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General Examination Paper For ASME RT Level Ⅱ ASME RT-Ⅱ級基礎(chǔ)試題 Filled in by the trainee: 下列各項(xiàng)由參加基礎(chǔ)考試人填寫: Name: Date: 姓名: 考試日期: Filled in by the evaluator: 下列各項(xiàng)由參加評分人填寫: Score: Evaluator : 得分: 評分人姓名: Draw a circle on a corrective answer: 圈出正確的答案: I. Physics (3marks a question, tot.24 marks) 物理(8題,每題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射線管中電子轟出陽極靶時能量轉(zhuǎn)換的主要形式是產(chǎn)生: A. primary X-rays; B. secondary X-rays; 一次X射線;二次X射線; C. short wavelength X-ray; D. heat; 短波長X射線;熱 2. Theabsorption of radiation by a material varies: 材料對射線的吸引遵循什么規(guī)律? A. directlywith the square of the distance from the source. 與材料離射源距離的平方成正比; B. Directlywith the thickness of the material. 與材料厚度成正比; C. Inverselywith the amount of scattering in the material. 與材料中散射線量成反比; D. In anapproximately exponential manner with the thickness of the material. 與材料厚度大致按指數(shù)律變化; 3.The radiographic absorption of amaterial will tend to become less dependent upon the composition of thematerial when: 在什么情況下,一種材料對射線的吸收,有與材料成分關(guān)系不大的趨向? A. thekilovoltage is increased. 管電壓提高時; B. Thesource-to-film distance is decreased. 焦距縮短時; C. Thekilovotage is decreased. 管電壓降低時; D. A filter isused
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