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We performed theoretical investigation on mechanisms of LiD/LiH/LiT+H2O reactions with second order perturbation theory (MP2). Calculations of enthalpy change and reaction rate constant are in agreement with experimental data and other theoretical values. Results show that two reaction channels exist for LiD + H2O reaction, and channel 1 is the main reaction channel. Kinetic Isotope Effect (KIE) is not so large although fracture of isotope bond takes place in the reaction, which is noticeably different from theoretical maximums of primary isotope effect. Individual contributions of KIE effect are listed as follows ηvib > ηrot > ηtun > ηpot > ηtrans, indicating that main contribution of isotope effect results from vibration factor.

Summary: A new measurement method for determination Solid State nuclear track by the change of the specific heat capacity is proposed. The feasibility of the method is discussed in both theory and practice, to determine the solid state nuclear tracks by specific heat capacity when annealing. In the research, the change of the specific heat capacity is related with nuclear track numbers after annealing and it could be measured and verified time after time. The theory and experiments are introduced with details. The potential applications of this method in the future are discussed, such as determination of the neutron flux at high lever reactors and geologic age of the geological samples. Keywords: Solid state nuclear track, Heat capacity, Annealing

On the basis of previous research achievements of measuring the solid state nuclear track in apatite by thermal analysis method, the author further proposes the research program to measure the energy deposited by the solid state nuclear track contained in zircon, sphene, epidote, apatite and other samples, in order to study the geological age and geothermal history. Compared with the measurement of nuclear track density by etching method, this one does not need to conduct so many processing programs for samples, but can improve the measurement accuracy.