Development of novel plastic scintillators based on polyvinyltoluene for the hybrid j-pet/mr tomograph

Table 10 Temperatures of structural changes determined for J-PET scintillator and pure matrix determined by 
PALS.
Sample 
T
γ 
[K] 
T
γ 
[ºC] 
T
g
 [K] 
T
g
[ºC] 
PVT-based J-PET 
scintillator 
260 - 300 
-13 - 27 
320 - 360 
47 - 87 
Pure PVT 
- 
- 
305 - 310 
32 - 37 

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66 
8.3 Investigations with Differential Scanning Calorimetry
 
The method of materials structure characterization which is complementary to 
PALS but more popular and conventional is Differential Scanning Calorimetry (DSC). It is 
based on the influence of the temperature on physical properties of the sample. During the 
measurement, the differences of temperatures are measured between the tested and the 
reference sample, in which no structural transitions occur. Structural changes in the 
examined sample are correlated with changes of heat capacity. Relying on this, exo - and 
endothermic processes in the sample can be identified. 
DSC measurements of polyvinyltoluene - based J-PET scintillator and pure 
polyvinyltoluene were carried out. Registered thermograms are presented in
Figs. 33 and 34. 
150
200
250
300
350
400
-6
-4
-2
0
2
4
6
Heat 
flo
w (end
o u
p) [mW]
Temperature [K]
-150
-100
-50
0
50
100
150
Temperature [

C]
Figure 33 Thermogram of J-PET scintillator containing 0.05 ‰ of novel WLS. Red line denotes heating, blue one 
cooling of the sample. 

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67 
150
200
250
300
350
400
0
5
10
15
20
25
30
Heat 
flo
w (end
o u
p) [mW]
Temperature [K]
-150
-100
-50
0
50
100
150
Temperature [

C]