5-KEV TO 160-KEV CONTINUOUS-WAVE X-RAY SPECTRAL ENERGY-DISTRIBUTION AND ENERGY FLUX-DENSITY MEASUREMENTS

Techniques developed for measuring the x-ray spectral energy distribut ion (differential intensity) from a tungsten-target bremsstrahlung x-r ay source are reported. Spectra with end-point energies ranging from 2 0 to 160 keV were recorded. A separate effort to calibrate the dosimet ry for the Phillips Laboratory low-energy x-ray facility established a need to know the spectral energy distributions at some point within t he facility (previous calibration efforts had relied on spectra obtain ed from computer simulations). It was discovered that the primary disc repancy between the simulated and measured spectra was in the L- and K -line data. The associated intensity (energy flux density) of the meas ured distributions was found to be up to 30% higher. Based on the meas ured distributions, predicted device responses were within 10% of the measured response as compared to about 30% accuracy obtained with simu lated distributions.