Exhibit 21.1
Mirion Technologies, Inc.
List of Subsidiaries

Mirion IntermediateCo, Inc. | Delaware, USA
Mirion Technologies (US Holdings), Inc. | Delaware, USA
Mirion Technologies (HoldingRep), Ltd. | United Kingdom
Mirion Technologies (Global), Ltd. | United Kingdom
Mirion Technologies (US), Inc. | 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 (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

LLEPTANT ANNEX, LLC | Delaware, USA
Safeline Monitors, LLC | Connecticut, USA
Crimson Engineered Solutions, L.L.C. | Texas, USA
WCI-Gigawatt Intermediate-Holdco, LLC | Delaware, USA
WCI-Gigawatt Midco, LLC | Delaware, USA
WCI-Gigawatt Purchaser, LLC | Delaware, USA
Paragon Energy Solutions, LLC | Delaware, USA
Paragon-Rock Creek, LLC | Delaware, USA
66 MPH, LLC | Kansas, USA