Abstract
Abstract Thin layer dosemeters are suitable for rapid laser heating and for the detection of knock-on protons produced in hydrogenous materials by collisions with fast neutrons. In an attempt to establish the optimum design parameters for a fast neutron dosemeter based on such a proton radiator, we calculate the proton conversion efficiencies and the resulting normalised TL signals for CaSO4:Dy layers of various thicknesses. On the basis of the known neutron energy spectra of 252Cf, moderated 252Cf, and Pu-Be neutron sources, the generation of protons in polyethylene foils, placed in close contact with the TLD layer, and the energy deposited by these protons in the CaSO4:Dy layer are computed. The results are compared with experiments performed in mixed neutron-gamma fields with 9 mm2 spots of this TL phosphor on borosilicate glass substrates heated with a computer-controlled CO2 laser beam of uniform intensity profile.
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