Rod source shields LB 8300
6 Maintenance and Repair
64217BA2 Rev. 00, 10/2017
33
6.4
Checking the locking mechanism
The functional test of the locking mechanism must be carried out by a person
who is at least an employee with general knowledge. We recommend conducting
the test of the locking mechanism at the same intervals as the visual inspection if
the operating condition of the system allows.
1.
Ensure that no employees are present in the direction of the radiation beam
outlet. Otherwise, these persons will be exposed to the radiation beam when
the locking mechanism is opened.
2.
Open and close the locking mechanisms several times (see chapter 5) while
observing the measuring signal of the corresponding measurement system.
The locking mechanism works properly if the measured value approximately
corresponds to the maximum value when the locking mechanism is closed
(CLOSED position).
Tip
Alternatively, you can measure the dose rate in the beam path. In this case,
the dose rate in the CLOSED position must be clearly lower than in the OPEN
position. At the same time, the dose rate in the CLOSED position may not be
significantly higher than at other parts of the shield.
3.
Return the locking cylinder to its starting position (OPEN position or CLOSED
position).
4.
If applicable, reinstall the fixing screws and/or the padlock.
5.
Immediately report any malfunction or stiffness of the locking mechanism to
the competent radiation safety officer.
