1.1 This standard is applicable to radiation meters and monitors designed to measure or detect
surface contamination by alpha and/or beta radiation emitting nuclides and which comprise at least:
- a detection sub-assembly (comprising counter tube, scintillation detector, semiconductor detector, etc.), which may be connected either rigidly or by means of-a flexible cable or incorporated into a single assembly with
- a measuring sub-assembly.
Radiation meters and monitors are defined in Amendment No. 1 to IEC Publication 181: Index of Electrical Measuring Apparatus Used in Connection with Ionizing Radiation, as follows:
Radiation meter
An assembly including one or several radiation detectors and associated sub-assemblies or basic function units and designed to measure quantities connected with ionizing radiation (activity, exposure rate, etc.).
(Radiation) monitor
A radiation meter provided with means for giving perceptible warning (generally optical or acoustical) that the quantity connected with ionizing radiation exceeds some adjustable predetermined value or that the measured value is not within some adjustable predetermined limits.
1.2 The standard is applicable in its entirety to:
alpha surface contamination meters;
- alpha surface contamination monitors:
- beta surface contamination meters;
- beta surface contamination monitors; as defined below:
Alpha (beta, alpha-beta) surface contamination meter
An assembly including one or more radiation detectors and associated sub-assemblies or basic function units and designed to measure alpha (beta, alpha-beta) activity per unit surface area associated with the contamination of the surface under examination.
Alpha (beta, alpha-beta) surface contamination monitor
Alpha (beta, alpha-beta) activity meter provided with means for giving perceptible warning (generally visual or audible) that the indicated activity per unit surface area associated with the contamination of the surface under examination exceeds some adjustable predetermined value or that the measured value is not within some adjustable predetermined limits.
1.3 The standard is also applicable to special-purpose assemblies and to assemblies specifically
designed for a surface of a particular nature (e.g. laundry, floors). However, some of the requirements may need to be amended or supplemented according to the particular requirements applicable to such assemblies.
1.4 If an assembly has been designed to carry out combined functions, it shall comply with the requirements pertaining to these different functions.'If, on the other hand, it has been designed to perform one function, and, in addition, it is also capable of carrying out other functions, then it shall comply with the requirements for the first function, and it would be desirable for it to comply with requirements pertaining to the others.
IS 11866-1987 history
1988IS 11866-1987 Specification for alpha, beta and alpha-beta pollution meters and monitors