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 (RADOS) GmbH i. L.	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
Gammex, Inc.	Wisconsin, USA
Sun Nuclear GmbH	Germany
Sun Nuclear B.V.	Netherlands

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