[en] For quality control, validation, and research and development in radiation processing with photons and electrons, standardized dosimetry, calibration and traceability are essential. Difficulties in achieving the objectives of reproducible and accurate high-dose dosimetry include the following influences on the measurement uncertainties: geometrical and environmental variabilities, dose rate and energy dependence, dosimeter system instabilities, type of radiation, type of analysis, radiation source factors, and precision of dosimeter supplies. The objectives under this Research Agreement are: 1) to develop special calorimetric approaches as means of calibration and traceability; 2) to evaluate the individual and combined uncertainties of a key radiation processing dosimetry system used by NIST for x- and gamma rays and electron beams, namely, alanine analyzed by EPR spectrometry. The NIST alanine dosimeter is studied as a reference transfer dosimetry system in terms of temperature dependence in its response to ⁶⁰Co gamma rays and the influence of relative humidity on post-irradiation stability. (author)