29 mm Diameter Test Target Design Report

Status of Additive Manufacturing Capabilities for Processing Refractory Alloys Under the Mo-99 Program

“…Exposing the disk to the accelerator will cause high-temperature gradients throughout the disk. These disks will be grouped in stacks of 60 and exposed to the accelerator for up to 6 days [4,5]. Helium will be used as a coolant and jetted in between the front and back face of disk.…”

Testing of Helium-Cooled Metal Molybdenum Disk Target

“…The resulting disks do not possess tensile strength as high as solid molybdenum and might not survive the vibration from the high-velocity helium coolant and high thermal stress from beam heating. An Argonne team of scientists performed a series of tests at Argonne's Low Energy Accelerator Facility (LEAF) [3][4][5][6][7]. This report describes two series of tests for scale down production target designs that utilize full-scale 29 millimeters diameter, 0.75 mm thick press-and-sintered disks.…”

Small Punch Testing of Molybdenum-99 Targets

“…The accelerated electron beam will be directed toward a tungsten (W) window, producing X-rays that then hit the aMo target and knock off one neutron to make 99 Mo. The aMo targets will be stacked into a holder designed with He flow in between each target for heat rejection [4,5]. Therefore, these targets will be subjected to a thermal-pneumatic conditions necessitating the understanding of the aMo target's mechanical performance.…”

“…Currently, the design of the aMo target has a disk geometry with a total diameter of 29 mm and a thickness of 0.5 mm, including tight tolerances in average height [4]. Typically, most Mo products are fabricated from powder feedstock.…”