Measurement of a 103Pd solution using the TDCR method by LSC

Area of Science:

• Nuclear physics
• Medical physics
• Radiochemistry

Background:

• Palladium-103 (Pd-103) is a radionuclide utilized in brachytherapy for prostate cancer treatment.
• Pd-103 decays via electron capture to excited states of Rhodium-103 (Rh-103).
• Accurate detection efficiency is crucial for medical applications and dosimetry.

Purpose of the Study:

• To describe a calculation method for determining the detection efficiency of Pd-103.
• To analyze energy transfer within a scintillator following electron capture and conversion.
• To evaluate uncertainties using the Monte Carlo method.

Main Methods:

• Utilized the triple to double coincidence ratio (TDCR) model for efficiency calculations.
• Considered atomic events (electron capture, conversion) for energy transfer.
• Employed the PENELOPE code for stochastic simulation of X-ray absorption.
• Applied Monte Carlo methods for uncertainty and covariance matrix evaluation.

Main Results:

• A detailed method for calculating Pd-103 detection efficiency was established.
• The study identified main contributors to uncertainty in the calculations.
• Covariance matrix analysis was performed to understand error propagation.
• The PENELOPE code was used to simulate energy deposition in scintillators.

Conclusions:

• The developed calculation method provides a framework for accurate Pd-103 detection efficiency.
• Understanding energy transfer and atomic events is key to precise dosimetry.
• Monte Carlo simulations are essential for evaluating uncertainties in complex decay schemes.