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76 距 γ 點射源外某處之曝露率為 12 個單位,若要降至 5 個單位,假設增建因數為 1.0,則需在兩者之 間置入約多少個半值層屏蔽? (A) 2.69 (B) 1.93 (C) 1.54 (D) 1.26

71.「游離輻射防護安全標準」規定,除搶救生命外之緊急曝露人員,劑量儘可能不超過多少? (A)50毫西弗 (B) 100毫西弗 (C)250毫西弗 (D)500毫西弗

71.依據游離輻射防護安全標準,有關緊急曝露人員之劑量規定,下列何者正確? (A)為搶救生命,劑量限値為單一年劑量限度的5倍 (B)為防止嚴重危害,劑量限値為單一年劑量限度之20倍 (C)緊急曝露所接受之劑量,應與職業曝露之劑量合併記錄 (D)為減少大量集體有效劑量,劑量限値為單一劑量限度之2倍

39. 當陽離子 \( \text{Na}^+ \)、\( \text{K}^+ \)、\( \text{Rb}^+ \)、\( \text{Cs}^+ \) 在氣相中與氯離子結合形成離子對時,哪對離子形成時,釋放最大的能量? (A) NaCl (B) KCl (C) RbCl (D) CsCl

752.A driver travels along a road section where a median island or obstacle is set in the centre of the roadand sees a 'Keep Right' compliance sign. Which of the following statements is correct? (A) Vehicles mustpass to the right side of the obstacle or median island and must not enter the left side. (B) The signmerely reminds drivers of the customary right-hand traffic practice in our country; drivers may choose topass on either the left or right according to road conditions. (C) The sign indicates that the road ahead isone-way, and all vehicles may only travel in the same direction.

753.When driving on a road that has a minimum speed limit sign, which of the following is correct? (A) Adriver who drives below the minimum speed limit shall be fined. (B) Driving below the speed limit isacceptable as long as it does not affect traffic safety. (C) Driving at low speed is safer and does notconstitute a violation.