Proton induced radiation damage studies on plastic scintillators for the Tile calorimeter of the atlas detector

5.2.2.
 
Comparison of light transmission loss 
The following six plots show the relative transmission of each scintillator type 
for the various doses, 4 weeks after irradiation.
Figure 5-3: Relative transmission spectra at several dose for the different scintillator 
types, taken four weeks after irradiation.

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40 
The relative transmission is computed by taking the ratio between the 
transmissions in irradiated to un-irradiated samples. The spectra are multiplied 
by a correction factor computed as the ratio of the spectra of a control sample 
taken on the two respective days of testing. The development of an absorptive 
tint shifting to higher wavelengths as dose exposure is increased can be more 
clearly observed in these plots. 
To compare the effect of transmission loss as a function of dose wi thin the various 
samples, the loss at a wavelength of 430 nm is considered. This corresponds to 
the peak absorption wavelength of the fiber; Kuraray Y -11(200) [28]; that these 
scintillators are coupled to within the Tile Calorimeter and would give an 
indication into the performance of the scintillators as part of the coupled system. 
The relative transmission at 430 nm for the various samples 4 weeks after 
irradiation are shown in Figure 5-4 below.
Figure 5-4: Relative transmission at 430 nm for the various sample types measured 4
weeks after irradiation.
Transmission loss at 430 nm
Dose (Gy)
1e+6
1e+7
1e+8
Re
lati
ve
 Trans
missio
n
 (
a.u)
0,0
0,2
0,4
0,6
0,8
1,0
1,2
EJ200 
EJ208 
EJ260