11
2 Product description
SHLD1 • Source holder
62092-EN-190704
The radioactive source in the source container emits gamma rays.
The SHLD1 is mounted on the vessel, the pipeline or on a conveyor
belt/spiral conveyor directly opposite the sensor.
The source holder shields the environment against gamma radia-
tion and protects the radioactive source from mechanical damage or
chemical influences. In case of large measuring ranges (e.g. with high
vessels) two or more source holders are used.
The SHLD1 consists of the components:
1
2
3
4
Fig. 5: Source holder SHLD1
1 Source holder
2 Switchover/locking mechanism
3 Transport lug
4 Mounting surface
The rays emitted by the gamma source are damped when penetrat-
ing the medium. The sensor detecting the attenuated radiation on the
opposite side of the vessel calculates the measured value from the
intensity of the radiation.
Max. activity of the sources
The following table states the max. activity of the sources. Production-
related fluctuations of the radiation activity and tolerances of the
measuring instruments are not taken into account.
Cs-137
Max. activity
max. 3.7 GBq (100 mCi)
Tab. 1: Max. activity of the sources
Caution:
The max. permissible activity of the source can be further limited by a
country-specific approval.
Functional principle
Source
