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45. According to the passage, which of the following statements is correct? (A) Pitchers are not subjects in this trend of research because of bad eye sight. (B) Findings of studies on what contribute to athletic expertise are still inconclusive. (C) The findings of the study on college baseball athletes agree with the software claim. (D) Using baseball players as subjects to examine sensorimotor skills is that they are well paid.

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複選題8.

1. 一位工人不小心打翻了 溶液，污染他的皮膚 10 cm2，污染活度為 3700 Bq，則污染 皮膚的劑量率為多少 Gy/h？ (  貝他粒子的平均能量 = 0.7 MeV，在組織之質量吸收係數為 9.18 cm2/g) (A) 6.42×(B) 1.28×(C) 6.42× (D) 1.28×

2. 一束準直良好的射束含有 105 個光子，而光子能量為 10 MeV，射束打在 20 cm 厚的碳 塊上(密度 2250 kg/m3)。10 MeV 光子與碳作用的質量衰減係數(μ/ρ)為 0.0196 cm2/g，質 量吸收係數( )為 0.0138 cm2/g。請問在碳塊裡的 10 cm 深處 1 mm 厚 (在 10.0 cm 到 10.1 cm 間) 碳層的吸收能量(MeV)？ (A) 207 (B) 876 (C) 1993 (D) 2200