Exhibit 21 METRIKA SYSTEMS CORPORATION Subsidiaries of the Registrant At February 20, 1998, Metrika Systems Corporation owned the following companies: Registrant's State or Jurisdiction % of Name of Incorporation Ownership ------------------------------------------------------------------------ Eberline Radiometrie S.A. France 100 Thermo Instruments Systems Ltd. UK 100 Eberline Radiometrie GmbH Germany 100 Gamma-Metrics California 100 Gamma-Metrics International F.S.C. Inc. Guam 100 Radiometric U.S.A., Inc. California 100