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حفاظ گذاری

تاریخ:پنجشنبه 5 شهریور 1388-11:49 ق.ظ

حفاظ گذاری :

هدف از حفاظ گذاری كاهش پرتوگیری افرادی است كه در مجاورت چشمه پرتوزا و یا دستگاه پرتوساز فعالیت دارند در محاسبات حفاظ تعیین ضخامت وتركیب مواد بوجود آورنده حفاظ مورد نیاز جهت كاهش تندی پرتوها در نقاط معین به مقدار از پیش تعیین شده مطرح است.

لایه نیمه كننده (HVL) ضخامتی از هر ماده كه سطح انرژی تابیده شده را نصف می‌كند.

HVL تعدادی از مواد عبارت است از :

HVL          عنصر

0/95mm                Cs-137

1/2mm                  Co-60

0/6mm                  Ir-192

9/25                      H2o

میزان انرژی جذب شده را می‌توان از رابطه زیر بدست آورد.

(2-4)       

برای مثال اگر یك فوت آب برای حفاظ گذاری در مقابل پرتوهای نوترون با انرژی 60mev تعبیه شده باشد میزان انرژی جذب شده را محاسبه كنید.

شدت یك دسته پرتو رونتگن (x,γ) تك انرژی به طور نمای در عبور از یك مانع كاهش می‌یابد.

(2-5)        I=I0e-µx

در این رابطه µ ضریب كاهش خطی و xضخامت ماده می باشد.

 

 

 




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