This International Standard is applicable to equipment used for sampling and continuous
measurement of radioactive noble gases in the workplace,in gaseous effluents discharged
into the environment as well as in the environment itself.Monitoring by definition is the
process of continuous and real-time measurement.The processes of sampling or taking
samples for retrospective laboratory analysis are included in this standard.
The object of this standard is to establish mandatory general requirements and to present
examples of acceptable methods and equipment for sampling and monitoring radioactive
noble gases.Current standard IEC 60761-3 which is complemented by this standard,is
applicable to installing portable and transportable equipment for sampling and monitoring
radioactive noble gases,ONLY IN GASEOUS EFFLUENTS,while this standard expands
coverage to include monitoring all possible locations where radioactive noble gases could
present a radiological hazard.The equipment is designed to be operational during normal
operation conditions as well as under emergency conditions,both during and following an
accident.Depending on the nature of the emergency conditions it may be necessary to install
specially designed equipment for normal operational conditions and other equipment for
emergency conditions.
This standard is applicable to radioactive noble gas samplers and monitors intended to
provide the following functions:
—·The measurement of the volumetric activity of radioactive noble gases and their variation
with time in the workplace,in gaseous effluents at the discharge point and in the
environment.
一The measurements performed during normal operational conditions as well as under
emergency conditions during and after an accidental release.
一The actuation of an alarm when a predetermined volumetric activity,or concentration,or a
predetermined total of released radioactivity is exceeded.
—-The determination of the total gaseous activity discharged over a given time and/or to
provide information on the composition of a mixture of different gases released
—The sampling and retrospective analysis of air or gas containing noble gas.
Radon,with isotopes 219Rn,220Rn,and 222Rn,is a naturally occurring radioactive noble gas
whose measurements are NOT considered in this standard.The presence of radon and its
progeny may sig n ificantly interfere with the proper measurement of the noble gases of
concern in this standard.
This standard specifies the general characteristics,general testing procedures,mechanical,
electrical and electronic,radiological,safety and environmental characteristics,and the
proper identification and certification of the equipment.If this equipment is part of a
centralized system for continuous radiation monitoring in a nuclear facility,there may be
additional requirements from other standards related to those systems.