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[en] The properties of nuclear emulsions and methods of work with them are given. (M.D.)

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[en] A possibility of P type nuclear emulsion sensitivity increase by means of an electric field of 4x10⁶ V/cm² strength is investigated. Emulsion (10 μm thick on 50 μm thick lavsan basis) was irradiated by a pulsed ligtht source with luminescence duration of 10^-6 s in model experiments. Seven-fold increase of sensitivity without fog growth is attained. Application of 10³ electric pulses to emulsion did not result in appearance of fog

[en] A method is proposed for introducing lithium into thicklayered nuclear photoemulsions by treating them with lithium salt solutions. A distinctive feature of this method is that the photoemulsion is first treated with an aqueous-alcoholic solution of glycerol and then the glycerol-treated emulsion layer is covered with an aqueous solution of lithium acetate, 55-75 mg lithium per 1 cm³ of emulsion. The proposed method is capable of introducing 3 to 5 times more lithium than any method known

[en] Fast 4π solid angle particle track recognition has been a challenge in particle physics for a long time, especially in using nuclear emulsion detectors. The recent advances in computing technology opened the way for its realization. A fast 4π solid angle particle track reconstruction based on GPU technology combined with a multithread programming is reported here with a detailed comparison of processing time by CPUs with respect to using GPUs. By employing 3 state-of-the-art GPUs with a multithread programming, a 60 times faster processing of 3D emulsion detector data has been achieved with an excellent tracking performance in comparison with a single-thread CPU processing, corresponding to processing of 15 cm² emulsion surface scanned per hour

[en] A method is suggested for determination of the thickness of nuclear photoemulsions applied in luminous- and electron-microscopy autoradiography. The method is based on measuring both the speed of sample withdrawal out of the emulsion melt and the thickness of the emulsion layer applied. The emulsion layer is obtained by the slide submergence technique. Using the least square fit the curve was obtained for the dependence of the emulsion applied layer thickness on the speed of sample withdrawal out of the emulsion melt. The proportionality coefficient, k, has been defined, to characterize the emulsion properties. Thus, basing on the emulsion thickness required for the autoradiography system and knowing the k value, it is possible to determine the sample withdrawal speed corresponding to the given thickness. Every type of emulsion has its own k-value which also depends on the batch of the nuclear emulsion used

No abstract available

[en] A 3.D extensive simulation in heavy absorbers has been carried out. The results are compared with the cascades produced by electrons beams up to 300 GeV in emulsion chamber. At higher energy, cascades including Landau-Pomeranchuk effect are discussed

No abstract available