دراسة النشاط الإشعاعي الطبيعي لنماذج مختارة من تربة بعض مدارس مدينة القاسم باستعمال مطيافية أشعة كاما

Abstract EN

In this work, the natural radioactivity levels were determined in some selected samples of soil of certain schools in Al Qassim city in the province of Babylon, Iraq using gamma ray spectroscopy technique of Sodium Iodide doped thallium type whose dimensions are " 3×3", the radiation hazards indices were also calculated such Raeq, Internal and external hazards' index, representative index , average absorbed dose and the annual average effective dose resulted from the existence of radioactivity for all studied samples.

The results demonstrated that the average values of the specific activity for each of 238U, 232Th, and 40K were 13.183 ± 0.636 Bq/Kg), (55.477 ± 2 Bq/Kg) and (303.574 ± 2 Bq/Kg) respectively.

Regarding the average values of the hazards indices, they were as follow: the average value of Raeq and the average absorbed dose in air were (11.891Bq/Kg,53.201nGr/h); the average annual effective dose values together with the internal and external hazards indices and gamma representative indices were (0.065 mSv/yr) (0.260 mSv/yr), (0.348, (0.312) and (0.844), respectively.

When comparing the results of the studied samples with the national standards (UNSCEAR 2000) which is 33 for 238U, 45 for 232Th and 412 for 40K.

It was found that these values are within the permissible limits for the majority of the samples, regarding the hazards indices, it was found their values were below the recommended international levels which would indicate the studied area is radiologically safe.