A Simplified Routine Method for X-Ray Absorption Edge Spectrometric Analysis.

Tokai advanced safeguards technology exercise task T-F: study of selected capabilities needed to apply DYMAC principles to safeguarding the Tokai reprocessing plant

“…3, shows, the concentrations of both the uranium and plutonium are very low at this point, 0.6 g U/L and 1.9 g Pu/L. 10 30 100 U CONCENTRATION (mg/g) where it is 252 g/L. The higher concentration attenuates the soft x-rays too much and sample thickness becomes difficult to manage.…”

X-Ray Absorption and Emission

“…For problems such as the major constituents in an inclusion or localized contamination, qualitative results are sufficient. Recent publications on macroprobes are of two general types: instrumentation modification and evaluation (48,49,176,307,614,615) and applications (52,114,307).…”

Internal Differential X-Ray Absorption Edge Spectrometry

“…Adsorption chromatographic separation, followed by further characterization of the resulting fractions by other analytical methods, permits a highly detailed analysis of most petroleum samples and has been frequently used for nonroutine analyses of petroleum-e.g., (2,8). A number of papers have described more or less routine procedures for the separation of high boiling samples into several compound class fractions by adsorption chromatography-e.g., (1,6, 9), and many petroleum laboratories have similar unpublished methods; none of these procedures appears quantitative, however, or even applicable to a wide range of sample types-e.g. see (18) for a discussion of the problems involved.…”

“…)• Berlin's recent 1 Present address, Sel-Rex Corp., Nut,ley, N. J. 07110 paper (1) in which secondary target materials are used to generate the' absorbed x-ray radiation lists many characteristic lines of elements which bracket absorption edges of elements to be determined. This paper describes methods that utilize x-ray radiation either generated within or scattered by the sample itself.…”

“…In the simplest case, the K series, the x-ray photons Ka and ß are produced in the following manner by an atom. K state -L state + Ka photon (1) K state -M state + ß photon (2) That is, the K state, a K shell electron ejected, can undergo two processes, replacement by either an L or M shell electron. The L state process is about five times more likely to occur according to the selection rule.…”