Search found 10788 matches

by Richard Hull
Sat Jun 23, 2018 8:19 am
Forum: Images du Jour
Topic: Deposition within a fusor
Replies: 4
Views: 859

Re: Deposition within a fusor

Of course what these patterns are is immaterial to the operation of a fusor, as is how they are made or by what mechanism. They are an observation that no one has written a scholarly paper on in these forums. The lozenges, diamond shaped patterns, are in perfect alignment with the re-combining beams...
by Richard Hull
Sat Jun 23, 2018 7:26 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Build a HV bias meter for free.
Replies: 9
Views: 1496

Re: Build a HV bias meter for free.

As noted above the accuracy of these free or $5.99 meters tends to rival that of a good Fluke or Beckman DVM. Mistakes blow up meters like leaving the meter on ohms and connecting it to 2kv. Or placing the meter in the 20ma current position and then measuring a 12 volt power buss. This particular is...
by Richard Hull
Sat Jun 23, 2018 6:39 am
Forum: New User Chat Area
Topic: Is baking worth it?
Replies: 16
Views: 1157

Re: Is baking worth it?

I have not glow cleaned in a couple of years. Instead, I drag the system down to about 12 microns with the mechanical pump and then turn on the diff pump and it goes into the 10e-4 torr range. I then differentially pump with D2. Thus, the junk is blasted out of the walls and D2 is buried in the shel...
by Richard Hull
Fri Jun 22, 2018 4:46 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Ballast resistor construction
Replies: 9
Views: 279

Re: Ballast resistor construction

It is always important to figure the load and voltage gobbling power of your ballast. the two 100k in series is 200k. Regardless of voltages fed, be it 10kv or 100kv, it is the current that is the player here. At 10ma into the fusor, you would loose 2kv in the ballast here and 20 watts of power. Two...
by Richard Hull
Sun Jun 17, 2018 5:03 am
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - Extensive paper on neutron activation
Replies: 12
Views: 1003

Re: FAQ - Extensive paper on neutron activation

Internet content, websites and data can disappear, websites die or be re-named, data that might prove dual use, get pulled off. Assume the internet is a place loaded with material that may or may not be there again, once found long ago. Whatever is in a book is there for as long as the book exists. ...
by Richard Hull
Sun Jun 17, 2018 4:49 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Atlas of Neutron Capture Cross Sections
Replies: 3
Views: 355

Re: Atlas of Neutron Capture Cross Sections

I recently got a soft cover version for $4.00 off ABE postpaid!! There appears to be a number of more recent compilations all in paper back/soft cover. Tons of 'em!!! You can learn a lot about nuclear physics just by roaming around in these tables, assuming you have a bit of background in nuclear ph...
by Richard Hull
Sat Jun 16, 2018 5:01 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Atlas of Neutron Capture Cross Sections
Replies: 3
Views: 355

Re: Atlas of Neutron Capture Cross Sections

I tend to use the book.....

"Table of Isotopes" Lederer, Hollander, Perlman

This can be found on ABE in both hardback and paper back, large size. Contains both easy to use tables and another section with the more complex decay path diagrams and energy levels.

Richard Hull
by Richard Hull
Sat Jun 16, 2018 4:41 am
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - Extensive paper on neutron activation
Replies: 12
Views: 1003

Re: FAQ - Extensive paper on neutron activation

The physical book I referred to is "Table of Isotopes" Lederer, Hollander, Perlman. I mentioned it twice in my PDF above. There are several to chose from.

Richard Hull
by Richard Hull
Fri Jun 15, 2018 6:42 pm
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - Extensive paper on neutron activation
Replies: 12
Views: 1003

Re: FAQ - Extensive paper on neutron activation

Yes, there is something about the handiness of a real book that this old guy appreciates. Got used to getting on the bus and going downtown or to a nearby college to get data from books and books alone until the 90's. Those old tomes are now available to own for little money to make up my own techni...
by Richard Hull
Thu Jun 14, 2018 9:35 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: What about "Liquid Scintillation vs. Pancake GM"?
Replies: 5
Views: 392

Re: What about "Liquid Scintillation vs. Pancake GM"?

I actually bought the little corrigator tool listed and shown in the Dec 6 posting back then. I have used it several times in other work. However, I just never got around to working with the scintillation system George noted. Sometimes stuff that seems cool just gets dropped in the push through life...