Bechtel Nevada, Mail Stop NLV 018, Post Office Box 98521, Las Vegas, NV 89193-8521

66 -- CONTINUOUS X-RAY SOURCE, INCLUDING POWER SUPPLY AND COOLING SYSTEM SOL BW002-DJ-99 DUE 072899 POC Dennis J. Jeffrey, (702) 295-2192 E-MAIL: Click here to contact the contracting officer via, jeffredj@nv.doe.gov. CONTINUOUS X-RAY SOURCE Continuous X-ray source, including power supply and cooling system (if required) which supplies the following: REQUIREMENTS: Signal level: Unit must generate sufficient x-ray flux to ensure that 109 x-rays per second pass through an aperture 1/4 x 1/8 in located a minimum of six feet from the x-ray head. It is preferred that the x-ray beam be focused or at least collimated rather than omni-directional. X-ray energy spectrum: Molybdenum has proven successful in a similar application. We must be able to observe significant attenuation by 1" thick plastic (Lexan) as it eclipses the beam transmitted through the aperture. Ripple: Variation in the x-ray flux must be < 1.0% of average signal level up to frequencies in excess of 10 MHz. This is essential to ensure unambiguous definition of the time when the signal is eclipsed. Continuous Operation: Unit must be capable of being operated continuously for at least 20 min. Physical Constraints: X-ray head must be separable from power supply by at least 6 ft. Prefer separation > 10 ft if possible. Power supply will be installed at floor level; x-ray head will be approx eight to 10 ft above floor. Power Requirements: Both 110 and 220-V power are available. DESIRED: X-ray Energy Spectrum: Would appreciate the option to change tubes to optimize absorption by the target. In the future, it may be determined that a Mo tube is not optimum for the application. Physical Constraints: X-ray head will be mounted on a vacuum- and pressure-sealed column which is four- to six-inches in diameter. Would prefer flange on x-ray head to facilitate mounting such that the x-ray beam is directed axially through the mounting column. Beam power monitor: Would appreciate the ability to monitor the power emitted by the x-ray head independent of the detector being used to measure transient absorption by the target. Posted 07/14/99 (W-SN353778). (0195)

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