VariSource iX, Software Version 1.1, Part Number AL20020000 VariSource iX Afterloader. || The VariSource iX Series High Dose Rate Afterloader system is a computer controlled remote electra/mechanical system used for medical purposes, for placing a NiTiNol wire incorporating an irradiated iridium seed internally or close by, a malignant tumor or tumor bed in a practice known as brachytherapy. The device has up to 20 channels for treatment.