For which type of source was the Paris system developed?

The Paris system was developed specifically for the planning and treatment of temporary implants utilizing iridium-192 (192Ir) wire. This system is crucial in brachytherapy, where precise placement of the radioactive source within or near a tumor is necessary for effective treatment.

The Paris system provides a standardized method for calculating the dose distribution from sources like 192Ir, aiding clinicians in determining the correct positioning and activity of the source to maximize therapeutic effects while minimizing exposure to surrounding healthy tissue. It takes into account factors such as source geometry and use of specific dosimetric parameters, making it particularly suited to temporary applications where precise dosimetry is paramount due to the nature of the treatment.

This choice reflects a deeper understanding of brachytherapy techniques and the need for accurate dose calculations, especially in temporary implants where the source is removed after a specified treatment period. The other types of sources mentioned do not align with the development goals and applications of the Paris system.