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Related Experiment Video

Updated: Jul 28, 2025

Low-energy Cathodoluminescence for OxyNitride Phosphors

Low-energy Cathodoluminescence for OxyNitride Phosphors

Published on: November 15, 2016

Liquid scintillation counting of electrons from internal conversion for quantifying

Romain Coulon¹, Sammy Courte¹, Carine Michotte¹

¹Bureau International des Poids et Mesures (BIPM), 92312, Sèvres, France.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine

|June 4, 2023

Summary

Researchers improved the measurement of Cadmium-109 (Cd-109) activity using liquid scintillation counting. Summing signals from three photomultiplier tubes enhanced energy resolution, achieving 0.5% uncertainty.

Keywords:

(109)Cd Activity measurement Liquid scintillation Spectral unfolding Standardization techniques

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Last Updated: Jul 28, 2025

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Radiolabeling and Quantification of Cellular Levels of Phosphoinositides by High Performance Liquid Chromatography-coupled Flow Scintillation

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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

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Published on: May 28, 2016

Area of Science:

Nuclear Metrology
Radiochemistry
Spectroscopy

Background:

Accurate activity measurement of Cadmium-109 (Cd-109) is crucial for calibrating gamma-ray spectrometers.
Liquid scintillation counting (LSC) is a common method for radionuclide activity determination.
A key challenge in LSC for Cd-109 is the spectral overlap between conversion electrons and other decay products, impacting measurement precision.

Purpose of the Study:

To develop and validate a method for precise Cd-109 activity measurement within the CCRI(II)-K2.Cd-109.2021 international key comparison.
To improve the energy resolution of a liquid scintillation counter to minimize spectral overlap.
To achieve a low relative standard uncertainty in Cd-109 activity estimation.

Main Methods:

Utilized a liquid scintillation counter equipped with three photomultiplier tubes (PMTs).
Implemented a signal summation technique from the three PMTs to enhance energy resolution.
Applied a specific spectral unfolding approach to resolve overlapping spectral components.

Main Results:

The signal summation method effectively improved energy resolution, reducing peak overlap.
The spectral unfolding successfully separated the contributions of conversion electrons and other decay products.
An activity estimation for Cd-109 was achieved with a relative standard uncertainty of 0.5%.

Conclusions:

The developed method, combining PMT signal summation and spectral unfolding, significantly enhances the precision of Cd-109 activity measurements using LSC.
This approach addresses the critical challenge of spectral overlap in LSC, paving the way for more accurate radionuclide metrology.
The achieved uncertainty of 0.5% demonstrates the effectiveness of the technique in international key comparisons.