TY - JOUR
T1 - Apparent anomalous fading of thermoluminescence associated with competition with radiationless transitions
AU - Chen, R.
AU - Leung, P. L.
AU - Stokes, M. J.
PY - 2000/12/15
Y1 - 2000/12/15
N2 - Anomalous fading of thermoluminescence (TL) is the effect of a fading which is significantly faster than what is warranted by the trapping parameters which are evaluated from the features of the TL peak in question. A previous work suggested that in certain cases, apparent anomalous fading may be a normal fading in disguise. The idea was that, at least in some cases, radiationless transitions into competing recombination centers may yield a very narrow peak which, while using either the curve fit technique or the different peak shape method will result in very high values of effective activation energy E and frequency factor s which, in turn, will yield an apparent life-time orders of magnitude higher than the real one. The question has been raised whether this anomaly is observable only when the peak shape methods are utilized and in particular, can the same effect occur when the broadly used initial-rise method is applied. It is demonstrated in this work that under similar circumstances of competition, very high effective values of E and s are evaluated which result in very high life-times when the activation energy is evaluated by the initial-rise method. Thus, the explanation of apparent anomalous fading as being a normal decay in disguise, is extended to cases in which the initial-rise method is utilized for the parameter evaluation.
AB - Anomalous fading of thermoluminescence (TL) is the effect of a fading which is significantly faster than what is warranted by the trapping parameters which are evaluated from the features of the TL peak in question. A previous work suggested that in certain cases, apparent anomalous fading may be a normal fading in disguise. The idea was that, at least in some cases, radiationless transitions into competing recombination centers may yield a very narrow peak which, while using either the curve fit technique or the different peak shape method will result in very high values of effective activation energy E and frequency factor s which, in turn, will yield an apparent life-time orders of magnitude higher than the real one. The question has been raised whether this anomaly is observable only when the peak shape methods are utilized and in particular, can the same effect occur when the broadly used initial-rise method is applied. It is demonstrated in this work that under similar circumstances of competition, very high effective values of E and s are evaluated which result in very high life-times when the activation energy is evaluated by the initial-rise method. Thus, the explanation of apparent anomalous fading as being a normal decay in disguise, is extended to cases in which the initial-rise method is utilized for the parameter evaluation.
UR - http://www.scopus.com/inward/record.url?scp=0343878076&partnerID=8YFLogxK
U2 - 10.1016/S1350-4487(00)00082-2
DO - 10.1016/S1350-4487(00)00082-2
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AN - SCOPUS:0343878076
SN - 1350-4487
VL - 32
SP - 505
EP - 511
JO - Radiation Measurements
JF - Radiation Measurements
IS - 5
T2 - Proceedings of the 9th International Conference on Luminescence and Electron-Spin Resonance Dating (LED99)
Y2 - 6 September 1999 through 10 September 1999
ER -