ON THE NUCLEAR-EMULSION DETECTION EFFICIENCY FOR ALPHA-PARTICLES AND FISSION FRAGMENTS

In this work, the efficiency (epsilon) of the Fuji ET2F nuclear emulsi on loaded with samarium was determined, for the detection of alpha-par ticles with energies greater than or equal to 2 MeV. By performing mea surements of the superficial track density in five different exposure times varying between 15 and 54 days, the result epsilon=1.000+/-0.022 was obtained. Practically the same result, 0.999+/-0.021, was obtaine d for alpha-particles having energies higher than 4.2 MeV, in the case of K0 Ilford uranium loaded emulsions developed 1.359 and 2.273 days after the loading. Since the linear density of Ag grains is high in bo th emulsions, the result obtained for the ET2F can be extended to the K0 one. In this way, the final result for the efficiency of K0 Ilford and ET2F Fuji nuclear emulsions for alpha-particles having energies hi gher than 4.2 MeV, can be adopted as equal to 1.000+/-0.015. By means of using an adequate development process, these results can be used in the case of fission fragments detection.