Thermal Cleaning (peak separation)
Overlapping peaks
sample is heated to appropriate
incremental intermediate
temperatures.
This technique is used when the
energy activation E has to be
determined by the initial rise
method where a clean initial rise of
the peak is needed.
Thermal cleaning allows to determine
the temperature of the maximum,
T
max, but not the intensity at the
maximum because the cleaning
thermal treatment could affect the
number of the trapped charges.
Thermal Cleaning (peak separation)
Initial
Real
Thermal fading
τ
1<
τ
2<
τ
3<
τ
4
The decrease of
the TL peak’s
intensity
according to the
expected kinetic
models and life
times of traps
0
100
200
300
400
500
0
5000
10000
15000
20000
25000
30000
(d)
(c)
(b)
TL
(a.
u.
)
Temperature (
C)
(a)
τ
1
τ
2
τ
3
τ
4
Anomalous fading
τ
1
~ 1-2
hours
τ
2
~ 5 years
The charges are released
by the trap at a rate
which is much faster
than those expected
according to the lifetime
of the trap while the
phenomenon is wekly
temperature dependent
Anomalous fading: examples
CVD
diamond
Anomalous fading: examples
Fluor-apatite
But mostly feldspars (
x[AlSi
3
O
8
]
, x = K, Na, Ca)
100 200 300 400 500 10000 20000 30000 40000 50000 60000 70000 80000 100 200 300 400 500 100 1000 10000 TL (a .u .) Temperature (oC) T L ( a.u .) Temperature (oC) 0 100 200 300 400 500 10000 20000 30000 40000 50000 60000 0 100 200 300 400 500 100 1000 10000 Temperature (o C) A rt ifi ci al ly In du ce d TL (a .u .) Temperature (oC) A rti fi ci al ly In d u ced T L (a. u .)KAlSi
3
O
8
NaAlSi
3
O
8
I. Eliyahu , Y.S. Horowitz , L. Oster , S. Druzhyna , I. Mardor
Nanodosimetric kinetic model incorporating localized and delocalized
recombination: Application to the prediction of the electron dose response of the peak 5a/5 ratio in the glow curve of LiF:Mg,Ti (TLD-100)
Radiation Measurements, 2014
