Search found 128 matches

by Bruce Meagher
Fri Mar 16, 2012 6:32 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Resolution of several NaI(Tl) detectors
Replies: 4
Views: 2777

Re: Resolution of several NaI(Tl) detectors

<t>Carl, thanks for taking the time to respond to my post. Your suggestions are extremely helpful.<br/> <br/> On the warm up issue I have observed some drift vs time/temperature. In fact, I observe a drift on all the detectors from the morning over several hours. I've used the pulser to eliminate ev...
by Bruce Meagher
Thu Mar 15, 2012 9:39 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Resolution of several NaI(Tl) detectors
Replies: 4
Views: 2777

Resolution of several NaI(Tl) detectors

<t>I recently acquired a basic gamma spectroscopy system. Currently, it consists of:<br/> <br/> 1) Tracor Northern TN-7200 multichannel analyzer (supports both pulse height analysis and multichannel scaling)<br/> 2) A NIM bin containing an Ortec 485 amplifier, Ortec 556 HV power supply, and a Tennel...
by Bruce Meagher
Mon Aug 29, 2011 12:34 am
Forum: Images du Jour
Topic: Archived - West Coast HEAS Realtime Pictures
Replies: 13
Views: 5854

Re: West Coast HEAS Realtime Pictures

What a fantastic gathering! It was a pleasure meeting you all in person. I feel privileged to have witnessed so many neutrons flying by. Jon, your fusor setup, lab, and machine shop are amazing. Truly inspiring.

Thanks for opening up your house.

Bruce
by Bruce Meagher
Fri Jul 29, 2011 10:36 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor Chamber 101
Replies: 7
Views: 3817

Re: Fusor Chamber 101

<t>Hi George,<br/> <br/> Your designs are inspiring! One thing I noticed on your setup is the lack of a roughing line port just below the chamber above some type of butterfly valve. Will you use one of the ports on the chamber for this, or is this a design feature of your super small pump? If you've...
by Bruce Meagher
Tue Jul 26, 2011 4:03 pm
Forum: Vacuum Technology (& FAQs)
Topic: Diffusion Pumps 101
Replies: 25
Views: 11009

Re: Diffusion Pumps 101

<t>Hi Chase,<br/> <br/> I believe to answer your question you need to understand the kinetic theory of gases, laws of flow of gases (particularly through small capillaries), and the accommodation coefficient of the oil vapor. I've been reading Vacuum Techniques by Saul Dushman and he has a very deta...
by Bruce Meagher
Tue Jun 28, 2011 8:45 pm
Forum: Vacuum Technology (& FAQs)
Topic: Vacuum pressure measurements
Replies: 5
Views: 2806

Re: Vacuum pressure measurements

<t>Richard,<br/> <br/> Thanks for the encouragement and the additional thermocouple gauge info. I know I've only just scratched the surface on vacuum, and I look forward to learning more.<br/> <br/> I recently purchased a used Veeco 300 pumping station so in the coming months I plan to acquire some ...
by Bruce Meagher
Sun Jun 26, 2011 5:41 am
Forum: Vacuum Technology (& FAQs)
Topic: Vacuum pressure measurements
Replies: 5
Views: 2806

Re: Vacuum pressure measurements

<t>Thanks Dave for the tips, and I'll look at the Welch, Lesker, and bell jar sites to dig up more info to continue to learn. The FAQ section has been (and continues to be) most helpful!<br/> <br/> I've ordered Scientific Foundations of Vacuum Technique. Second Edition by Saul Dushman and James Laff...
by Bruce Meagher
Fri Jun 24, 2011 4:52 pm
Forum: Vacuum Technology (& FAQs)
Topic: Vacuum pressure measurements
Replies: 5
Views: 2806

Vacuum pressure measurements

<t>I've taken my first baby step on my journey so I thought I'd share my progress.<br/> <br/> I recently acquired a roughing pump (Japan Electric Industries rotary vane pump), some thermocouple vacuum gauge tubes, and a vacuum gauge controller (Varian 810) from a kind hearted forum member. My only e...