A survey has been made on the application of charged particle activation analysis for the detection of traces of medium Z
elements (40≤Z≤58, 72, 74) using protons and deuterons of 20 MeV,3He and4He ions of 40 MeV. The product nuclides considered were γ-ray emitting radioisotopes with half lives ranging from 10 min to
3 days. Based on the thick target yields obtained, proton activation was found to provide an optimum compromise between sensitivity
Reaction yields on thick zirconium targets with proton, deuteron,3He and4He activation have been measured and compared. The most favorable reaction combining high sensitivity and selectivity was
found to be Zr(p, xn)90Nb. The absolute cross-section for this excitation function has been measured for proton energies up to 20 MeV. Analytical
applications are illustrated with nondestructive zirconium analyses in glass. Yields from the thick target experiments indicate
that the detection limit for this zirconium analysis method is ∼1 ppb.
The reaction103Rh(p, n)103Pd was investigated for the trace detection of Rh. Maximum activation of Rh with minimal interferences was achieved with protons of 11 MeV. The detection limit for the nondestructive assay of Rh is 0.03 ppm.
Excitation functions for proton energies up to 20 MeV have been measured for65Cu(p, n)65Zn; Sn (p, xn)115Sb,116mSb,117Sb,118mSb; Mo (p, xn)94Tc; Te (p, xn)121I,123I,128I,130I; Pd (p, xn)104Ag; Cd (p, xn)109In,110mIn,113mIn; Cs (p, xn)133mBa. The precision of the measurements (overall error estimated at ≤20%) and the conditions for interference-free detection
of these elements at trace levels are also discussed.
Authors:J. Poland, S. Kormali, W. James, and E. Schweikert
The feasibility of charged particle activation analysis for phosphorus measurements was evaluated. Several nuclear reactions were studied with respect to pertinent activation data, thick target yields for calibration, relative excitation functions, and quantitative importances of interferences. Determination of phosphorus by the reaction31P(,n)34mCl was determined to be most advantagous with sensitivity competitive with other techniques.
Authors:S. Kormali, W. James, J. Poland, and E. Schweikert
The application of charged particle activation analysis to the determination of phosphorus in a variety of sample materials is discussed. The activity produced via the31P(, n)34mCl reaction is quantitated either nondestructively or using postirradiation radiochemical separations depending on the characteristics of the sample matrices. Corrections which are necessary for the determination of phosphorus in pure tantalum metal due to spectral interferences are discussed.