Elemental Analysis and Natural Radioactivity Levels of Clay by Gamma Ray Spectrometer and Instrumental Neutron Activation Analysis

Table 1

Irradiation conditions for the elements determined.

Irradiation time	Counting time	Decay time	Elements
1 m	4 m	5 m	Ti, Mg
5 m	15 m	1 h	M, Na
6 h	1 h	2 d	U, Sm, La, As, Ga,
6 h	8 h	14 d	Th, Rb, Nb, Cr, Sc, Co, Fe, Zn, Sn, Hf, Eu, Ce, Lu, Yb, Ta, Ba