TRACK SENSITIVITY AND MAXIMUM EXPOSURE DENSITY OF NUCLEAR-EMULSION INTHE CONTROLLED MODE

The paper presents the results of measurements of track sensitivity of controllable a ''primitive'' nuclear emulsion for particles with diff erent ionization densities. In the pulse electric field the probabilit y of such emulsion microcrystal development reaches 0.85-1 for particl es with ionization density I = (2-5) . I(r) (I(r) is the minimum ioniz ation density). The evaluated minimum threshold energy needed for deve lopment of primitive emulsion microcrystals is about 35 keV. It is sho wn that the Monte Carlo simulation can be used with success for evalua ting the maximum exposure density of a controllable emulsion track det ector.