Form: 10-K

Annual report [Section 13 and 15(d), not S-K Item 405]

February 26, 2025


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), Ltd.
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 Medical GmbH
Germany
Sun Nuclear Corp.
Florida, USA
Sun Nuclear GmbH
Germany
Sun Nuclear B.V.
Netherlands


Leptant Annex, LLC
Delaware, USA
Dosimetry Badge, LLC
Connecticut, USA