T YASHODA, S KRISHNAVENI, SHIVALINGE GOWDA, T K UMESH* and RAMAKRISHNA GOWDA

Department of Studies in Physics, University of Mysore, Manasagangotri, Mysore 570 006, India

* Corresponding author

Abstract.

The K-shell X-ray fluorescence cross sections are determined experimentally for 10 elements such as Pb, Hg, Ir, W, Lu, Tm, Dy, Tb, Gd and Nd at excitation energy of 661.6 keV associated with g-rays of ¹³⁷Cs radioisotope. The technique employed involves the measurement of total intensity of fluorescent K X-rays that follow the photoeffect absorption of a known flux of g-rays using a well type NaI(Tl) detector. The obtained results are compared with the available theoretical values and other measured values.

Keywords:  Photoeffect; X-ray fluorescence cross section; K-shell fluorescence yield

Pacs Nos.  32.30.Rj; 34.50.Fa; 32.80.Fb; 32.80.Hd