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Updated: Oct 28, 2025

Fluorescent Nanoparticles for the Measurement of Ion Concentration in Biological Systems

Fluorescent Nanoparticles for the Measurement of Ion Concentration in Biological Systems

Published on: July 4, 2011

A biokinetic model for systemic sodium.

Caleigh Samuels¹, Rich Leggett¹

¹Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN, 37831, United States of America.

Journal of Radiological Protection : Official Journal of the Society for Radiological Protection

|July 14, 2021

Summary

This summary is machine-generated.

An updated biokinetic model for systemic sodium (Na) enhances accuracy in tracking radioactive sodium movement and transfer in the body. This improved model aids in better dose assessments for workers and specific populations.

Keywords:

biokinetic model sodium systemic

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Area of Science:

Radiological Protection
Biokinetics
Internal Dosimetry

Background:

The International Commission on Radiological Protection (ICRP) requires updated models for assessing occupational radionuclide intake.
Previous sodium (Na) biokinetic models lacked detailed representation of Na movement and recycling within the body.

Purpose of the Study:

To describe an updated biokinetic model for systemic sodium (Na).
To improve the accuracy of dose coefficients for radioactive sodium isotopes (e.g., 22Na, 24Na).
To facilitate the extension of dose assessments to various age groups and specific exposure scenarios.

Main Methods:

Development of a new biokinetic model for systemic sodium (Na).
Incorporation of realistic pathways for Na movement, including blood-tissue recycling.
Application of the updated model to calculate dose coefficients for 22Na and 24Na.

Main Results:

The updated model provides a more realistic depiction of sodium (Na) biokinetics, including recycling between blood and tissues.
Dose coefficients derived from the updated model are comparable to previous ICRP models, with notable exceptions.
A roughly twofold increase in dose coefficients for endosteal bone surface was observed due to updated assumptions about exchangeable sodium.

Conclusions:

The updated sodium (Na) biokinetic model offers a more refined approach to internal dosimetry for radioactive sodium.
The model's structure supports broader applications, including pediatric and gestational dosimetry.
Enhanced accuracy in dose assessment is achieved, particularly for bone surface dosimetry.