[In vivo dosimetry in interstitial "low dose rate" afterloading therapy with Ir-192 seeds exemplified with head-neck tumors].

An in vivo measuring method is introduced from mending the calculated lying time of implants corresponding to the given dose (reference dose) in the interstitial brachytherapy with iridium-192 seeds. The small effort for using this method and the relatively easy way of handling it allow its clinical use for quality assurance in brachytherapy.