During their exposure, nuclear emulsion sheets detect both tracks fromexperiment-related particles, as well as a considerable amount of backgroundtracks, mainly due to cosmic rays. Unless the exposure has been fairly short,it is therefore fairly likely that a fraction of the tracks that have beenidentified as belonging to the particles the experiment is interested in, arereally due to background. A method, which allows to measure this fractionreliably directly from the data, is described. Comment: 7 pages, uses elsart, to be published in NIMA 450, p 441
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