Retractable Tape Measure Tray, for Varian Type III (with MLC), with Optical Coding

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Retractable Tape Measure Tray, for Varian Type III (with MLC), with Optical Coding.

The 3 meter Retractable Tape Measure Tray is used to measure the distance between the source of radiation and the point of interest on a patient.  It is very useful in extended field dosimetry, enabling one to obtain an accurate measurement of source to skin distance.  It can also be used for setting source to phantom distances for calibration and experimentation.

This measuring device is mounted on a lexan (polycarbonate) tray which slides into the block tray slot.  Attached to the center of the tray is a 3 meter tape measure. The tape measure has an adjustable stainless steel end.  This can be positioned at any point along the tape, allowing the tape to be cut at the desired length to compensate for the source to tape measure distance.