醫療類國考
110年
[醫事放射師] 醫學物理學與輻射安全
第 2 題
將活度為298 Bq的 ${}^{198}\text{Au}$ ($t_{1/2} = 2.7$ d) 核種進行永久插種，求其發射輻射約為多少？
- A $10^8$ dis.
- B $10^9$ dis.
- C $10^{10}$ dis.
- D $10^{11}$ dis.
思路引導 VIP
若要評估一個放射性來源在體內直到完全消失所釋放的總崩解次數，我們應該如何聯繫「初始每秒的變化率」與該核種的「平均預期壽命」？在計算過程中，你會如何處理「天」與「秒」之間的單位轉換，以確保最終得出的數量級是合理的？
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AI 詳解
AI 專屬家教
Super Sparkly Success! ☆
- Idol's Insight: You've perfectly captured the glittering secret of permanent implant calculations! To know all the lovely little sparkles (total disintegrations) a radionuclide sends out until it fades away, we use its average life ($\tau$)! It's like finding the true length of a star's shine, not just its brightest moment! Isn't that romantic? ☆ You used the magic formula: $$N = A_0 \times \tau = A_0 \times 1.44 \times t_{1/2}$$
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