Im trying to get on of these NE St-6's working I have posted pictures of the unit and the connectors. I dont know much about these units. I am trying to use a...
2536
GEOelectronics
K0FF
Jan 2, 2005 5:24 pm
Two detectors are generally used, along with a coincidence detector. This setup looks for one event that affects both detectors at the same time, and ignores...
2540
retrocalc
Jan 3, 2005 1:53 pm
Not sure who to ask, so this sounded like a group question. I know that the old ionization chambers used electrometer tubes. There are really high impedance...
2541
Chris Smolinski
lastoneouttu...
Jan 3, 2005 2:28 pm
... Ultra low input bias current opamps are generally used. The AD549 is one such opamp that is often used. -- ... Chris Smolinski Black Cat Systems ...
2542
jeff_wilkinson_1
jeff_wilkins...
Jan 3, 2005 11:02 pm
Chris is correct about the AD549. I'm doing this from memory, but I believe that is the really high impedance, high priced IC. They have a few others (search...
2543
jeff_wilkinson_1
jeff_wilkins...
Jan 3, 2005 11:12 pm
Ok, who knows about the relationship between X-ray machine KeV ratings, tube currents and the resultant X-ray photons? I'm interested in quantifying the output...
2544
Geo
K0FF
Jan 4, 2005 2:36 am
I think a good ion-chamber using a vibrating/switched capacitance type probe pickup would be ideal. Second would be a cutie-pie. Search Victoreen 440-RF/C ...
2545
retrocalc
Jan 4, 2005 4:49 am
Thanks for the info! I'm reading the data sheet. The AD549 looks like an amazing little gizmo....
2546
Craig
siliconhillb...
Jan 4, 2005 4:43 pm
Also check out the National Semiconductor "low input bias current" opamps. I don't have part numbers handy, but some are rated in the femtoamp range (xE-15)....
2547
Craig
siliconhillb...
Jan 4, 2005 9:36 pm
I looked up the PN of the Nat. Semi. part: LMC6001 http://www.national.com/pf/LM/LMC6001.html#Datasheet Cheapest version is $1.50 in quantity. I have some...
2548
GEOelectronics
K0FF
Jan 5, 2005 12:23 am
The TSA HHD440 is a complex instrument that has a computer inside, and a nice large block of plastic scintillator with integral PMT. Recently I was able to get...
2549
GeigerCounterEnthusia...
Jan 5, 2005 4:03 am
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the GeigerCounterEnthusiasts group. File...
2550
jeff_wilkinson_1
jeff_wilkins...
Jan 5, 2005 4:11 am
... Jim Ziegler, formerly at IBM, has written a lot of information on cosmic ray cascades. His best overview is available online at: ...
2551
Justin
-harlequin-
Jan 5, 2005 12:25 pm
... detectors is ... plastic ... simple ... or MCA ... AFAICS, you wouldn't need NaI, nor a SCA or MCA. Plastic may be less useful than NaI for energy...
2552
Geo
K0FF
Jan 5, 2005 6:32 pm
Maybe, but plastics are not generally used for pulse height analysis: "Very thin scintillators have been used for alpha detection, somewhat thicker...
2553
Ken
phixer36
Jan 5, 2005 7:37 pm
What does everyone think about the Gamma-Scout geiger counter?? Keep running across it on the net and looks interesting as a general- purpose detector. Not...
2554
Geo
K0FF
Jan 5, 2005 9:07 pm
Excellent unit. Mainly a dosimeter I think. I have one. Not as versitile as the Blackcatsystems units by far for science use, but it is a good pocket...
2555
dax_italy
Jan 5, 2005 10:40 pm
George you know what i think about this unit. Software inside is too slow,and not so sensible...ecc ecc... Dax ... only...
2556
GEOelectronics
K0FF
Jan 6, 2005 1:34 am
From: Brooke Clarke <brooke@p...> Date: Wed Jan 5, 2005 12:14 pm Subject: I have fixed the links so here is an updated version: Welcome Aboard! ...
2557
DH
revtkatt
Jan 6, 2005 3:31 am
... <jeffrey.wilkinson@u...> wrote: At airplane altitudes ... pions ... FWIW, with transistor dimensions shrinking and memory volumes increasing, soft errors...
2558
Jim
jim7839
Jan 7, 2005 2:41 am
Does anyone have a handle for a CDV715 or any of the similar models laying around that they would part with. I want to put it on a CDV700 because I will not...
2565
Jim
jim7839
Jan 7, 2005 10:34 pm
I have looked all over but not found what is being done to make the reset push button work on the some of the LENi counters I see in the file section. I...
2567
Geo
K0FF
Jan 8, 2005 1:50 am
I use a zero ohm resistor. Any small value is fine. Geo ... the ... the...
2568
jeff_wilkinson_1
jeff_wilkins...
Jan 8, 2005 3:06 am
Well, I tried the X-ray detection using a PMT coupled to a NaI(Tl) crystal. It's a Saint-Gobain unit that I purchased on eBay, hermetically sealed in a 0.020"...
2569
Geo
K0FF
Jan 8, 2005 3:47 am
Cool.You can measure the total ohmic resistance with a meter, and derive the resistor values from that figure. Geo ... As a ... tell ... from an ... week....
2570
tychounder
Jan 8, 2005 4:23 am
Hey Geo, Some time back, you converted one of those otherwise rather useless CDV ion chamber detectors into a sensitive alpha detector by boring a hole in the...
2571
Geo
K0FF
Jan 8, 2005 5:27 am
-See message #963 on this board. I used a 1-1/4" hole saw ( I think). Here are the instructions in a nutshell: A)Cut hole. B) Cover hole with Mylar ( never...
2572
tychounder
Jan 8, 2005 10:30 am
Thanks George, I saw the tricorder post on mssg 983, and missed the $5 Alpha detector post on mssg#963! I was close. I might even buy one of these just to try...
2574
Craig
siliconhillb...
Jan 8, 2005 4:36 pm
Another thought. As long as the relative humidity is below 50% or therebouts, you should be able to use a piece of copper screen wire (window size mesh) to...
2579
Geo
K0FF
Jan 8, 2005 4:51 pm
Yes that should work, and I have used one with no cover at all, but suffered the interference from electrical fields, of course that is one of the tricorder...
