قياس عامل التراكم لأشعة كاما في مادة الحديد و الألمنيوم كدروع متحركة باستخدام الكاشف الوميضي NaI (Tl)‎

Abstract EN

In the present work , the gamma ray buildup factor has been Calculated for iron and aluminum as a fixed and moving shields with two velocities ( V1= 16 cm/sec ) and ( V2= 18 cm/sec ) for thicknesses ( 0.1 - 1 ) cm .

by using the scintillation detector NaI(Tl) ( 2" x 2" ) and two radioactive sources Cs-137 & Co-60 .

The effect of the shield movement , its thickness and the radioactive source energy on the buildup factor has been studied .

It was found that the buildup factor for iron decreased with a moving shield , The buildup factor at (V1) velocity was less than that at (V2) velocity .

while , the buildup factor increased for aluminum The buildup factor at (V2) velocity was greater than that at (V2) velocity .

The buildup factor increased with the thickness of the shield for all studied cases .

It was found that the buildup factor with Co-60 source was greater with Cs-137 source for all fixed and moving cases .