Testing results of a new extremity dosimeter designed to meet PTB requirements

Abstract

This paper describes the design and testing results of a new thin extremity ring dosimeter designed to meet the requirements of the Physikalisch Technische Bundesanstalt (PTB). The ring cap was designed with a thin 3.3 mg cm - 2 entrance window and a concave ring cap to optimize the dosimeter angular response. A thin 7 mg cm - 2 monolayer of Harshaw TLD-700H ( 7LiF:Mg,Cu,P) powder was incorporated in the active element design to accommodate a wide beta energy range. The tissue equivalence of the TL phosphor helps maintain a relatively flat energy response. Energy response for both photons and betas are presented. In addition, lower limit of detection, residual signal, and re-use results are discussed.