606 Applications of Nuclear PhysicsSection 45.7Uses of RadiationP45.34The initial specific activity of 59Fe in the steel,Rmbg04620 00200kg1003 70 101370 10==×FHGIKJ=×....µµµCiCikgBqCiBq kg.After 1 000 h,RmRmeet=FHGIKJ=×−−×−−06640 10100063 70 101 95 1041λ...Bq kgBq kgh hej.The activity of the oil,RoilBq liter50 litersBq=FHGIKJ=80060 06867.(.)..Therefore,mRin oiloil7 BqBq kgkg×−86195 10445 1065....So that wear rate is5.×−−kg1000 h4.45 10kg h8.P45.35The half-life of 14O is 70.6 s, so the decay constant is =−lnln..2270 600098212Tss1.The 14O nuclei remaining after five min is NNeet=×−−−0103008105 26 10af..s s1.The number of these in one cubic centimeter of blood is′=FHGIKJFHGIKJ100526 102000263 1085....cmtotal vol. of bloodcmcm333and their activity isRN=′=×=×−0 009 822 63 102 58 1010533.sBq ~Bq1ej.P45.36(a)The number of photons is 10104962 1043MeVMeV... Since only 50% of the photons aredetected, the number of 65Cu nuclei decaying is twice this value, or 1 92 104.×. In two half-lives, three-fourths of the original nuclei decay, so
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This note was uploaded on 12/15/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .