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Value driven tolerance limits – RP162
Criteria for Acceptability of Medical Radiological Equipment used in Diagnostic Radiology, Nuclear Medicine
and Radiotherapy. RP 162 (European Commission), 2013
R
ADIOTHERAPY
Physical Parameter
Suspension
Level
Reference
(IEC (2007,
2008c)
clause
numbers
unless
stated)
Type
Symmetry of electron fields (max/min
ratio)
>1.05
A
Maximum ratio of absorbed dose
(max/min ratio)
1.09 See IEC
A
Dose monitoring system
7
Weekly calibration check
>2 %
A
Reproducibility
>0.5 %
A
Proportionality
>2 %
A
Dependence on angular position of gantry and
beam limiting device
>3 %
A
Dependence on gantry rotation
>2 % - electron
radiation
>3 % - X-radiation
A
Stability throughout the day
>2 %
A
Stability in moving beam radiotherapy
See IEC
A
Depth dose characteristics
8
X-radiation
Penetrative quality
>3 % or 3 mm.
A
Depth dose and profiles
>2 %
IPEM (1999) B