EN 61098:2007 – Radiation protection instrumentation – Installed personnel surface contamination monitoring assemblies
4 Classification of assemblies
Assemblies are classified as follows.
4.1 According to type of radiation to be measured
− } Alpha contamination monitors and warning assemblies.
− Beta contamination monitors and warning assemblies.
− Gamma only contamination monitors and warning assemblies.
− Alpha-Beta contamination monitors and warning assemblies (where the alpha and beta contaminations are indicated separately).
− Beta-Gamma contamination monitors and warning assemblies (where the beta and gamma contaminations are indicated separately).
− Alpha-Beta-Gamma contamination monitors and warning assemblies (where the alpha, bet and gamma contaminations are indicated separetely).~
4.2 According to type of surface
− } Assemblies for the monitoring of the whole body (including the head).
− Assemblies for the monitoring of hands only.
− Assemblies for the monitoring of feet only.
− Assemblies for the monitoring of both hands and feet.~
4.3 According to type
− Assemblies with ambient background subtraction.
− Assemblies without ambient background subtraction.
− Assemblies where in order to provide an improved detection capability for both beta and gamma emissions there are, in addition to beta detectors, gamma only detectors. These assemblies include background subtraction.
− Assemblies where in order to provide improved detection capability for both beta and gamma emissions there are, in addition to beta detectors, gamma only detectors. These assemblies do not include background subtraction.
} 4.Z1 Compressed overall classification
The equipment may also be supported with a compressed overall classification based on the intended field of use, as shown in Table Z1 below.~
5 Design characteristics
5.1 Positioning of user Sensors shall be included for alpha and beta monitoring to ensure that the feet, hands and body of the person being monitored are correctly positioned. The hands must be open so that the palms and both sides of the fingers are properly monitored. Such sensors shall indicate to the user that he has positioned himself correctly and remains in the correct position for the full monitoring period. Both audible and visual indication shall be given if the user moves from the correct position and the monitoring procedure shall cease until the correct position is regained. The monitoring time may either be the total time the user is in the correct monitoring positions and monitoring is taking place or a single continuous monitoring time, in the latter case the information collected prior to the user moving shall be ignored.
EN 61098:2007 – Radiation protection instrumentation – Installed personnel surface contamination monitoring assemblies