A method of isolating .sup.99Mo produced using a (n,) reaction according to example embodiments may include vaporizing a source compound containing .sup.98Mo and .sup.99Mo. The vaporized source compound may be ionized to form ions containing .sup.98Mo and .sup.99Mo. The ions may be separated to isolate the ions containing .sup.99Mo. The isolated ions containing .sup.99Mo may be collected with a collector. Accordingly, the isolated .sup.99Mo may have a relatively high specific radioactivity and, in turn, may be used to produce the diagnostic radioisotope, .sup.99mTc, through radioactive decay.

A rotating heat regenerator is used to recover heat from the syngas at it exits the reactor vessel of a waste or biomass gasifier. In some embodiments, three or more streams are passed through the heat exchanger. One stream is the dirty syngas, which heats the rotating material. A second stream is a cold stream that is heated as it passes through the material. A third stream is a cleaning stream, which serves to remove particulates that are collected on the rotating material as the dirty syngas passes through it. This apparatus can also be used as an auto-heat exchanger, or it can exchange heat between separate flows in the gasifier process. The apparatus can also be used to reduce the heating requirement for the thermal residence chamber (TRC) used downstream from the gasification system

The present invention discloses a non-thermal plasma treatment of metal powders in order to improve their processability by additive manufacturing (AM). The invention consists in bonding primary particles constituted of metals or metal alloys to a plurality of secondary particles constituted of metals, metal alloys, ceramics or polymers by the mean of a non-thermal plasma treatment. The primary particles have a larger mean diameter than the secondary. Both particles are injected through a non-thermal plasma glow discharge and/or in its afterglow region (region downstream the plasma discharge) where their surfaces are cleaned by removing contaminants and/or oxide layer and activated to react between each other. The functionalized metal powders are then collected and afterwards processed by AM leading to high quality parts. The functionalized metal powders produced by this plasma treatment improve the processability of metal by AM.