Abstract
The combined use of film and thermoluminescent dosemeters tied to National Bureau of Standards calibrated ionization chambers gives the physicist enough instrumentation to check for himself machine performance, effects of various collimating devices and individual patient variations. Rapid process mammography film together with automatic processing was found to give reproducible results. Refinement of the data was made less time consuming by utilizing an automated film density plotter. TLD was utilized both in phantom studies and during patient treatment to give corroborative results to the film dosimetry. The ease with which visible dosimetric results of a particular treatment situation can be shown has made these techniques a valuable teaching tool. Examples were given of: (a) variations discernible with different therapy units in terms of field flatness, effects of trimmer bars, effects of special collimating devices; (b) dosimetric variations across a treated volume in treatment of a tongue lesion, mantle field; and (c) rotational effects.
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