Constancy checks of well-type ionization chambers with external-beam radiation units.

Constancy checks of a well-type ionization chamber should be performed regularly as part of a quality assurance regime. The goal of this work was to test the feasibility of using a linear accelerator and an orthovoltage unit to check the constancy of a well-type chamber's response to an external radiation source. The reproducibility, linearity with dose, variation with dose-rate, and variation between energy-matched units of the well-type chamber response when exposed to 6 MV beams was examined.

Survival and Toxicity Following Chemoradiation for Carcinoma of the Cervix - Impact of Multiple-phase Treatment and Shielding.

Aim: We report on outcomes and significant grade 3-4 late toxicities between January 1999 and October 2006 following introduction of multi-phase treatment and effect of shielding in treatment of cervical cancer with concurrent chemoradiation.

Patients And Methods: Radiotherapy dose by phase, recurrence, survival and toxicity data was collated by a retrospective review of clinical notes. Shielding information was retrieved from original planning films.