רנטגן (יחידת מידה)

רנטגן הוא יחידת מידה (מסומנת ב-R) המשמשת למדידת קרינה מייננת. היחידה קרויה על שמו של וילהלם רנטגן. היחידה מוגדרת ככמות הקרינה הדרושה לשחרור מטענים חיוביים ושליליים בגודל של יחידה אחת של מטען אלקטרוסטטי בסמ"ק אחד של אוויר, בתנאים סטנדרטיים של טמפרטורה ולחץ (STP) - כלומר, 101.3 קילו פסקל, ו- 0°C. כמות קרינה זו משחררת כ- 109×2.08 זוגות יונים.

במערכת היחידות הבינלאומית, רנטגן אחד שקול ל-1R = 2.58×10−4 C/kg. כמות של 500 רנטגן ב-5 שעות היא קטלנית לבני אדם. בלחץ אטמוספירי סטנדרטי (צפיפות האוויר ~ 1.293 ק"ג למטר מעוקב).

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