Search found 1616 matches

by Dennis P Brown
Wed Jan 16, 2019 10:52 pm
Forum: Images du Jour
Topic: Joe Gayo's Fusor - Neutron Detection Upgrade
Replies: 7
Views: 140

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: 23
Views: 2477

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: 484

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: 484

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: 634

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...
by Dennis P Brown
Sat Jan 12, 2019 9:40 am
Forum: New User Chat Area
Topic: Rules for Claiming Fusion Clarification
Replies: 10
Views: 527

Re: Rules for Claiming Fusion Clarification

I second that point, that is a very well done setup. I assume you have a neutron detector (the image of the plastic box with leads.) If so, data counts vs time with and without the moderator. Its a good idea to do at least one run without deuterium to get a noise baseline with the plasma (at normal ...
by Dennis P Brown
Fri Jan 11, 2019 5:39 pm
Forum: New User Chat Area
Topic: Silver Solder for HV Insulator
Replies: 9
Views: 305

Re: Silver Solder for HV Insulator

Seriously, if you are worried about the ceramic insulator heating up enough to damage/compromise your joint, do as I did. Install a small inexpensive fan to keep a constant air flow. The shape of the insulator is ideal for that type of cooling method.
by Dennis P Brown
Fri Jan 11, 2019 12:36 pm
Forum: Fusion --- Past, Present, and Future
Topic: Wendelstein 7-X has successfully finished its second major experimental run
Replies: 27
Views: 1794

Re: Wendelstein 7-X has successfully finished its second major experimental run

In the article on deuterium enrichment via membranes, the process has to occur at liquid nitrogen temperatures (not exactly conducive for water to be directly processed - lol.) The process they describe takes a mixture of gases of hydrogen (H2)and deuterium (D2)and separates these. There are no sour...
by Dennis P Brown
Fri Jan 11, 2019 12:08 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Test Sources Po210+Be or U238+Be?
Replies: 15
Views: 634

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

Once again, I will be the person talking safety of materials - beryllium is toxic and should only be handled with gloves (that are disposed of after a single use) and still, wash your hands. The beryllium should be stored in a sealed plastic bag. Disposal is an issue; I assume you have studied that ...