In reply to [email protected]'s message of Thu, 06 Jan 2011 13:22:33 +1100: Hi, [snip] Oops! >These positrons should produce annihilation gammas when interacting with >electrons from the metal. 58% of the 511 keV gammas would get through the 2 cm >lead shielding, and be very readily detected.
That should be 12.6 %! Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/Project.html
