The extent of this drop is dependent on the electrode distance, the applied chamber voltage and thus the field strength in the sensitive air volume. The ion collection efficiency of the investigated ionization chambers drops significantly in the ultra-high DPP range. The method has been extended to obtain time-resolved and position-dependent electric field distortions within the air cavity. was implemented taking into account space charge effects at these ultra-high DPPs. Additionally, the numerical approach introduced by Gotz et al. All measurements were performed in a 24 MeV electron beam with DPP values between 0.01 and 3 Gy. The latter was achieved by calibrating a current transformer against alanine dosimeters. ![]() Their ion collection efficiencies were determined experimentally using two methods: extrapolation of Jaffé plots and comparison against a DPP-independent reference detector. ![]() MethodsĪn advanced Markus chamber and three specially designed parallel plate air-filled ionization chambers (EWC: End Window Chamber) with varying electrode distance of 0.5, 1, and 2 mm have been investigated. ![]() The role of the chamber design and the electric field strength in the sensitive air volume have been evaluated. The ion collection efficiency of vented ionization chambers has been investigated in an ultra-high dose-per-pulse (DPP) electron beam.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |