8Sajedah MA, Ibrahim FA, Tahseen A, et al. Natural radioac- tivity in tap water and associated age - dependent dose and li- fetime risk assessment in Amman, Jordan [ J ]. Applied Radi- ation and Isotopes, 70, 692 - 698.
9Arndt MF, West L. A study of the factors affecting the gross alpha measurement in the highlands of northern Jordan [ J ]. Meas, 44, 102 - 110.