Dosimetry Comparisons Between Various Single Event Test Facilities

We compare the statistical errors in single event experiments at various facilities. It is possible to have systematic standard deviations in the data as large as 90%, and to have errors of 35% when the desired values are less than 10%. In general the systematic errors in dosimetry are much larger than the statistical errors in the data points. Observation of the dosimetry errors should be a major part of the data analysis. We examine several experiments that compared ionization induced errors by low energy ions and high energy ions at different facilities. They are consistent in showing that the results do not depend on ion or energy.