34
Intended use
34.1
General information
35
Exercise caution during operation of the alpha sensor. Carefully protect it from
bumps and drops.
36
Operate the alpha sensor with caution to avoid damage to the light protection
film; otherwise it results in alpha sensor’s malfunction. Damaged films can be replaced by
User according to instructions in Appendix A.
37
Take care not to contaminate the alpha sensor by radioactive material during
use. It is possible to check the alpha sensor for radioactive contamination in the following
sequence:
−
Remove the protective plate and put the alpha
sensor on a clean sheet of paper
−
Absence of audio and visual alarm is the
indication of no contamination of alpha sensor. If an alarm
has been activated, then it is necessary to perform alpha
sensor’s deactivation as described in 42.
37.1
Standard use
37.1.1
Quick assessment of surface contamination by alpha-emitting radionuclides is
the representative means of assessing dangers from surfaces contaminated by radioactive
materials as a source of subsequent internal irradiation.
37.1.2
Surface contamination by alpha-emitting radionuclides can be assessed in
places of work with open sources of ionizing radiation as well as in premises with a
possibility of contamination by transportation of radioactive substances on various objects
(tools, overalls and shoes) or by flowing air. Select the place for assessment of surface
contamination by alpha-active radionuclides based on the analysis of previous data on
premise contamination and information on potential transfer of radioactive substances to
these premises.
37.1.3
Perform assessment of surface contamination by alpha-active radionuclides in
the following sequence:
−
Remove the protection plate from alpha sensor
−
Put the alpha sensor on the surface which is
assumed to be contaminated by radioactive material
−
Wait about 5 s. Absence of audio and visual
alarm is the indication of no contamination.
−
Move the alpha sensor to the next point.