Abstract
We have carried out a round robin test for the evaluation of sample damage of polyvinyl chloride (PVC) and nitrocellulose and cellulose acetate (NC-CA) due to monochromatic X-ray irradiation, and obtained the following results. It is possible to evaluate the sample surface damage from the degradation rate constants of PVC and NC-CA sample if we use the special holder developed in this research. This hoder has a hole on substrate to prevent the diffusion of the heat and also has a thin metal plate cover to keep the sample surface flat. The resulting ratio of the degradation rate constant of PVA to that of NC-CA is a universal constant (0.174 ±0.015), which is independent from used XPS instrument. Then, PVC and NC-CA will be good specimens for the indicator of X-ray source flux
