A present invention provide a technique for easily forming a high-quality cobalt base film, which have a small specific resistance. The amplification and separation steps may be iterated through one or more additional cycles to enhance sensitivity. When a request is received to update the software program with an update package, a package number of the update package may be compared to the locked version number. Methods of fabrication of such radiation detectors are decribed. A third approach includes applying a bias potential to the nozzle assembly to raise the potential of the nozzle assembly to the potential of the arc.