فهرس المقالات Efficiency transfer method حرية الوصول المقاله صفحة الملخص نص كامل 1 - A study of the validity of the efficiency transfer method to calculate the peak efficiency using γ-ray detectors at extremely large distances Ahmed M. El-Khatib Mohamed S. Badawi Mohamed A. Elzaher Abouzeid A. Thabet 10.1007/s40094-014-0120-1