconsole
Jul 1, 2012 7:35 am
I have the original Lionel circuit diagram. The issue is that I can't read the labeling on some of the replacement capacitors. So what I'm hoping is that...
46901
buzz1320
Jul 1, 2012 11:25 am
I think this link will help you. http://www.orau.org/ptp/museumlibrary.htm#civildefensemanuals <http://www.orau.org/ptp/museumlibrary.htm#civildefensemanuals> ...
46902
epkoncept
Jul 1, 2012 2:31 pm
Don't know the frequency you are going to use for the drive current, but any conductive material will have some eddy currents, and hence some losses, which...
46903
GEOelectronics@...
K0FF
Jul 1, 2012 6:31 pm
XRD/XRF (Crystal Bragg Diffractometer, XRF exciter) and PMT counting desk. Various PMT counters including Lucas Cell. This is where the PMT testing will be...
46904
Robert Druecker
r.druecker
Jul 1, 2012 7:11 pm
Speaki g of Eddy current. you can see and experiment with eddies using a 3 ft length of 1/2" copper tubing. s steel ball bearing tha fits inside loosely, and...
46905
Al Shinn
alshinn
Jul 1, 2012 7:16 pm
Black hole alert! Dangerous site! Especially stay away from Townsend's book "electricity in gases" I only escaped when I forgot to breath and blacked out and...
46906
Octave Orgeron
unixconsole
Jul 1, 2012 7:26 pm
Hi, I already had the schematics and the manual. I was having problems reading the numbers on a few of the replacement ceramic capacitors. But I ended up...
46907
brianweber4@...
brianweber4
Jul 2, 2012 2:50 am
WOW a huge picture. Thanks! ... From: "Happynewgeiger" <torre.wtc@...> To: GeigerCounterEnthusiasts@yahoogroups.com Sent: Saturday, June 30, 2012...
46908
steve_schoner
Jul 2, 2012 7:38 am
Brian, The tube I extracted with the socket and gain from one of Geo's dud scintillators is: 13.5 mm in diameter 71 mm in length. I think that the R647-5 might...
46909
Walter Trovò
walter_to1976
Jul 2, 2012 9:15 am
Hi Geo, hi all. A friend who knows my interest in electronic/x-ray stuff has been asked to dismantle a Maxxi5 XRF machine: ...
46910
Steve
quatroforte100
Jul 2, 2012 3:00 pm
Hi Brian, Please can you let us know how that tube performs when measuring alpha particles. I understand that the Russians had difficulty in manufacturing...
46911
brianweber4@...
brianweber4
Jul 2, 2012 3:52 pm
Hi Steve, using a brohogan board, not really optimized with the correct voltage/anode resister  and a AM241 pellet I was able to get 200,000+ CPM ... From:...
46912
Happynewgeiger
happynewlaser
Jul 2, 2012 4:22 pm
Source Am241 pellet from smoke detector is producing gamma and alpha and some beta Tested now with a Geo310 and Eberline rascal background cpm102 cpm 1797...
46913
GEOelectronics@...
K0FF
Jul 2, 2012 4:38 pm
Main microscope table and desk. All Reichert, Austria. Zetopan,MEF1, MEF2. Behind the desk is the main shiled. It is 8 feet wide, 4 feet deep, 10 feet tall and...
46914
Brian
briangage47
Jul 2, 2012 4:50 pm
Hi Steve. Thanks for those measurements. Gives me some idea of the size and shape. My small PMT is a square 1" dual. A bit too large for the cigar tube idea....
46915
Atomic Dave
atomic.dave
Jul 2, 2012 4:53 pm
Can I ask you what value anode resistor is in the 310 and what voltage it's running at? ... Can I ask you what value anode resistor is in the 310 and what...
46916
GEOelectronics@...
K0FF
Jul 2, 2012 4:57 pm
GEO-310's have a 1.8 Meg resistor in series, then 475V worth of Zeners to ground, then a 3.3 meg resistor to the tube. All bypassed with a .01 capacitor. In...
46917
Brian
briangage47
Jul 2, 2012 5:05 pm
Okay Guys, Your numbers are puzzling me. Brian Weber reports200k CPM and you report 1797 total. I've tested 241Am buttons tight against the mesh protector of...
46918
Geikohento
atomic.dave
Jul 2, 2012 5:12 pm
but what about if i am running just the tube at 475v and with the brohogan kit. what value anode resistor is required? ... but what about if i am running just...
46919
Happynewgeiger
happynewlaser
Jul 2, 2012 5:24 pm
I'll give better explanation later My report is in CPM and the probe is a russian SI-8B CI8b that is in the Geo310. Based on double count on 1 minute base...
46920
Nick Andrews
nicothefabulous
Jul 2, 2012 5:47 pm
Or roll it up in that black foam available form Hobby Lobby. Less physical strength than the hollow wood stick, but quick and dirty. I have one of those thin...
46921
Nick Andrews
nicothefabulous
Jul 2, 2012 5:49 pm
I have some square aluminum tubing I salvaged from junked construction sign supports. The kind with springs so the wind just flexes them. Would have to...
46922
robert8rpi
Jul 2, 2012 6:02 pm
Hi Walter, These thin film XRF machines generally use tubes designed for dental X-Ray heads. I guess because they are common and fairly low cost. The detector...
46923
Nick Andrews
nicothefabulous
Jul 2, 2012 6:09 pm
In case anyone is interested, here is what I get to drink, bathe in and wash clothes and dogs with. So my question is, what are the manmade emitters causing...
46924
Happynewgeiger
happynewlaser
Jul 2, 2012 6:10 pm
LND712 probe and Eberline rascal CPM 99773 alpha+beta+gamma CPM 627 beta+gamma CPM 318 gamma We can say : The russian pancake SI-8B is sensible to alpha but...
46925
Robert Druecker
r.druecker
Jul 2, 2012 6:14 pm
just an example. I placed Am241 on my Ludlum 177 with a Ludlum 44-9 pancake probe, meter set on X1000. get 100 cpm, = 100, 000 cpm. The button made in...
46926
brianweber4@...
brianweber4
Jul 2, 2012 6:15 pm
Oh I see. I placed the A241 pellet directly resting on the SI-8B window, 400VDC & 4.7M anode resistor.It gave 200,000 CPM. ... From: "Happynewgeiger"...
46927
Happynewgeiger
happynewlaser
Jul 2, 2012 6:19 pm
Yes , that can be the difference as the alpha have a very low range . Anyway I suggest not to place open sources directly in contact of the probe sensible area...
