Search found 126 matches

by Bruce Meagher
Mon Jan 21, 2019 5:11 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Construction of Neutron Grade Fusor
Replies: 17
Views: 454

Re: Construction of Neutron Grade Fusor

Excellent job Enzo and dad! You guys have created a very nice setup. Couple comments: In the video when you were doing the unmoderated runs you sometimes drop the tube slightly behind the moderator. Leaving the moderator there will still present some thermal neutrons to the tube (explaining a few of...
by Bruce Meagher
Tue Jan 15, 2019 7:54 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: How to figure out the specs of old Rigaku scintillation tube probe?
Replies: 22
Views: 1139

Re: How to figure out the specs of old Rigaku scintillation tube probe?

I believe an NaI scintillator is the wrong device for optimizing a low energy ion beam. IMO, the very first step would be measuring the beam current with a faraday cup and an electrometer. Alpha’s from #1 will not make it through your window (edit: I assume you mean helium ions from an ion source no...
by Bruce Meagher
Fri Jan 11, 2019 6:19 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: How to figure out the specs of old Rigaku scintillation tube probe?
Replies: 22
Views: 1139

Re: How to figure out the specs of old Rigaku scintillation tube probe?

Harald, I’ll be following your efforts with much interest. I would imagine you’ll have to do a complete teardown to really understand what you have purchased. There is no way of knowing the signals on the connectors unless you reverse engineer the electronics inside (or get a schematic from Rigaku)....
by Bruce Meagher
Fri Jan 11, 2019 7:49 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Test Sources Po210+Be or U238+Be?
Replies: 15
Views: 714

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

Great job trying to answer my questions. The specific activities you found are accurate, and you correctly observed the huge difference. One thing you might not fully understand yet is what the units mean. A becquerel (Bq) is the unit of radioactivity. 1 Bq = one radioactive disintegration (decay) p...
by Bruce Meagher
Wed Jan 09, 2019 3:58 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Test Sources Po210+Be or U238+Be?
Replies: 15
Views: 714

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

Yes. Look up the specific activity of U238 and Po210. What does this tell us about the two substances? How much U238 would you need to create 1 million alphas/second? Can you find out approximately how many 4 - 5 MeV alphas/second are needed to create one neutron/second with the type of beryllium yo...
by Bruce Meagher
Mon Jan 07, 2019 8:32 pm
Forum: Vacuum Technology (& FAQs)
Topic: Cleaning/Repairing Edwards E2M5
Replies: 13
Views: 733

Re: Cleaning/Repairing Edwards E2M5

... I still need to find a proper inlet valve for gauging. I can't find anything so far for a good price. I need it to be a KF flange which is the biggest problem. Any recommendations? You could try <https://www.ebay.com/itm/292158415411> for $12.50 shipped. The image below is what I received. It d...
by Bruce Meagher
Sun Jan 06, 2019 4:56 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Creation, usage, and destruction of a cathode
Replies: 12
Views: 987

Re: Creation, usage, and destruction of a cathode

Great question! but i do not know for sure? my theory is that they would be the same because an X-ray is created by an exelorated electron that collides with a material 'brimsstraholing' and the power supply (voltage and current) is giving the electrons so i think it will be the same for the same V...
by Bruce Meagher
Sun Jan 06, 2019 6:15 am
Forum: Vacuum Technology (& FAQs)
Topic: The Importance of TC Gauge Calibration
Replies: 10
Views: 842

Re: The Importance of TC Gauge Calibration

Glad the gauge helped. Finn's sweet vacuum controller sure makes it easy for a quick measurement.
by Bruce Meagher
Sun Jan 06, 2019 6:11 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Creation, usage, and destruction of a cathode
Replies: 12
Views: 987

Re: Creation, usage, and destruction of a cathode

Enzo, I'd second Richard's warnings about the high voltage. You might consider getting a long (3'+) insulating rod to use as a pointer instead of using your hands. Best to train yourself early to minimize the chance of a mistake in the future. Also for your x-ray experiment what happens when you run...
by Bruce Meagher
Fri Jan 04, 2019 7:45 pm
Forum: Vacuum Technology (& FAQs)
Topic: MKS 901p
Replies: 58
Views: 10507

Re: MKS 901p

Rich, I don’t have any insight into your broken 901p, but can you dump of all the parameters? Cut and paste the following commands into your favorite terminal program when you’re connected to the device. @254PR1?;FF @254PR2?;FF @254PR3?;FF @254PR4?;FF @254BR?;FF @254AD?;FF @254RSD?;FF @254MD?;FF @25...