Dictionary.com
Thesaurus.com

isotron

British  
/ ˈaɪsəˌtrɒn /

noun

  1. physics a device for separating small quantities of isotopes by ionizing them and separating the ions by a mass spectrometer

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of isotron

C20: from isotope + -tron