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nMEST EN ISO 16526-2:2021

Non-destructive testing — Measurement and evaluation of the X-ray tube voltage — Part 2: Constancy check by the thick filter method

General information

40.20     Mar 5, 2021


Stručni savjet za standarde

European Norm



ISO 16526-2:2011 specifies a constancy check of a X-ray system where mainly the X-ray voltage is checked and also the tube current and the constitution of the target which can be changing due to ageing of the tube.
The thick filter method is based on a measurement of the dose rate behind a defined thick filter using defined distances between the X-ray tube, the filter and the measuring device.
This method is very sensitive to changes of the voltage, but it does not provide an absolute value for the X-ray tube voltage. Therefore, a reference value is needed and, it is recommended to find this reference, for example, within the acceptance test of the system.
The thick filter method is a rather simple technique and may be applied by the operator of an X-ray system to perform regularly a constancy check of the system.
The method can also be applied for consistency checks after changing components which may affect the X-ray tube voltage.
This method can be applied for all types of X-ray systems, i. e. for constant potential, half wave and impulse wave generators with a tube current larger than 1 mA.

Life cycle


MEST EN 12544-2:2019


nMEST EN ISO 16526-2:2021
40.20 DIS ballot initiated: 12 weeks
Mar 5, 2021

Related project

Adopted from EN ISO 16526-2:2020

Adopted from ISO 16526-2:2011

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