38
Maintenance
39
Maintenance is necessary to keep the alpha sensor ready for operation and to
ensure fail-safe performance throughout its life.
40
Maintenance consists in preventive activities performed at least monthly.
41
Preventative activities include the following:
−
External check
−
Check the contents of alpha sensor’s delivery set according
to 19.1.
−
Remove dust and impurities from external surfaces of alpha
sensor and accessories, wipe with decontaminating
solution.
42
In case of radioactive contamination of alpha sensor the decontamination is
required. Do this by replacing the alpha sensor’s light protection film by a new one, wipe
the alpha sensor’s housing thoroughly with a cloth soaked in decontaminating solution
(synthetic cleaning agent), then with a cloth soaked in warm water, and then wipe dry.
43
If integrity if light protection films are at doubt, then perform the light
protection check. Remove the protection plate from alpha sensor, position the entrance
window at the distance of 40
−
50 cm from a 40-Watt incandescent lamp and power on the
lamp. The light protection film is damaged if the alpha sensor generates an alarm.
The alpha sensor’s light protection is considered to be sufficient, if there is no alarm
in the presence of additional light source.
If the light protection film is damaged, self-replace it according to instructions in
Appendix A.