Search found 111 matches

by Joe Gayo
Sun May 19, 2019 3:38 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Ludlum 12-4-7 Dose Conversion
Replies: 1
Views: 3208

Ludlum 12-4-7 Dose Conversion

A have a calibrated Model 12-4-7 placed equidistant (and equal angle to my cylindrical systems) between to fusors to compare NPR. This arrangement is allowing me to compare performance of various modifications. I would like a second check of my method for converting the dose read out to NPR. The det...
by Joe Gayo
Sun May 19, 2019 12:49 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Ludlum 42-31
Replies: 10
Views: 6529

Re: Ludlum 42-31

I definitely have a BF3 tube and the sweet spot is 1850V. Thank you, everyone, for your help.

P.S. I now have 2 NIM electronic detection systems, 1 portable electronic system, and a bubble dosimeter.
by Joe Gayo
Sat May 18, 2019 8:54 pm
Forum: Announcements and Site Administration Topics
Topic: Joe Gayo's Lab Tour
Replies: 14
Views: 9614

Re: Joe Gayo's Lab Tour

https://www.youtube.com/channel/UCu4DHf ... subscriber

EDIT: Sunday, May 26th at 12 noon PDT
by Joe Gayo
Fri May 17, 2019 5:06 am
Forum: Announcements and Site Administration Topics
Topic: Joe Gayo's Lab Tour
Replies: 14
Views: 9614

Re: Joe Gayo's Lab Tour

I'll post a link to the feed with a date and time if there is sufficient interest.
by Joe Gayo
Fri May 17, 2019 5:05 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Ludlum 42-31
Replies: 10
Views: 6529

Re: Ludlum 42-31

Bob,

Just so I'm clear you have a 42-31 and bias it at 1900V, or you are talking about BF3 tubes in general.

Thanks, Joe
by Joe Gayo
Wed May 15, 2019 12:10 am
Forum: Announcements and Site Administration Topics
Topic: Joe Gayo's Lab Tour
Replies: 14
Views: 9614

Joe Gayo's Lab Tour

I now have 2 working fusion systems (testing two different electrode geometries) and several more in the works. I was thinking about hosting a "live" youtube tour of my lab where I could answer questions about my systems. Is there any interest?
by Joe Gayo
Wed May 15, 2019 12:06 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Ludlum 42-31
Replies: 10
Views: 6529

Re: Ludlum 42-31

I see some reasonable response at 1100 - 1200 V but I have the secondary amplifier gain set significantly higher (128x versus 4x) than my other detection system. I suspect that I need to raise the voltage but I'm reluctant since I don't want to damage my tube.
by Joe Gayo
Sun May 12, 2019 7:27 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Ludlum 42-31
Replies: 10
Views: 6529

Ludlum 42-31

I'm trying to figure out the correct operating voltage for this tube (Ludlum 42-31). The website for Model 42-31H Neutron Detector says 1200V but the LND referenced by the same page says 750V (https://www.lndinc.com/products/neutron-detectors/25185/). It's also very possible that the "H" means He3 a...
by Joe Gayo
Fri Apr 26, 2019 11:29 pm
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - Extensive paper on neutron activation
Replies: 13
Views: 11417

Re: FAQ - Extensive paper on neutron activation

I think you meant Manganese 55