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Authors' reply—Perfomance of a commercially available field flatness device

Regional Medical Physics Department, South Cleveland Hospital, Marton Road Middlesbrough, Cleveland TS4 3BW, UK

This excerpt was created in the absence of an abstract.

Hermes, a commercially available field flatness device (manufactured by Precitron AB, UK agents Graytech Ltd), has been used to measure the value of field flatness of radiotherpay treatment fields including -rays (cobalt 60), X rays (55 kV to 8 MV) and electrons (5 MeV to 14 MeV). A secular variation has been observed over a period of 12 months use. It is postulated that this may be partly attributable to radiation damage.

The device contains 10 P type semiconductor diode detectors, nine of which are strategically placed for the measurement of field flatness and one for measurement of depth dose.

Received for publication January 1, 1991.