Form: 10-K

Annual report pursuant to Section 13 and 15(d)

February 28, 2023


Exhibit 21.1

Mirion Technologies, Inc.

List of Subsidiaries

Mirion Technologies (TopCo), Ltd. Jersey
Mirion IntermediateCo, Inc. Delaware, USA
Mirion Technologies (HoldingSub1), Ltd. United Kingdom
Mirion Technologies (HoldingSub2), Ltd. United Kingdom
Mirion Technologies (US Holdings), Inc. Delaware, USA
Mirion Technologies (HoldingRep), Ltd. United Kingdom
Mirion Technologies (UK), Inc. United Kingdom
Mirion Technologies (Global), Ltd. United Kingdom
Mirion Technologies (US), Inc. Delaware, USA
IST Acquisitions, LLC Delaware, USA
Mirion Technologies (GDS), Inc. Delaware, USA
Mirion Technologies (Conax Nuclear), Inc. New York, USA
Mirion Technologies (Canberra), Inc. Delaware, USA
Mobile Characterization Services LLC New Mexico, USA
Materials Characterization Company LLC New Mexico, USA
Mirion Technologies (France) SAS France
Mirion Technologies (IST) Corporation New York, USA
Mirion Technologies (IST France) SAS France
Mirion Technologies (MGPI) SAS France
Mirion Technologies (Canberra) SAS France
Mirion Technologies (RADOS) Oy Finland



Mirion Technologies (Germany) GmbH Germany
Mirion Technologies (MGPI H&B) GmbH Germany
Mirion Technologies (Canberra) GmbH Germany
Mirion Technologies (IST) Limited United Kingdom
Mirion Technologies (Canberra UK) Limited United Kingdom
Mirion Technologies (UK Holdco), Ltd. United Kingdom
Mirion Technologies (HK) Limited Hong Kong
Mirion Commercial (Beijing) Co., Ltd. China
Mirion Technologies (IST Canada) ULC British Columbia, Canada
Mirion Technologies (Canberra CA) Ltd. Ontario, Canada
Mirion Technologies (Canberra BNLS) NV Zellik, Belgium
Mirion Technologies (Canberra Olen) NV Olen, Belgium
Mirion Technologies (Canberra) KK Japan
Mirion Technologies (Dosimetry Services) B.V. Netherlands
Mirion Technologies (Luxembourg) S.à r.l. Luxembourg
Mirion Technologies (Capintec), Inc. Delaware, USA
Mirion Technologies (Premium Analyse) SAS France
Mirion Technologies (Selmic) Oy Finland
Mirion Technologies Selmic Baltic OÜ Estonia
Mirion Technologies (AWST) GmbH Germany
Biodex Medical Systems, Inc. New York, USA
Sun Nuclear Corp. Florida, USA



Sun Nuclear GmbH Germany
Sun Nuclear B.V. Netherlands
Computerized Imaging Reference Systems, Inc. Vermont, USA
Safeline Monitors, LLC Connecticut, USA