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In our institution there is a considerable amount of patients suffering skin carcinomas, for which, the treatment using small fields of high energy electronis a common option of treatment. The dosimetry using ionization chamber in small electron fields of high energy, according with the international protocols of dosimetry, requires of ionization chambers with special characteristics; equipment that our institution does not count; so it is necessary an alternative method to make these measurements. The linear behaviour of the electron films in energies greater than 250 keV; makes the film dosimetry one of the best options to make measurements in small electron fields of high energy; as much by its quality of results, information and low cost. The objective of this work is to provide to the Radiotherapy Department of the National Institute of Neoplasics Diseases a practical method, safe a...