Fiorino C, Cattaneo G M, del Vecchio A, Fusca M, Longobardi B, Signorotto P, Calandrino R
Servizio di Fisica Sanitaria, Istituto Scientifico-Ospedale San Raffaele, Milano, Italy.
Med Dosim. 1994 Summer;19(2):73-4. doi: 10.1016/0958-3947(94)90074-4.
The interaction between photon or electron fields and cables of ionization chambers induces the flow of leakage currents affecting the measured signal; this "cable effect" is particularly important when large electron and photon fields are used, i.e., when large portions of cable are irradiated. Therefore it is more interesting to investigate cable-induced effects when ionization chambers are used for clinical situations where large fields are used, for example, total body and total skin electron irradiations (TSEI). In TSEI fields these effects are particularly important. Cable and connector effects using an NE2534 Markus chamber in total skin irradiation conditions with different electron energies (from 1.6 to 4.5 MeV) have been investigated. These effects are significant and show that for TSI dosimetry it is vital to take them into account.
光子或电子场与电离室电缆之间的相互作用会引发漏电流，影响测量信号；当使用大尺寸电子和光子场时，即当电缆的大部分被照射时，这种“电缆效应”尤为重要。因此，在电离室用于诸如全身和全身皮肤电子照射（TSEI）等使用大尺寸射野的临床情况时，研究电缆引发的效应更具意义。在TSEI射野中，这些效应尤为重要。已研究了在不同电子能量（1.6至4.5 MeV）的全身皮肤照射条件下，使用NE2534 Markus电离室时的电缆和连接器效应。这些效应很显著，表明对于TSI剂量测定而言，考虑这些效应至关重要。
