types of radiation are now usually distinguished by their origin: X-rays are emitted by  electrons  outside the nucleus, while gamma rays are emitted by the  nucleus . Pubblicato da SCM.dark.refractory.blogspot.com a 11/13/2010 06:27:00 p. Invia tramite email Postalo sul blog Condividi su Twitter Condividi su Facebook Etichette: Data , Technology Nessun