Construction and Calibration of the NIST Large-Area-Source X-Ray Counting System.
This paper describes the construction and calibration of the NIST large area x-ray counting system.238Pu sources 8 in (20.32 cm) by 5 in (12.70 cm) thick, emittingLx rays in the range of 12-20 keV are calibrated for total emission rate and also for rate through a centrally located 3 in (7.63 cm) diameter aperture. Alpha particle emission rates are obtained using the known x-ray to alpha particle abundances. The sources will be used to calibrate alpha-particle surface monitors.
National Institute of Standards and Technology, Gaithersburg, MD 20899.
J M R
JM
Hutchinson
National Institute of Standards and Technology, Gaithersburg, MD 20899.
M P
MP
Unterweger
National Institute of Standards and Technology, Gaithersburg, MD 20899.
P A
PA
Hodge
calibration; efficiency curve; large area source; plutonium-238; proportional counting; x ray