פחמן-11

פחמן-11
כללי
סמל 11C
נייטרונים 5
פרוטונים 6
מידע גרעיני
זמן מחצית חיים 20.364 ± 0.014 דקות
איזוטופ אב חנקן-14
תוצרי דעיכה בור-11
מסה איזוטופית 11.0114326 u
ספין -3/2
עודף אנרגיה 10,649.40 ± 0.06 KeV
אנרגיית קשר 6,676.456 ± 0.005 KeV
מצב רדיואקטיבי ואנרגיה רדיואקטיבית
β+ 0.960211 MeV
ε 1.98 MeV
מערך הדעיכה של 11C

פחמן-11 או 11C הוא איזוטופ רדיואקטיבי של פחמן שגרעינו מכיל 6 פרוטונים ו-5 נייטרונים. האיזוטופ התגלה בשנת 1934. [1]

פחמן-11 הוא רדיו-איזוטופ שדועך לבור-11. ב-99.77% עד 99.81% מהמקרים עובר דעיכת β+ לפי התגובה הבאה:

וב-0.19% עד 0.23% מהמקרים יעבור לכידת אלקטרון לפי התגובה הבאה:

פחמן-11 נוצר בתהליך האצת פרוטונים בציקלוטרון אל תוך חנקן-14 לפי התגובה הבאה:

השימוש בפחמן-11 כרדיו-איזוטופ להדבקה רדיואקטיבית של מולקולות ב-PET נפוץ מאוד.

ראו גם

הערות שוליים

  1. ^ Live Chart of Nuclides, nds.iaea, ‏31 במרץ 2004 (באנגלית)
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