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Date: 5-4-2017
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Date: 18-4-2017
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Date: 5-4-2017
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Positron Radiation
Positively charged electrons are called positrons. Except for the positive charge, they are identical to beta-minus particles and interact with matter in a similar manner. Positrons are very short-lived, however, and quickly are annihilated by interaction with a negatively charged electron, producing two gammas with a combined energy (calculated below) equal to the rest mass of the positive and negative electrons.
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لشعر لامع وكثيف وصحي.. وصفة تكشف "سرا آسيويا" قديما
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كيفية الحفاظ على فرامل السيارة لضمان الأمان المثالي
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شعبة مدارس الكفيل: مخيَّم بنات العقيدة يعزِّز القيم الدينية وينمِّي مهارات اتخاذ القرار لدى المتطوِّعات
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