Freiberg
Instruments
GmbH
ּ Am St. Niclas Schacht 13 ּ 09599 Freiberg – Germany
72 / 78
5
Source leakage test
For source leakage testing the manufacturer recommends a wipe test per ISO 9978. The
source manufacturer recommends the wipe to be taken directly on the radiation window of
the source (see fig. 9) as well as on the accessible surfaces of the shutter. Note that the
source must not be removed from the radiation source module.
It is recommended to perform the leakage annually. Note that local policy may require
another leakage test interval.
Im
portant: It’s the user’s responsibility to have the leakage test conducted.
The leakage test is to be conducted as follows:
-
Verify shutter is closed. Perform radiation survey.
-
Remove radiation source module from
lexsyg
base plate.
-
Note that the shutter
doesn’t shield beta radiation completely. Use appropriate
radiation safety measures (acrylic glass shield, 4 mm aluminium transport safety plate
for intermediate storage of the source module).
-
Open shutter by hydraulic (or mechanical) means. Verify the shutter opens and
closes smoothly.
-
Inspect radiation source window for mechanical damage. Verify correct source
position in source holder.
-
Perform wipe test on surfaces as shown in fig. 9. Ensure the radiation window is not
damaged. The radiation source MUST NOT be removed from the source holder.
-
Close shutter.
-
Reinstall radiation source module on the base plate of the
lexsyg
.
Radiation hazard!
Dose rate at 20 cm distance from unshielded source is about 200 mSv/h, i.e. 50 µSv/sec.
Use appropriate means of radiation protection.
