TY - JOUR
T1 - Mitigation of the proton-induced low temperature anomaly of LiF:Mg,Cu,P detectors using a post-irradiation pre-readout thermal protocol
AU - Parisi, Alessio
AU - Olko, Pawel
AU - Swakoń, Jan
AU - Horwacik, Tomasz
AU - Jabłoński , Hubert
AU - Malinowski, Leszek
AU - Nowak, Tomasz
AU - Struelens, Lara
AU - Vanhavere, Filip
N1 - Score=10
PY - 2020/1/21
Y1 - 2020/1/21
N2 - 7LiF:Mg,Cu,P (MCP-7) thermoluminescent detectors were exposed at nine positions within a 60 MeV pristine proton Bragg peak to investigate the possibility of counteracting the occurrence of their low temperature anomalous behavior (strong increase in the relative intensity of the peak 3 after exposure to energetic charged particles, Parisi et al., 2018 a) by using the post-irradiation pre-readout thermal protocol of 120°C for 30 minutes. Simulations with the Monte Carlo radiation transport code PHITS were performed in order to determine the absorbed dose, the LET and the specific energy density distributions within the detector volume as a function of its position along the Bragg peak. The experimentally determined efficiency values for the main peak signal agreed with the results of the Microdosimetric d(z) Model with an average deviation of 2.4%. The consistency of the results supports the hypothesis that the light signal of the main peak 4 partly arises from trapped charge carriers previously giving rise to the neighboring low-temperature peak 3 and that the non-standardized post-irradiation procedure is the reason for the spread in the experimentally determined proton efficiency data present in literature. Thus, for a correct dose assessment and to mitigate possible low temperature anomalies in the glow curve structure of LiF:Mg,Cu,P detectors, it is strongly advised to always employ the recommended preheat protocol of 30 minutes at 120°C.
AB - 7LiF:Mg,Cu,P (MCP-7) thermoluminescent detectors were exposed at nine positions within a 60 MeV pristine proton Bragg peak to investigate the possibility of counteracting the occurrence of their low temperature anomalous behavior (strong increase in the relative intensity of the peak 3 after exposure to energetic charged particles, Parisi et al., 2018 a) by using the post-irradiation pre-readout thermal protocol of 120°C for 30 minutes. Simulations with the Monte Carlo radiation transport code PHITS were performed in order to determine the absorbed dose, the LET and the specific energy density distributions within the detector volume as a function of its position along the Bragg peak. The experimentally determined efficiency values for the main peak signal agreed with the results of the Microdosimetric d(z) Model with an average deviation of 2.4%. The consistency of the results supports the hypothesis that the light signal of the main peak 4 partly arises from trapped charge carriers previously giving rise to the neighboring low-temperature peak 3 and that the non-standardized post-irradiation procedure is the reason for the spread in the experimentally determined proton efficiency data present in literature. Thus, for a correct dose assessment and to mitigate possible low temperature anomalies in the glow curve structure of LiF:Mg,Cu,P detectors, it is strongly advised to always employ the recommended preheat protocol of 30 minutes at 120°C.
KW - Thermoluminescent detectors
KW - LiF:Mg,Cu,P
KW - Relative efficiency
KW - Microdosimetric d(z) Model
KW - PHITS
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/37358801
U2 - 10.1016/j.radmeas.2019.106233
DO - 10.1016/j.radmeas.2019.106233
M3 - Article
SN - 1350-4487
VL - 132
SP - 1
EP - 6
JO - Radiation Measurements
JF - Radiation Measurements
M1 - 106233
ER -