Development and validation of a methodology for uranium radiochronometry reference material preparation.

Area of Science:

• Nuclear Chemistry
• Radiochemistry
• Analytical Chemistry

Background:

• Accurate determination of uranium material age is crucial for nuclear forensics and safeguards.
• Existing methods require reliable reference materials for validation and quality control.

Purpose of the Study:

• To develop and validate a methodology for preparing a reference material for uranium dating.
• To establish a reliable tool for determining the production date of uranium materials using the (230)Th/(234)U radiochronometer.

Main Methods:

• Preparation of a reference material from highly enriched uranium with complete thorium separation.
• Verification of thorium removal using gamma spectrometry and a (232)Th tracer.
• Validation by comparing measured (230)Th/(234)U ratios with calculated values over time.

Main Results:

• Successfully prepared a reference material with zero initial daughter nuclide concentration.
• Verified complete elimination of thorium from the uranium material.
• Demonstrated accurate age determination through comparison with theoretical decay rates.

Conclusions:

• The developed methodology provides a reliable reference material for uranium age determination.
• This reference material is suitable for quality control in nuclear forensics and safeguards.
• The prepared material aids in method validation for (230)Th/(234)U radiochronometry.