1.1 Scope
This International Standard specifies the performance requirements of
radiotherapy dosimeters, intended for the
measurement of absorbed dose to water or air
kerma (and their rates and spatial distributions) in
photon, electron, proton or heavy ion radiation
fields as used in radiotherapy.
The dose monitoring systems incorporated in radiotherapy
treatment machines are not covered by this standard, neither are the
re-entrant ionization chambers used for
brachytherapy source calibration and constancy check devices.
This standard is applicable to the following types of
dosimeter:
-
a)
field-class
dosimeters
normally used for
-
1) the measurement of kerma or dose in a radiation
beam, either in air or in a phantom;
-
2) in vivo skin surface or intracavitary measurements of dose on
patients.
-
b)
reference-class
dosimeters
normally used for the
calibration of field-class dosimeters;
NOTE Reference-class dosimeters may be used as field-class
dosimeters.
-
c)
scanning-class
dosimeters
normally used for relative dose
distribution measurements with a scanning system
such as an automatic water phantom.