RT基础考试试题2.pdf

YANGZHOUHUAYUPIPEFITTINGCO.,LTD 扬州华宇管件有限公司 THEGENERALEXAMINATIONPAPEROFRTFORLEVELIIPERSONNEL RT-II基础考试题 (QUESTIONSDERIVEFORMSNT-TC-1ABOOKA) Individual’sName________________Date Score 考生姓名 日期 得分 Examiner_______________________ Hours__________ 考官 考试时间 1.A monochromaticX-raybeam is: 单色X射线束: a.a narrowbeamusedto producehigh-contrastradiographs 用来产生高对比度射线照片的窄射线束 b.also referredtoasa heterogeneousX-raybeam 也叫做多频X射线束 c.a beamcontainingonly characteristicX-radiation 是只含有标识射线束 d.a beamconsistingof asinglewavelength 是由单一波长射线组成的X射线束 2.ThevelocityofelectronsstrikingthetargetinanX-raytubeisa function ofthe: X射线管中,轰击靶的电子运动速度取决于: a.atomic numberofthe cathode material 阴极材料的原子序数 b.atomic numberofthe filamentmaterial 灯丝材料的原子序数 c.voltage differencebetween thecathodeandanode 阴极和阳极之间的电位差 d.current flowintherectifier circuit 整流电路的电流 3.Theslopeofastraightlinejoiningtwopointsofspecifieddensities on acharacteristiccurve ofafilmisknownasthe: 胶片特性曲线上,通过两个特定密度点的直线的斜度叫做: a.Speed ofthecurve 曲线的速度 b.Latitude 宽容度 c.Average gradient 平均梯度 d.Density 密度 4.ThinsheetsofleadfoilinintimatecontactwithX-rayfilmduring exposure increasefilm densitybecauseThey: 曝光过程中,与X射线胶片紧密接触的铅箔屏可提高胶片黑度,其原因是: a.fluoresce andemitvisible lightwhichhelpsexposethefilm. 铅箔屏会发荧光和可见光,从而加速胶片感光 b.absorb thescattered radiation 铅箔可吸收散射线 c.prevent backscatteredradiationfromfoggingthefilm. 防止背散射造成胶片灰雾 d.emit electronswhenexposed toX-andgammaradiationwhichhelp darken thefilm. 铅箔受X射线和γ射线照射时发射电子,从而有助于胶片黑化. 5.Theprimaryformofenergyconversionwhenelectronsstrikeatarget in anX-raytuberesults inthe productionof: X射线管中,电子轰击靶时能量转换的主要形式是产生: a.primary X-rays 一次X射线 b.sceonda