NANOCRYSTALLINE COATING FOR UHMWPE PROSTHESES

Not Available Present day pulsed power generators provide such intense sources of bremsstrahlung that may radiation diagnostics are overwhelmed in the near field of the source. Time-integrated radiation-dose maps and spectral measurements are usually made in the near field with TLDs, while time-resolved spectral measurements are typically made in the far field with Si PIN diodes. There is a thus need for compact, time-resolved detectors that can be located in the near field along with a test object to determine the spatial distribution and the bremsstrahlung spectrum on test shots. AASC proposes to develop an instrument to measure the x-ray dose, uniformity and spectrum over a large surface area at the position of a test object in a high dose x-ray simulator with spatial and temporal resolution. In Phase I a prototype instrument will be validated on the MBS simulator at the Arnold Engineering and Development Center. MSB produces a dose of order 1 mca/cm2 with a 30-40 ns pulse-width over an area of 100 cm2. After the Phase I validation, the Phase II goal is to scale the instrument up to measure radiation from the Decade Quad source of about 20 krad (Si), 40-50 ns pulse-width, and 2500 cm2 area.