Endress+Hauser FQG60, Technical Information & Operating Instructions

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Source container FQG60
Hauser 7
Function and system design
Function Function of the radiation source container
In the FQG60 source container, the radioactive source is surrounded by a steel casing filled with lead
which screens off gamma radiation. The radiation is emitted, almost unattenuated, in one direction
only through a channel (focusing emission channel). This beam is used for the radiometric
measurement.
Switching the radiation on and off
• The current switch position (ON or OFF) is clearly indicated on the exterior of the radiation source
container.
• The OFF position is secured by a padlock.
• The ON position is secured by a padlock or a snap hook
(depending on the version; see the product structure 
ä
28).
Attenuation factor and half-
value layers
In the direction of the beam
• Attenuation factor F
S
: 11
• Number of the half-value-layers: 3.5
In the direction opposite to the beam
• Alternation factor F
S
: 22
• Number of the half-value-layers: 4.5
NOTICE
These are typical values, which do not take into account production-dependent fluctuations of
the source activity and tolerances of the measuring devices.
Maximum activity of the
radiation source
137
Cs - 1.11 GBq (30 mCi)
CAUTION
!
The maximum admissible activity may be further restricted by country-specific regulations or
approvals.
Dose rate diagrams A dose rate diagram specifies the local dose rate in a specified distance from the surface of the
radiation source container. Below you find examples of dose rate diagrams for FQG60. They are valid
for a distance of 1 m (3.3 ft) and for selected activities of a
137
Cs radiation source, and refer to the
radiation being switched OFF. Dose rate diagrams for other distances and activities are available on
request. The dose rate diagram for the real charging can be ordered in Feature 580 "Test, Certificate".
Allocation to the option, see the Product Configurator on the Hauser website:
www.endress.com → Select your country → Products → Select measuring technology, software or
components → Select the product (picklist: measurement method, product family etc.) → Device
support (right column): Con fi gure the selected product → The Product Con fi gurator for the
selected product opens