Freiberg
Instruments
GmbH
ּ Am St. Niclas Schacht 13 ּ 09599 Freiberg – Germany
62 / 78
sample holder
120
1 m distance to housing surface of
lexsyg
0,8
In the present case, the radiation source module was completely sealed against beta
radiation. Hence, the equivalent dose rate measured was solely caused by photon
(bremsstrahlung) radiation created within the source body, the shutter and the source
module housing. It made no difference whether the source shutter was opened or closed.
Note that the source shutter doesn’t completely shield all of the beta radiation emitted by the
radiations source. It is anticipated that actual dose rates may exceed those given in table 2
by more than 10 times under certain circumstances such as:
-
Wipe test conducted at source shutter
-
Cleaning of the measuring chamber or the sample carrier of the
lexsyg
-
Handling of the radiation source module during installation, wipe test and handling
emergency situations
2.2
Occupational exposure during use of the
lexsyg
Occupational exposures of the user associated with typical activities during operating and
maintaining the
lexsyg
are determined below:
2.2.1 User activities at the control panel of the
lexsyg
Process steps
Loading of sample carousel, keyboard input (measuring
sequences, test runs, etc.)
duration
15 min
Typical distance to source
70 cm (eyes, body)
30 cm (hands)
Dose per handling
0.5 µSv (eyes, body)
0.7 µSv (hands)
Number of annual activities
100
notes
Source shutter typically closed (may be opened for a
short period of time), minimized occupancy time of the
