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6. Application
The dosimeter has been designed to perform measurements in the field of electron beam
engineering. Nowadays, procedures in electron beam engineering are tested and implemented
at an acceleration voltage of 50 keV up to the MeV range. At low acceleration voltages, it is
important to measure not only the exact dose, but also the depth dose. This is only possible if
the measuring film used is thin enough to enable the resolution in the layer thickness subjected
to irradiation.
6.1
Depth dose measurement
In the case of most depth dose measurements, you simply need to superimpose layers of
measuring film and then perform the evaluation. This results in a 20 g/m
2
grid.
Our thin measuring film (just 20 g/m
2
) provides this resolution with a measuring system which is
easy to use.
For accurate depth dose measurements, we recommend that you layer thin polyester film
sheets (10 µm equal to 10 g/m
2
) in individual stacks on the dosimeter film during irradiation.
This method compensates for variations in the thickness (+/- 2 – 3 µm) of the dosimeter
measuring film and yields improved resolution. A resolution of 10 g/m
2
is achieved with a
correspondingly accurate dose at the end of the stack, via the measuring film of 20 g/m
2
. At 20
g/m
2
, dose loss is minimal, thus reducing the incidence of measurement errors.
Typical depth dose with a resolution of 20 g/m
2
:
6.2 Measurements
across the effective width
The dosing accuracy across the effective width can be evaluated by attaching a measuring strip
across the effective width, e. g. at cm intervals.
6.3
Measurements in the conveying direction
In the case of EBC–units, which switch from roll to roll and use the track speed to control the
beam of electrons (dose control), you can control the dosing accuracy when starting or stopping
the unit simply by attaching a measuring strip in the track direction - e.g. 3 – 5 m measuring film
- (control setting).
D o s e p e n e t r a t io n c u r v e f o r 1 5 0 k V
0 ,0
1 0 ,0
2 0 ,0
3 0 ,0
4 0 ,0
5 0 ,0
6 0 ,0
7 0 ,0
8 0 ,0
9 0 ,0
1 0 0 ,0
1 1 0 ,0
0
2 0
4 0
6 0
8 0
1 0 0
1 2 0
1 4 0
1 6 0
1 8 0
2 0 0
2 2 0
2 4 0
2 6 0
2 8 0
3 0 0
M a s s p e r u n it a r e a g /m 2
% I
oni
za
ti
on
