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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

30. γ-射線與 X-射線對生物體造成的輻射性傷害是肇因於下述何種情形? (A) 發生游離現象並產生自由基 (free radicals) (B) 產生同位素 (C) 發生氧化反應 (D) 發生還原反應

734.A driver sees an orange-background 'Detour Direction' sign ahead while driving. Which of the followingstatements is correct? (A) It is a permanently installed compliance sign indicating the road haspermanently changed its traffic direction. (B) It is a temporary construction sign indicating roadconstruction ahead; drivers must detour in the direction of the arrow. (C) It is an advisory sign; driversmay decide for themselves whether to detour.

735.When a small vehicle is traveling on a freeway or expressway and does not impede traffic flow, it maytravel at the maximum speed limit of that road section in the overtaking lane. Which of the following is theovertaking lane on a freeway or expressway? (A) The innermost lane. (B) The outermost lane. (C) Themiddle lane.