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Determination of Density of Nuclear Emulsion Plate by using Range- Energy Relation Calibration Source
- The density of nuclear emulsion plate is determined by using the alpha decays of thorium series, which is one of the range- energy relation calibration sources. We picked thorium series in the emulsion plate, Mod#64; Pl# 9, of KEK- E373 experiment. Five alpha decays from 228Th were observed in the decay chain of thorium series. Among the five α particles tracks, the α-particle from 212Po has higher energy than others and α-particle from 228Th, is observed a little distant from others, are used. We measured the position coordinates of the tracks of the α-particle by using microscope system. The range distribution is plotted as the squared length in the focusing direction, Δz2, versus the squared length in the direction perpendicular to it, Δx2 + Δy2. By fitting those data points with a straight line, we obtained the range of α particles as well as the shrinkage factor of nuclear emulsion. The range of α particles from 228Th is 23.358±0.263 μm. Using the average kinetic energy of α particles from 228Th of 5.400 MeV, the density of the emulsion is obtained by using range-energy program which is based on Barka’s equation, to be 3.745±0.042 g/cm3. On the other hand, for α particles from 212Po, kinetic energy 8.7MeV, is obtained as 48.464±0.355 μm, giving the emulsion density of 3.623±0.026 g/cm3. The density of the nuclear emulsion is determined from the mean of them, 3.684±0.049 g/cm3.
Khin Than Tint
- Myingyan Degree College Research Journal