Excitation characteristics of elements above Z=30 with57Co,67Ga,75Se,99mTc,111In,125I and201Tl implant sources

Radioactive implant induced X-ray emission (RIXE) spectrometry was examined by mixing a sample in solution with a radioisotope. The radioisotopes of⁵⁷Co,⁶⁷Ga,⁷⁵Se,^99mTc,¹¹¹In,¹²⁵I and²⁰¹Tl were used as implant X-ray excitation sources. Copper, strontium, iodine, barium, lead and uranium solutions were used as samples to be analyzed. K X-ray for all samples and L X-rays for lead and uranium samples were measured with a pure Ge detector. The excitation characteristics of each radioisotope are discussed using the effective excitation efficiency (eff) defined by the equation eff=N_c/(N_aN_d), where N_c is the number of counts in the X-ray peaks, N_a is the number of atoms of interest in the sample, and N_d is the total number of decays of radioisotope for the counting interval.