Electrochemical Preparation of Thin Metal Films as Standards on Pyrolytic Graphite

Radiochemical analysis :

“…The data obtained for the determination of mercury is reported in table 21 The precision is acceptable by normal analytical standards, but the accuracy is poor at the 0.01 and 0.001 Ag/ml levels. The accuracy can be corrected to within 4% of the added value by the use of a calibration curve which allows the sample to be bracketed.…”

“…Comparison of these values to the impurity levels to be found in the pyrolytic graphite used by Bassos, et al , is difficult, since they quoted no impurity levels and included only one spectrum of the graphite [21]. However, from this spectrum it is estimated that their impurity levels are about the same Since these isomers are induced by relatively low energy gamma rays, corrections will be necessary for the photon flux attenuation in different matrices.…”

“…The system is comprised of three parts: phase I (figure 20) is the interface translator unit providing the readout function, phase II (figure 21) is the readin section allowing data previously read out on punch tape to be reintroduced into an analyzer's memory, and phase III (figure 22) is the precursor data section which provides time of year, identification, and other externally gathered data to be formated ahead of the analyzer's System control is also provided by the circuit (figure 23). The interface units were built of modular circuit boards designed by the Data Automation Group of the National Bureau of Standards.…”

“…During the past year, however, several deficiencies have been noted and design changes made (See figures 20,21,22) notably, revision of the "interlock circuit" in phase I, the "bit transfer gates and monostables" in phase II, and the "precursor start up" phase III.…”

Electroanalysis and Coulometric Analysis

“…The method combines the selectivity of controlled potential procedures with the sensitivity of neutron activation analysis; determinations of Ag in concentrations as small as 1CVLV have been accomplished. Deposition of Au, Ag, Cu, and Co on a pyrolytic graphite electrode under carefully controlled conditions has also been shown to be useful in the preparation of standards (289). Dryburgh (68) described a cell for preparation of sample of radioactive samples by small scale electrodeposition; the preparation of a 14.4-k.e.v.…”