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پرتوها،ایمنی و کاربرد آنها - اصول رادیوگرافی

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اصول رادیوگرافی

تاریخ:جمعه 4 شهریور 1390-10:39 ب.ظ

در آزمون رادیوگرافی جسم مورد آزمایش در مسیر پرتوهای صادره از چشمه اشعه x یا γ قرا گرفته و محیط ثبت كننده نزدیك به جسم ولی در سمت مقابل چشمه تابش قرار می‌گیرد. پرتو xو γ  را نمی‌توان مانند شعاعهای نوری كانونی كرد و از این رو، در بسیاری از موارد، تابش‌های صادر شده از چشمه در مسیری مخروطی حركت می‌كنند. برخی شعاع های تابیده شده به جسم، در آن جذب شده و گروهی دیگر بر روی فیلم ثبت شده و پس از ظهور قابل رویت خواهند بود. اگر جسم دارای عیوبی با ضریب جذب متفاوت با سایر قسمتها باشد میزان تشعشع رسیده به فیلم در مسیر عیب با نقاط اطراف آن پرتوهای گذشته از مناطق سالم را دریافت كرده‌اند متفاوت خواهد بود. و پس از ظهور تفاوت رنگ به وضوح مشخص می‌باشد.

اگر عیوب چگال تر از ماده مورد آزمایش باشند تصویر روشن تر و اگر چگالی كمتر باشند مانند حبابهای هوا تصویر تیر‌ه تر خواهد بود.




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