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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

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Evaluation of 225Ac decay data.

Huang Xiaolong¹, Wang Baosong

¹China Institute of Atomic Energy, China Nuclear Data Center, P.O. Box 275(41), Beijing 102413, China. huang@ciae.ac.cn

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

|March 27, 2007

Summary

This study presents an updated decay scheme for Actinium-225 ((225)Ac), refining its half-life to 10.0±0.1 days and key gamma-ray emission probabilities for accurate nuclear data.

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Area of Science:

Nuclear Physics
Radiochemistry
Atomic and Molecular Physics

Background:

Actinium-225 ((225)Ac) is a medically relevant radioisotope with applications in targeted alpha therapy.
Accurate decay data are crucial for dosimetry and treatment planning in nuclear medicine.

Purpose of the Study:

To evaluate and present a complete decay scheme for (225)Ac.
To incorporate new measurements and existing literature data up to March 2006.
To provide updated decay characteristics for improved applications.

Main Methods:

Comprehensive evaluation of literature data for (225)Ac decay.
Inclusion of new experimental measurements.
Calculation of internal conversion coefficients and decay intensity balance.
Utilized the Evaluated Nuclear Structure Data File (ENSDF) analysis program.

Main Results:

Determined a refined half-life for (225)Ac of 10.0±0.1 days.
Recommended a gamma-ray emission probability of 0.693±0.012% for the 150.04 keV line.
Presented a complete decay intensity balance based on calculated internal conversion coefficients.
Established a new, comprehensive decay scheme for (225)Ac.

Conclusions:

The updated decay scheme and data for (225)Ac provide a more accurate foundation for its use in medical applications.
The refined half-life and gamma-ray probabilities enhance the reliability of radiation dose calculations.
This work consolidates existing knowledge and introduces new findings for (225)Ac decay characteristics.