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Behavior with Empty Vessel
After you have correctly mounted the source holder, make sure the control area
around the empty vessel is measured for radioactivity. If any radioactivity exists,
cordon of the area and mark the area with warning signs.
Reliably close off any accessible ways of access to the
inside of the vessel and
mark them with a
warning sign "Radioactive".
The
responsible
radiation
safety
officer
can
allow
access
after
having
checked the
safety measures with the shutter closed on the source holder. If you must work in
and on the vessel, it is absolutely necessary to close the shutter on the source holder
.
Location
At the time you ordered your equipment, VEGA sized the source holder for
optimal performance for the designated application. If the location of the
equipment has changed or is different from the original order, notify VEGA
before installing the equipment.
External Obstructions
Any material in the path of the radiation can affect the measurement. Some
materials that are present during the initial adjustment pose no problem because
the adjustment accounts for the effect of those materials. Examples of such
materials are:
• Tank walls
• Liners
• Insulation
However, when the materials change or you introduce new ones, an erroneous
gauge reading is possible. For example, insulation that you add after adjustment
absorbs the radiation and causes the gauge to erroneously read upscale.
Locate the source holder where process material cannot coat it.
Appropriate location ensures the continuing proper operation of
the source shutter, if applicable. Many regulatory agencies, such
as the U.S. Nuclear Regulatory Commission (NRC), require
periodic testing of the shutter. See the Radiation Safety Manual
for details about current regulations.
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