TY - JOUR
T1 - Evaluation and modelling of the lithium fluoride based thermoluminescent detector response at the CERN-EU high-energy reference field (CERF)
AU - Van Hoey, Olivier
AU - De Saint-Hubert, Marijke
AU - Parisi, Alessio
AU - Caballero-Pacheco, Miguel Angel
AU - Domingo, Carles
AU - Pozzi, Fabio
AU - Froeschl, Robert
AU - Stolarczyk, Liliana
AU - Olko, Pawel
N1 - Score=10
Funding Information:
The authors wish to thank Marco Silari for kindly providing the required beam time at CERF. The authors also wish to thank EURADOS for the financial support in the form of a travel grant for Miguel Ángel Caballero-Pacheco and all EURADOS Working Group 9 members for the many fruitful discussions on this work.
PY - 2023/3/1
Y1 - 2023/3/1
N2 - Lithium fluoride (LiF) thermoluminescent detectors (TLDs) are commonly used for measurements in mixed high energy radiation fields such as space, hadron radiotherapy and other high energy accelerator facilities. However, the results of these measurements are often challenging to interpret since the radiation field compositions are not known a priori. The goal of this work was to model and understand the LiF TLD response in the CERN-EU high-energy Reference Field (CERF).Six different LiF TLD types, namely MTS (LiF:Mg,Ti) and MCP (LiF:Mg,Cu,P) TLDs with different Li abundances, were irradiated at CERF. For the modelling of their response, CERF reference fluence energy spectra from FLUKA simulations and TLD relative luminescence efficiencies according to the Microdosimetric d(z) Model were collected from previous works and supplemented with new relative luminescence efficiency calculations for neutrons with energies above 0.01 MeV. Dedicated MCNP6.2 simulations were performed to obtain the required fluence to absorbed dose conversion factors.Results demonstrated that the response of LiF detectors can be well predicted even for complicated, mixed radiation fields. The modelling allowed to assess the dose contributions from different radiation types in mixed fields. Based on the results of this work, a methodology was proposed to perform LiF TLD measurements in well-characterized mixed fields in terms of absorbed dose in water or tissue. In unknown mixed radiation fields MTS-7 TLDs are recommended to assess the non -neutron component of the absorbed dose in water or tissue. Assessing the dose from neutrons requires dedicated neutron detectors.
AB - Lithium fluoride (LiF) thermoluminescent detectors (TLDs) are commonly used for measurements in mixed high energy radiation fields such as space, hadron radiotherapy and other high energy accelerator facilities. However, the results of these measurements are often challenging to interpret since the radiation field compositions are not known a priori. The goal of this work was to model and understand the LiF TLD response in the CERN-EU high-energy Reference Field (CERF).Six different LiF TLD types, namely MTS (LiF:Mg,Ti) and MCP (LiF:Mg,Cu,P) TLDs with different Li abundances, were irradiated at CERF. For the modelling of their response, CERF reference fluence energy spectra from FLUKA simulations and TLD relative luminescence efficiencies according to the Microdosimetric d(z) Model were collected from previous works and supplemented with new relative luminescence efficiency calculations for neutrons with energies above 0.01 MeV. Dedicated MCNP6.2 simulations were performed to obtain the required fluence to absorbed dose conversion factors.Results demonstrated that the response of LiF detectors can be well predicted even for complicated, mixed radiation fields. The modelling allowed to assess the dose contributions from different radiation types in mixed fields. Based on the results of this work, a methodology was proposed to perform LiF TLD measurements in well-characterized mixed fields in terms of absorbed dose in water or tissue. In unknown mixed radiation fields MTS-7 TLDs are recommended to assess the non -neutron component of the absorbed dose in water or tissue. Assessing the dose from neutrons requires dedicated neutron detectors.
KW - Radiation
KW - Facility
KW - Measurements
U2 - 10.1016/j.radmeas.2023.106923
DO - 10.1016/j.radmeas.2023.106923
M3 - Article
SN - 1350-4487
VL - 162
JO - Radiation Measurements
JF - Radiation Measurements
M1 - 106923
ER -