Measurements of the dosimetric constants for a new 103Pd brachytherapy source

Abstract

Purpose: This report provides dosimetry information for a new brachytherapy 103Pd source (Model 2335) manufactured by Best Medical International and, through comparisons with data from another published report for the same source, presents a suggested hybrid dataset for clinical applications. Methods and Materials: Dose measurements were made using thermoluminescent dosimeters (TLD), with the 103Pd source in the center of a Virtual Water phantom on a rotating insert, allowing for a number of different possible angles, and 12 TLD cubes (1.0 × 1.0 × 1.0 mm) and 16 TLD rods (1.0 × 1.0 × 3.0 mm) arranged in an outward spiral pattern at distances ranging from 0.5 to 5.0 cm. All measurements are based on the 2000 correction of the National Institute of Standards and Technology 1999 standard. Results: From these measurements, tables are presented for the radial dose function and the anisotropy function. The dose rate constant = 0.71 ± 0.07 cGy h −1 U −1 and the anisotropy constant = 0.96 ± 0.03. Conclusions: The dose rate constant for the hybrid = 0.70 and the anisotropy constant for the hybrid = 0.92, Hybrid tables are presented.