Freiberg
Instruments
GmbH
ּ Am St. Niclas Schacht 13 ּ 09599 Freiberg – Germany
68 / 78
2.2.7 Lab user (without operating the
lexsyg
)
Process steps
Laboratory work
Minimum distance to source
200 cm
Dose rate
< 1 µSv/h
Annual dose
< 1 mSv
notes
Normal laboratory work without operating the
lexsyg
Mean annual occupancy time at given distance is
estimated not to exceed 200 hrs
2.2.8 Emergency
situation: Shutter wouldn’t close correctly and needs to be checked
and manually adjusted
Process steps
1. Opening of the
lexsyg
housing
2. Disassembling of the external optical system
mounted on top of the radiation source module
3. Removing the lead shield of the radiation source
module
4. Installation of a radiation protection shield
(10 mm acrylic glass)
5. Visual inspection of the radiation source module
and the shutter
6. Repair and adjustment of components
7. Reassemble system in reverse order
8. Test run
duration
15 min
Typical distance to source
30 cm (eyes, body)
5 cm (hands)
Dose per handling
15 µSv (eyes, body)
140 µSv (hands)
Number of annual activities
1
notes
Shutter assumed to not fully closed
Upon removing the radiation source module from
