Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs Twitter LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Calculators Education Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings RF Cafe Archives Test Notes RF Cascade Workbook RF Stencils for Visio Shapes for Word Thank you for visiting RF Cafe!

Brown, Lead Underpants Moments?

Brown, Lead-Underpant Moments - RF CafeI normally avoid a headline like that, but Rajan Bedi, author of this short story on proton radiation susceptibility testing, really seems to like the term since it is used repeatedly throughout. It is funny and conjures up a number of less-than-flattering images. We are accustomed to reading about testing with electromagnetic beams (cosmic rays, x-rays, microwaves, mm-waves, etc.) and electron beams (beta rays), but proton beams (alpha rays) are mostly an unfamiliar entity. Most of us can tell you how to create the former, but how about creating the latter, and why is there a need to test for susceptibility to them? How do you shield against alpha rays? Fast-moving protons, being large and heavy, can dislodge atoms from semiconductor lattices, potentially affecting a circuit. Proton beams are generated using nuclear accelerators. Spaceborne platforms are particularly vulnerable. The test setup described used thick, paraffin-impregnated blocks, which I always thought were used for blocking neutrons, not protons, so maybe that is the secondary radiation mentioned. If the proton source is anything other than a hydrogen atom (not deuterium or tritium), then it probably has a neutron or two attached to it. Brown, lead underpants, though, will stop the protons.

Brown, Lead Underpants Moments? - RF Cafe



Posted  March 2013
 

Try Using SEARCH to Find What You Need.  >10,000 Pages Indexed on RF Cafe !

Copyright 1996 - 2016
Webmaster:  Kirt Blattenberger, BSEE - KB3UON
Family Websites:  Airplanes and Rockets | Equine Kingdom

All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledged.