M. V. S. Chandrasekhar Rao

K-electron capture probability in 167Tm

The K-electron capture probability in the decay of 167Tm for the first-forbidden transition 1/2+ to 3/2- was measured using the sum-coincidence method and employing a hyper-pure Ge system. The PK value is found to be 0.835+or-0.029, in agreement with the theoretical value of 0.829.

Determination of Zinc in Human Head Hair Using Energy‐Dispersive X‐Ray Fluorescence Spectrometry

Zinc was determined in human head hair samples from male and female mental patients and normal subjects using energy-dispersive x-ray fluorescence spectrometry. The average Zn levels were higher in male mental patients than in normal subjects. No statistically significant difference was seen in the corresponding Zn values for females.

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).

Measurement on K-electron capture probabilities in the decay of 183Re and 168Tm

The K-electron capture probabilities for the 5/2+ to 3/2- transition in the electron capture decay of 183Re to the 208.805 keV level in the daughter 183W and for the 3(+) to 3- and 3(+) to 4/sup /transitions in the electron capture decay of 168Tm to the 1541.4 keV and 1093.9 keV levels, respectively, in the daughter 168Er were measured for the first time using an X- gamma summing method. The experimental PK values are reported in this paper, together with those due to theory, and discussed.

Measurement of K-electron capture probability in the decay of 87Y

The K-electron capture probability for the 1/2- to 3/2- transition in the decay of 87Y to the 873.0 keV level in the daughter 87Sr was measured for the first time using an x- gamma summing method. The experimental Pk value was found to be 0.911+or-0.047, in agreement with the theoretical value of 0.878.

A study of (Lβ2,15+Lβ5+Lβ6)/(Lα1+Lα2) ratio in 5d-shell elements and their compounds

Abstract We have studied the dependence of (L β2,15 +L β5 +L β6 )/(L α1 +L α2 ) ratio on the chemical constitution of the X-ray emitting atom in Hf, Ta, W and Hg of 5d-shell elements through a selective excitation of the L III subshell. The results show that the variation in this ratio is up to 25% when compared with those of pure elements.

Decay of 61 Cu

SummaryThe decay properties of61Cu produced by59Co (α, 2n) reaction is investigated with a 100 cc Ge(Li) detector. The present study confirms the presence of 215.5, 625.5, 947.3 and 1014.4 keV gamma transitions reported by Meyeret al. A new 117.5 keV gamma transition is also observed in the present studies. We found evidence for the existence of 701.1 and 2120 keV gamma transitions. There is no indication for the other new gamma-rays reported by Meyeret al. The rest of the decay scheme agrees with that of earlier investigations.RiassuntoLe proprietà di decadimento del61Cu prodotto dalla reazione59Co (α, 2n) si studiano con un rivelatore di 100 cm3 di Ge(Li). Il presente studio conferma la presenza di transizioni gamma a 215.5, 625.5, 947.3 e 1014.4 keV riportate da Meyeret al. Si osserva anche una nuova transizione a 117.5 keV. Abbiamo trovato la prova dell’esistenza di transizioni gamma a 701.1 e 2120 keV. Non c’è alcuna indicazione degli altri nuovi raggi gamma riportati da Meyeret al. Il resto dello schema di decadimento è in accordo con quello dei precedenti studi.РеэюмеИсследуются свойства распада61Cu, обраэованного в реакции59Co (α, 2n), испольэуя 100 cc Ge (Li) детектор. Проведенное исследование подтверждает сушествование гамма-переходов с знергиями 215.5; 625.5; 947.3 и 1014.4кзВ, о которых сообшали Мейер и др. В зтой работе сообшается о новом гамма-переходе 117.5 кзВ. Мы получаем подтверждение сушествования гамма-переходов с знергиями 701.1 и 2120кзВ. Другие новые гамма-переходы, обнаруженные Мейером и др., не подтверждаются. Остальные детали схемы распада согласуются с реэультатами предыдуших исследований.

Relative K-electron capture probabilities in the decay of 99Rh

The relative K-electron capture probabilities (P K ) to the 1383.23, 896.98, 618.09, 442.78 and 322.43 keV levels in 99 Ru in the decay of 99 Rh are measured employing the X- internal sum-coincidence technique. The measured values P K 1383.23 = 0.851 ± 0.066, P K 896.98 = 0.834 ± 0.061, P K 618.09 = 0.870 ± 0.01, P K 442.78 = 0.882 ± 0.035 and P K 322.43 = 0.852 ± 0.061 are found to be in good agreement with the theoretical values. The dependence of P K on EC transition energy is discussed.

Electron Capture Probabilities in105Ag

TheK-electron capture probabilities for the 1/2− → 3/2− and 1/2− → 1/2+ transitions in the decay of105Ag were measured for the first time using the sum coincidence method. The experimental PK values were estimated to be 0.824 ± 0.042 and 0.851 ±0.046 for the allowed and first-forbidden beta transitions, respectively in agreement with the theory. The PL experimental values to these two levels were also computed using the experimental PL/PK values reported by earlier authors. These results are also found to be consistent with the theoretical PL values.

Measurement ofK-electron capture probability in the decay of125I

SummaryTheK-electron capture probability (PK) of the allowed transition in the decay of125I to the 35.46 keV level in the daughter nucleus125Te was measured using X-γ internal summing method for the first time. The experimentalPK value was found to be 0.825±0.035 in agreement withPK (theory) equal to 0.804.