A BNCT treating planning system MCDB is developed.Three-dimensional material matrix and tally matrix are designed, which are used to describe voxel models and tally.A fast track technique is used in simulation.Computation time is greatly decreased compared with MCNP code.Same dosimetry results with MCNP are achieved by MCDB,which is faster by 3.1-3.4 times with respect to MCNP.Computation time and accuracy of most voxels reach clinical BNCT requirement in a scale of 10 million particles.

A self-optimizing cumulative inversion for particle size distribution with photon correlation spectroscopy is proposed.It improves precision and stability of measurement.From a detailed fundamental of photon correlation spectroscopy and conventional cumulative inversion,we analyze instability of cumulative inversion.A self-optimizing method is presented by using the minimum mean-square error.It inverts particle size distribution stably with scattered autocorrelation curve with random noise.Experimental results illustrate validity and feasibility of the approach.

The full-core plus correlation method(FCPC)is extended to calculate the energies and fine structures of 1s²4p states for the lithium-like systems with nuclear charge from Z=11 to 20.The transition energies(2s²S_1/2-4p²P_1/2,3/2) and dipole oscillator strengths are also calculated.The non-relativistic energies and wave functions are calculated by the Rayleigh-Ritz method.Relativistic and mass-polarization effects on the energies are included as the first-order perturbation corrections.The quantum-electrodynamics contributions to the transition energies are estimated by using the effective nuclear charge.Our results are in agreement with the experimental data available in the literature.

A reconstruction method is described for hexagonal assemblies. The program named JXJS has been encoded based on the model; The JXJS results are compared with calculated results by solving the equations in reference[1](61tri/hexagonal assembly) and analysis of error has been also performed.