N. Venkateswara Rao

Kβ/Kα x-ray intensity ratios

Abstract The K β /K α X-ray intensity ratios in the elements Bi, Th and U were measured using a high resolution hyper pure germanium detector system. These results were combined with the values for Z between 20 and 82 as reported by the present authors and fitted to a polynomial. The fitted values are found to be in satisfactory agreement with the experimental values as well as with those due to Scofield. The most probable values of K β /K α are interpolated from the fit for several elements in the region of Z between 83 and 92.

Anomalous Conversion Coefficient of the 150.6 keV (11/2-→5/2+)Transition in 111mCd

The total conversion coefficient of the 150.6 keV (E3) transition in the decay of 11/2 - state ( T 1/2 =48.6 minutes) in 111m Cd is determined employing a high resolution HpGe detector system and the intensity balance method. The experimentally measured α T is found to be 1.76±0.08 and deviate from the theoretical value of Hager and Seltzer by (23±3)%. The E3 hindrance with respect to the single particle estimate is determined to be 8.5×10 3 . The results are discussed.

Measurement of conversion coefficients of M3 transition in 60mCo and M4 transition in 90mY

The K-conversion coefficient of 58.6 keV (2+ to 5+) M3 gamma transition in 60mCo and the total conversion coefficient of 479.53 keV (7+ to 3-) M4 gamma transition in 90mY were measured by X-ray, gamma -ray and intensity balance methods, respectively, using high-resolution solid-state detectors. The values obtained were alpha K=39.04+or-1.90 in 60mCo and alpha T=0.0990+or-0.0013 in 90mY. These results are seen to be consistent with the theoretical values due to Rosel and co-workers (1978).

K-Conversion Coefficient of the 34.2 keV (4+→7+)Transition in 96mTc

The 34.2 keV isomeric state (4 + ) with T 1/2 =52 min was produced via 93 Nb(α, n ) 96m Tc reaction at a beam energy of 15 MeV. The K-conversion coefficient, α K of the 34.2 keV, M3 transition (4 + →7 + ) was determined for the first time using the XPG technique. The value of α K was found to be, 1880±145, which is in agreement with the theoretical value of 1735 due to Hager and Seltzer for a pure M3 transition.