EN ISO 16795:2025 PDF

Name: EN ISO 16795:2025 — Nuclear energy - Determination of Gd2O3 content in pellets containing uranium oxide by X-ray fluorescence spectrometry (ISO 16795:2024)
SKU: EN ISO 16795:2025
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Nuclear energy - Determination of Gd2O3 content in pellets containing uranium oxide by X-ray fluorescence spectrometry (ISO 16795:2024)

Название (английский):

EN ISO 16795:2025

Nuclear energy - Determination of Gd2O3 content in pellets containing uranium oxide by X-ray fluorescence spectrometry (ISO 16795:2024)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 15
Дата публикации:: 20 августа 2025 г.
Издание:: CEN EN 16795 edition 1 version 1
ICS:: 27.120.30

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Описание (английский):

This document specifies a method which covers the determination of Gd2O3 content in UO2 fuel pellets, by X-ray fluorescence spectrometry. Either wave dispersion X-ray fluorescence (WD-XRF) or energy dispersion X-ray fluorescence (ED-XRF) is applicable, however, this document states a method by using WD-XRF using Gd Lα-line. This method has been tested for mass fractions of from 2 % to 10 % Gd2O3.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты EN

Overview

EN ISO 16795:2025 (adopted from ISO 16795:2024) specifies a validated method for the determination of Gd2O3 (gadolinium oxide) mass fraction in UO2 fuel pellets by X‑ray fluorescence spectrometry (XRF). The document defines a procedure using wavelength-dispersive XRF (WD‑XRF)-measuring the Gd Lα line-as the stated method, while also noting that energy‑dispersive XRF (ED‑XRF) is applicable. The method has been tested for Gd2O3 mass fractions from 2% to 10% and covers sample preparation, calibration, measurement and reporting requirements.

Key Topics

Scope and principle

Determination of Gd2O3 content in sintered (U,Gd)O2 pellets by XRF; signal intensity of the selected L X‑ray line is proportional to Gd concentration.

Apparatus and instrumentation

Sequential X‑ray spectrometer with precision goniometer, LiF 200 analyzer crystal, scintillation/flow detectors, multi‑channel analyser, ~3 kW X‑ray generator.
Supporting equipment: pellet press, analytical balance (±0.1 mg), powder blender/shaker, sintering furnace (≈1 800 °C).

Standards and calibration

Preparation of standard pellets (UO2 + Gd2O3) sintered and fabricated under controlled conditions; calibration curve established across 2–10% Gd2O3.
Requirements for metrological traceability of reference materials per ISO 17034 or ASTM C1128 for working standards.

Sample preparation

Blending dried powders, pressing and sintering pellets under the same conditions as fuel production, polishing the pellet face (e.g., 800‑grit SiC), and cleaning prior to analysis.

Measurement controls

Angle calibration (example 2θ ≈ 61.115°), pulse‑height distribution, background correction and stability/sensitivity checks; automatic data acquisition and evaluation.

Precision, accuracy and reporting

Clauses include precision/accuracy evaluation and required content of the test report.

Applications

Quality control in nuclear fuel fabrication for verifying Gd2O3 loading in UO2 pellets.

Production process control for laboratories performing acceptance testing of doped fuel pellets.

Metrology and accreditation labs establishing calibration curves and traceable reference materials for fuel analysis. Who uses this standard: nuclear fuel manufacturers, analytical laboratories in the nuclear industry, regulatory bodies, and metrology institutes involved in nuclear material characterization.

Related Standards

ISO 16795:2024 (original ISO text)

ISO 17034 - competence of reference material producers

ASTM C1128 - guide for preparation of working reference materials for nuclear fuel cycle analyses

Keywords: EN ISO 16795:2025, ISO 16795:2024, Gd2O3 determination, UO2 fuel pellets, X‑ray fluorescence spectrometry, WD‑XRF, Gd Lα line, calibration curve, nuclear fuel quality control.

EN ISO 16795:2025 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Related Standards

Технические детали

ISO 16795:2024

Nuclear energy — Determination of Gd2O3 content in pellets containing uranium oxide by X-ray fluorescence spe…

ISO 17034:2016

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