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An account is given of a new type of emulsion chambers which have been in our use since 1997 in our RUNJOB program (RUssia-Nippon JOint Balloon-program). Each chamber is equipped with an additional ''diffuser module'' placed under the usual set of modules.We have made the experiments using 4cm thick diffuser modules composed of several photo-sensitive layers (X-ray films and/or nuclear emulsion plates)...
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