Search found 1620 matches

by Dennis P Brown
Fri Jan 18, 2019 1:46 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: My progress II
Replies: 26
Views: 2608

Re: My progress II

Glad to hear about the lead shielding. There is no real need to concern yourself with neutron shielding. Maybe in the future but most fusors produce very safe levels of neutrons - even ones that can activate silver. As some here know, I am not a fan of water shielding around high voltage (but that i...
by Dennis P Brown
Fri Jan 18, 2019 1:28 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Construction of Neutron Grade Fusor
Replies: 7
Views: 215

Re: Construction of Neutron Grade Fusor

The 13-14 kV and a maximum of just 8 ma is not a voltage/power that generally yields many neutrons in most fusor systems (generally, 200 watts power is a better goal.) However, the high pressure can compensate in a small chamber for lower voltages but that is extremely low operating voltage/power. S...
by Dennis P Brown
Thu Jan 17, 2019 1:36 pm
Forum: Please Introduce Yourself
Topic: Hello Everyone!
Replies: 1
Views: 105

Re: Hello Everyone!

Best of luck on finding parts; do consider if your school has a proper vacuum pump and maybe a usable vacuum gauge for it. That can get you started on vacuum work and testing.
by Dennis P Brown
Thu Jan 17, 2019 1:33 pm
Forum: Images du Jour
Topic: Joe Gayo's Fusor - Neutron Detection Upgrade
Replies: 8
Views: 283

Re: Joe Gayo's Fusor - Neutron Detection Upgrade

I would think that your design for your 50 kV power supply would be a great post. You should consider that since that would be both useful and insightful for other people here. Also, maybe include your construction of your new 70 kV system, as well, as it progresses. Sharing methodologies and practi...
by Dennis P Brown
Wed Jan 16, 2019 10:52 pm
Forum: Images du Jour
Topic: Joe Gayo's Fusor - Neutron Detection Upgrade
Replies: 8
Views: 283

Re: Joe Gayo's Fusor - Neutron Detection Upgrade

Congratulations on really good work; few get both neutron detection via a tube and Ag activation for their first runs to join the neutron club.
by Dennis P Brown
Wed Jan 16, 2019 10:38 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: My progress II
Replies: 26
Views: 2608

Re: My progress II

Remember, 50 kV can and will produce a strong and very dangerous x-ray stream. Be certain you can measure that hazard as well - did you calculate the required lead thickness? Be certain the shield size is large enough to provide full protection to all body parts when the fusor is operating - don't o...
by Dennis P Brown
Tue Jan 15, 2019 5:49 pm
Forum: Images du Jour
Topic: Joe Gayo's Fusor
Replies: 20
Views: 527

Re: Joe Gayo's Fusor

I solder two copper end caps on the copper tube (the neutron detector is inside. I placed some electrical tape around both ends of the detector tube a such that it (the tube) makes a semi tight fit inside. Don't want it moving around.) One end has a proper co-axial connector fitted to the cap. The i...
by Dennis P Brown
Tue Jan 15, 2019 1:09 pm
Forum: Images du Jour
Topic: Joe Gayo's Fusor
Replies: 20
Views: 527

Re: Joe Gayo's Fusor

Nice work. Your detector system has a good bit of noise. I enclosed my neutron detector tube in a copper tube, electrically sealed both ends and had almost zero noise issues; however, rejection works as well. I'd like to see your activation results if it isn't too much extra work (and not needed - y...
by Dennis P Brown
Sun Jan 13, 2019 12:14 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Test Sources Po210+Be or U238+Be?
Replies: 15
Views: 655

Re: Neutron Test Sources Po210+Be or U238+Be?

Unless rules have changed, the commercial polonium source was available for rental (6 months.) But it was three years ago I looked into it. So, they might not allow it anymore. The neutron flux wasn't dangerous at all. I even saw someone use one to calibrate their neutron detector selling He tubes o...