A new approach to estimate the geometrical factors, solid angle approximation, geometrical efficiency and their use in basic interaction cross section measurements

¹ Istituto di Matematica e Fisica, Universita di Sassari, Via Vienna 2, 07100 Sassari, Italy
² Dipartimento di Fisica, Universita di Roma “La Sapienza”, Ple A. Moro 2 00185, Roma, Italy
³ Institute of Clinical Medicine, University of Tsukuba-shi, Ibaraki 305-8575, Japan
⁴ Faculty of Engineering, Yamagata University, Yonezawa-shi, Yamagata 992-8510, Japan

Corresponding author: dvrao@ssmain.uniss.it

Received: 12 February 2002
Revised: 12 July 2002
Accepted: 23 July 2002
Published online: 1 October 2002

Abstract

A new approach is developed to estimate the geometrical factors, solid angle approximation and geometrical efficiency for a system with experimental arrangements using X-ray tube and secondary target as an excitation source in order to produce the nearly monoenergetic Kα radiation to excite the sample. The variation of the solid angle is studied by changing the radius and length of the collimators towards and away from the source and sample. From these values the variation of the total solid angle and geometrical efficiency is deduced and the optimum value is used for the experimental work.