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Radiographic InterpretationCoursework 1

Answer all questions

! W"i#" o$ t"e $ollowin% isoto&es "as t"e lon%est "al$'li$e(

a Co)alt *+ ) Iri,iu- !./# Ytter)iu- !*., Seleniu- 01

/ T"e "al$'li$e o$ an isoto&e is ,e&en,ent u&on2

a T"e sour#e to $il- ,istan#e ) T"e initial intensit3 o$ t"e isoto&e# T"e &"3si#al si4e o$ t"e isoto&e, T"e isoto&e t3&ee All o$ t"e a)o5e

6 I$ an e7&osure ti-e o$ / -inutes were ne#essar3 usin% a 6 -etre sour#e'to'$il- ,istan#e$or a &arti#ular e7&osure8 w"at ti-e woul, )e ne#essar3 i$ a * -etre sour#e'to'$il-,istan#e is use, an, all ot"er 5aria)les re-ain t"e sa-e(

a !/ -inutes ) 9 -inutes# : -inutes, * -inutes

9 I$ we start wit" 1+ #uries o$ Co*+8 w"at will t"e a#ti5it3 )e at t"e en, o$ !1 . 3ears(

a !/ 1 #uries ) * /1 #uries# 6 !/1 #uries, ! 01 #uries

1 T"e nu-)er *+ in #o)alt *+ is2

a T"e nu-)er o$ neutrons a,,e, to t"e nu-)er o$ &rotons ) T"e nu-)er o$ neutrons onl3# T"e nu-)er o$ &rotons onl3, Di#tates t"e ele-ent t3&e

!

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* Ytter)iu- !*. is a %a--a sour#e w"i#"2

a ;ro,u#es relati5el3 %oo, qualit3 ra,io%ra&"s at t"e #orre#t e7&osure w"en #o-&are,wit" ra,io%ra&"s &ro,u#e, wit" Ir!./

) ;ro,u#es 5er3 s"ort wa5e len%t" ra,iation# Is %enerall3 use, a -aterials o5er 6+ -- in t"i#

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# ;lat la-inations8 la#< o$ inter run $usion usin% t"e MIG MAG wel,in% &ro#ess an,

#a& o5erla&, All ,e$e#ts are alwa3s ,ete#te, usin% 7'ra3s

!/ W"i#" o$ t"e $ollowin% is t"e -ost li

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a Co*+

) Ir!./# Y)!*., T-!0+

!: Col, la& in a wel, is a #o--onl3 use, ,e$inition $or w"i#" o$ t"e $ollowin%(

a @n,er#ut ) H3,ro%en #ra#

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# Ele#trons

, ;ositrons

/. W"i#" o$ t"e $ollowin% units is use, $or -easurin% t"e a-ount o$ a)sor)e, ,ose(

a Sie5ert ) Re-# Roent%en, Gra3

6+ T"e &enetratin% a)ilit3 o$ an 7'ra3 )ea- is %o5erne, )32

a T"e intensit3 o$ t"e )ea- ) T"e wa5e len%t" o$ t"e )ea-# T"e t"i#