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ট্রিফয়েল কি?

Md. Saifur Rahman

তেজস্ক্রিয় রশ্মি চিহ্নকে ট্রিফয়েল বলা হয়। এটি দ্বারা অতিরিক্ত ক্ষতিকর আলোক রশ্মিকে বোঝানো হয়।

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