Authors:N. Krasnov, B. Zatolokin, and I. Konstantinov
It is shown that three different approaches to calibration technique based on the use of average cross-section, equivalent
target thickness and thick target yield are adequate. Using the concept of thick target yield, a convenient charged particle
activation equation is obtained. The possibility of simultaneous determination of two elements impurities, from which the
same isotope is formed, is pointed out. The calibration technique, in which thin standard is used but activation curve is
not required, is discussed.
Authors:B. Zatolokin, I. Konstantinov, and N. Krasnov
The influence of activation of Ta by secondary neutrons on the results of proton activation instrumental analysis of W in
Ta is described. It is shown that the detection limit of W in Ta using 11 MeV protons cannot be lower than 3 ppm.
Authors:I. Konstantinov, B. Zatolokin, N. Krasnov, Yu. Sevastyanov, and L. Volkova
Procedures for determining traces of calcium, titanium, vanadium, chromium, iron, copper, niobium, molybdenum and tungsten
in tantalum are described utilizing 11 MeV proton activation. The instrumental method of analysis with the use of a Ge(Li)
detector and the radiochemical separation of the corresponding fractions are described. The formula for the calculation of
the concentration of traces with the use of thick target yields is given. Experimental data on the thick target yields of
radioisotopes44Sc,52Mn,56Co,65Zn,93mMo,96Tc are presented. Based on the experimental data, the detection limits are estimated at 1–10 ppb for the above mentioned metal
traces in tantalum. The successful solution of the task of the simultaneous determination of nine elements in tantalum confirms
the wide applicability of proton activation analysis.