# Actinide Nanoparticles: Revising Early Developments and Recent Insights from High‐Energy‐Resolution Fluorescence‐Detected X‐Ray Absorption Near Edge Structure and Synchrotron Techniques

## TL;DR

This paper reviews the study of actinide nanoparticles and recent advances in understanding their structure using advanced X-ray techniques.

## Contribution

The paper highlights recent progress in characterizing actinide nanoparticles using high-energy-resolution fluorescence-detected X-ray absorption techniques.

## Key findings

- High-energy-resolution fluorescence-detected X-ray absorption techniques have improved understanding of actinide nanoparticle structure.
- Synchrotron-based methods are crucial for analyzing the oxidation state and atomic structure of actinide nanoparticles.

## Abstract

Actinide nanoparticles (NPs) are widely recognized for their role as a potentially highly mobile form of radioactive contaminants in the environment. In recent years, research has increasingly focused on elucidating their formation mechanisms, atomic structure, and physicochemical properties. The application of synchrotron radiation techniques is central to the detailed characterization of their atomic structure and oxidation state. This review retraces the evolution of actinide NPs research and highlights recent achievements enabled by high‐energy‐resolution fluorescence‐detected X‐ray absorption near edge structure, used in correlation with complementary synchrotron‐based methods.

Actinide nanoparticles are relevant to nuclear waste storage, environmental safety, advanced nuclear fuel engineering, and fundamental science. Herein, this review traces the early developments of the field and the recent progress enabled by the use of high‐energy‐resolution fluorescence‐detected X‐ray absorption near edge structure in synergy with other synchrotron techniques.© 2026 WILEY‐VCH GmbH