TY - JOUR
T1 - Relative thermoluminescent response of LiF-TLD to 252Cf fission fragments
AU - Horowitz, Y. S.
AU - Kalef-Ezra, J.
N1 - Funding Information:
Considerable effort has been invested in the study of the use of LiF thermoluminescent dosimeters (LiFTED) in exotic radiation fields such as mixed n-7 and various heavy charged particle radiation fields \[1\ ]. Because of the relevance to accurate intercalibration between these various radiation fields, Tanaka et al. \[2\]a nd many other investigators \[3\]a ttempted to established the existance of a universal ~HCP,'r *** versus LEToo/p dependence based on the assumption that the specific stopping power of heavy charged particles (HCPs) is the dominant factor that influences the relative TL response (*7) and furthermore * Partially supported by the United States-Israel Bi-Na-tional Science Foundation contract 1517 and the Inter-national Atomic Energy Agency Contract 2654/RB. ** In partial fulfillment of the requirements for the Ph.D. degree in Physics. *** The thermoluminescence efficiency, ak, is the ratio of the mean energy emitted as TL light, co, to the mean energy, e, imparted to the TL material by the radiation field a k = ~-e~.. -g is sometimes referred to as the "inte-gral" dose in the irradiated volume and is defined as the expectation value of the imparted energy. The relative TL response, r~kl, of a TL material of mass m and volume V is the ratio of the TL efficiencies for the two radiation fields k, 1 at "low dose", Do, i.e., where ~ is increasing linearly with dose. rlkl = ak(Oo)/al(Oo).
PY - 1981/8/15
Y1 - 1981/8/15
N2 - In the framework of our investigations into the use of modified track structure theory (TST) for the calculation of heavy charged particle (HCP) thermoluminescent (TL) yields, we have measured the relative TL response of LiF (Harshaw) to 252Cf fission fragments with the result ηff,α= 1.47 ± 0.34 (TLD-100), 1.25 ± 0.31 (TLD-600) and 1.24 ± 0.28 (TLD-700). The relative TL response at high ionization density is found to be strongly dependent on details of the high temperature annealing procedure and the former results for ηff,α are significantly reduced to 0.58 ± 0.1 (TLD-600, TLD-700) when oxygen-free nitrogen atmosphere and somewhat slower cooling is used during the annealing instead of air. The surprizingly high values of ηff,α obtained for both annealing procedures indicates a definite lack of unique correlation between η and stopping power (∼103 and 2 × 104 MeV ·g-1 cm2 for 4 MeV α-particles and 252Cf fission fragments respectively stopping in LiF). On the other hand, modified TST calculations which determine η via a convolution of the charge carrier concentration around the HCP track with the dose-TL response generated from low energy electrons are in good agreement with the experimental results.
AB - In the framework of our investigations into the use of modified track structure theory (TST) for the calculation of heavy charged particle (HCP) thermoluminescent (TL) yields, we have measured the relative TL response of LiF (Harshaw) to 252Cf fission fragments with the result ηff,α= 1.47 ± 0.34 (TLD-100), 1.25 ± 0.31 (TLD-600) and 1.24 ± 0.28 (TLD-700). The relative TL response at high ionization density is found to be strongly dependent on details of the high temperature annealing procedure and the former results for ηff,α are significantly reduced to 0.58 ± 0.1 (TLD-600, TLD-700) when oxygen-free nitrogen atmosphere and somewhat slower cooling is used during the annealing instead of air. The surprizingly high values of ηff,α obtained for both annealing procedures indicates a definite lack of unique correlation between η and stopping power (∼103 and 2 × 104 MeV ·g-1 cm2 for 4 MeV α-particles and 252Cf fission fragments respectively stopping in LiF). On the other hand, modified TST calculations which determine η via a convolution of the charge carrier concentration around the HCP track with the dose-TL response generated from low energy electrons are in good agreement with the experimental results.
UR - http://www.scopus.com/inward/record.url?scp=0019604323&partnerID=8YFLogxK
U2 - 10.1016/0029-554X(81)90383-9
DO - 10.1016/0029-554X(81)90383-9
M3 - Article
AN - SCOPUS:0019604323
SN - 0029-554X
VL - 187
SP - 519
EP - 525
JO - Nuclear Instruments and Methods
JF - Nuclear Instruments and Methods
IS - 2-3
ER -