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General Examination Paper For ASME RT Level Ⅱ ASME RT-Ⅱ级基础试题 Filled in by the trainee: 下列各项由参加基础考试人填写: Name: Date: 姓名: 考试日期: Filled in by the evaluator: 下列各项由参加评分人填写: Score: Evaluator : 得分: 评分人姓名: Draw a circle on a corrective answer: 圈出正确的答案: I. Physics (3marks a question, tot.24 marks) 物理(8题,每题3分,共24分) 1. The primaryform of energy conversion when electrons strike a target in an X-ray tuberesults in the production of: X射线管中电子轰出阳极靶时能量转换的主要形式是产生: A. primary X-rays; B. secondary X-rays; 一次X射线;二次X射线; C. short wavelength X-ray; D. heat; 短波长X射线;热 2. Theabsorption of radiation by a material varies: 材料对射线的吸引遵循什么规律? A. directlywith the square of the distance from the source. 与材料离射源距离的平方成正比; B. Directlywith the thickness of the material. 与材料厚度成正比; C. Inverselywith the amount of scattering in the material. 与材料中散射线量成反比; D. In anapproximately exponential manner with the thickness of the material. 与材料厚度大致按指数律变化; 3.The radiographic absorption of amaterial will tend to become less dependent upon the composition of thematerial when: 在什么情况下,一种材料对射线的吸收,有与材料成分关系不大的趋向? A. thekilovoltage is increased. 管电压提高时; B. Thesource-to-film distance is decreased. 焦距缩短时; C. Thekilovotage is decreased. 管电压降低时; D. A filter isused
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