Search found 164 matches

by iRad
15 Feb 2021, 10:36
Forum: Introductions >> Start Here !
Topic: Hello from Brian in Chicago
Replies: 7
Views: 701

Re: Hello from Brian in Chicago

Brian Your probe is showing very low background for a probe its size, even at higher than usually necessary voltage (only up to about 3000 cpm). That unfortunately means that it is probably too bad to be of much use. I'm sorry to say that a probe like that is considered next to impossible for an ama...
by iRad
13 Feb 2021, 09:00
Forum: Introductions >> Start Here !
Topic: Hello from Brian in Chicago
Replies: 7
Views: 701

Re: Hello from Brian in Chicago

Brian - If PRA sees the GS-PRO as a sound card, then Therimino will as well. Make sure you are not unplugging the GS- PRO between program sessions, as that will cause a problem with Windows applications recognizing the device. You should plug the GS-PRO in at the beginning of your Windows session an...
by iRad
08 Feb 2021, 00:37
Forum: Spectrum
Topic: Lanthanum 100g 99.9% (with significant Ac227) contamination
Replies: 5
Views: 663

Re: Lanthanum 100g 99.9% (with significant Ac227) contamination

Nice work Ben. I'm glad to see that the Hamamatsu R6233 is working well with the 63X63 crystal. Nice build. Tom
by iRad
01 Feb 2021, 05:33
Forum: Detectors
Topic: What Is Too Much?
Replies: 7
Views: 1274

Re: What Is Too Much?

That wire looks homemade, but easy enough to make and should do the job. Ludlum's own solution is seen on the first Ludlum on the right (model 9 I think). Built directly into the clasps that hold the can onto the instrument. The clasps are usually riveted to the can, but the cans will interchange be...
by iRad
31 Jan 2021, 10:47
Forum: Introductions >> Start Here !
Topic: Hello from Brian in Chicago
Replies: 7
Views: 701

Re: Hello from Brian in Chicago

Good to see you here Brian. Enjoy the journey, it's more than half the fun.
by iRad
21 Dec 2020, 00:41
Forum: Detectors
Topic: Mirion PDS 100G, Spectrometric Personal Radiation Detector
Replies: 116
Views: 44636

Re: Mirion PDS 100G, Spectrometric Personal Radiation Detector

Will - The BT connection issue has been discussed previously in this thread. Seems to be very spotty and prone to drop connection even after established. Make sure the PDS batteries are fully charged and that the PDS is very close to your laptop when making the connection, as this "may" help. I also...
by iRad
16 Dec 2020, 01:30
Forum: Introductions >> Start Here !
Topic: Hello from Ben in Germany / UK
Replies: 4
Views: 1182

Re: Hello from Ben in Germany / UK

Hi Ben, Glad to see you here and look forward to your contributions. It would be great to see a DIY kit based on a device like the ESP32 (Bluetooth or WiFi) and easily integrated with a detector, something that can wirelessly send signals directly to a mobile device in real time with enough resoluti...
by iRad
30 Nov 2020, 00:48
Forum: Shielding
Topic: Lead Castle Rebuild And Detector Swap
Replies: 11
Views: 2484

Re: Lead Castle Rebuild And Detector Swap

Yes I meant to say 75k. Mine are all 75 kOhm base value between dynodes. Perhaps that is why yours say's "MODIFIED" that yours is double the value of mine. I figured to modify these myself to work with more common hobby bias supplies someday when I get a chance... As far as output on the GS-PRO, per...
by iRad
29 Nov 2020, 10:29
Forum: Shielding
Topic: Lead Castle Rebuild And Detector Swap
Replies: 11
Views: 2484

Re: Lead Castle Rebuild And Detector Swap

I have quite a few of them, and I think they are all 75 kOhm between dynodes. I'm sure they custom made them often to customer spec. A Canberra 3106D is the perfect HV supply to drive them. To bad they are too low for the GS, even at 150k.

Notice the Purple, Green, Orange, Gold 4-color resistors...