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F_Schro
USA
4 Posts |
 Posted - 11/09/2015 : 14:45:55
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Trying to determine/compare sensitivity to soft xrays. Using a Victoreen 493 and the GMC-320plus and a high vacuum glass bottle with 1/2" tungsten rod's spaced about 1/16"
KVDC____493______________320plus
19_______0.35-0.34mr/Hr____0.037-0.039mr/Hr
22_______30-40mr/Hr________0.32-0.37mr/Hr
The GMC seems to be about 1/10th as sensitive as the 493.
If anyone has any ideas on this method or a better way please chime in.
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| Reply #1
ZLM
1261 Posts |
Posted - 11/09/2015 : 22:01:51
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This should be a calibration related. Not the sensitivities.
If you think the reading on KVDC-493 is correct reading, then change the GMC-320 calibration data to followings will get the same reading as your KVDC-493:
From GMC-320 main menu, select Init-Setup then Calibrate, you should see Calibrate 1, 2, 3.
on Calibrate 1, change the CPM from 60 to 6
on Calibrate 2, change the CPM from 240 to 24
on Calibrate 3, change the CPM from 1000 to 100 |
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| Reply #2
F_Schro
USA
4 Posts |
Posted - 11/10/2015 : 09:43:26
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My application is in detection of "possible" xray output of a high voltage/high vacuum device at various test voltages.
So calibration is less important to me then will the GMC320 detect these energies.
My problem is; The GMC detects fine if it's placed very close the the generator but my test calls for the GM tube to be placed 3FT from the source.
Sorry, did I post this question in the wrong forum ?
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| Reply #3
Distelzombie
Germany
202 Posts |
Posted - 11/10/2015 : 21:30:45
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Regarding the almost same size of the detectors, I would say the X-Rays aren't of a high enough energy to be detected by the M4011 tube of the 320.
But I'm no scientist nor a native English speaker, so , don't take whatever you read for granted. :D
You could try to open the casing and measure again, with the tube facing the source. This makes a almost 10 times increase in Beta-Ray detection, so maybe that helps.
Don't know why the engineers had build it that sealed though. It seems rather stupid. Sry guys. :P |
GMC-300E+ V4.20 with sbt-11a alpha tube
My statements are "stuff-a-hobbyist-says" and not in any way professional. |
Edited by - Distelzombie on 11/10/2015 21:47:38 |
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| Reply #4
F_Schro
USA
4 Posts |
Posted - 11/16/2015 : 14:00:55
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Well I would have checked without the case but the manufacture was nice enough to accept a return if it was not sensitive enough for my application so I didn't crack it open.
But compared to my old Victoreen it was about 1/10th as sensitive to whatever energies this source has.
My voltage levels are less than 30KVDC and the contacts are round rod shaped with no angle on the anode.
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| Reply #5
Distelzombie
Germany
202 Posts |
Posted - 11/16/2015 : 17:17:36
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Ok. But you don't need to "crack" it open. It has screws.
And why Voltage? I see nobody talking about voltage, only model numbers. But maybe I'm just confused. :) |
GMC-300E+ V4.20 with sbt-11a alpha tube
My statements are "stuff-a-hobbyist-says" and not in any way professional. |
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Sensitivity of 320plus to xray
