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quiz - Name Evie/Li“"5 ln-class assignment 1 l.‘...

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Unformatted text preview: Name Evie/Li“ "5 ln-class assignment # 1 l.‘ You are given ten (10) dice to roll (the dice are six-sided ones). What is the probability that exactly three (3) of them will come up with the number one? Give your answer to three significant figures [4 marks] P: /Q +0 re“ Hui nmbu‘ in corn" jim‘bfiai m5? [xi-H ibinom'uai yinkibdxhh SMCQ i327; P(3(5"’:} Px(i'_PJfl-X W 4:70) P:1X‘:3 Uri-st)!“ F63): fl “5(2): I20(5/.‘6276on'y‘ag‘fiegj 3H3! _. (27(3): 0455’ (or £15570) Multiple choice: 2 marks each” .i .i 2.‘ Heavy radioactive nuclei (A > 200) most frequently decay with the emission of a(n): @dpha particle (b) beta particle (c) gamma ray (d) conversion electron 3H The first Nobel Prize in Physics was awarded to: .Wilhelrn Roentgen (b) Henri Becquerel (0) Marie Curie ((1) Pierre Curie (e) Becquerel, Curie, and Curie Name Sci orix‘ofij ss assignment # 2 Consider a (Is—137 source that emits a gamma ray of 662 keV. The photon _ racts with an electron from an atom of lead and Compton scatters Zidi'rectly back towards the source. How much energy will the scattered "sphoton have? [4 marks] Give your answer to 3 significant digits. @ Multiple choice: 2 marks each. .. .. 1. Suppose an exposure rate of 50. mR/hour is measured a distance of 1.0 m from a source of radiation. Where will the exposure rate be 2.0 mR/hour? MW Sip/1M law (a) 25 m from source ' . _ l 6 m 2' (b) 20 m from source E : OM52 ,3 fiinfifii Mn 21;) (c) 15 m from source x5 2..; Q i} MR)“ @0 m from source y (e) 2.0 m from source 0‘82 a CQSJQS mlz n5 (,1: ”"2 5.90 M 2.. Which of the following absorbed doses is most likely to cause a biological effect? (a) 0.5 Gy Mat smear (b) 45 rads w? “YR M- $6me 0A 55 CG)! A “‘5 Bfiot enough information provided 8““ 47134 ‘3‘: i“: i“ an ‘9 w" "I‘IéSLL.L i Frail radii Name Soim‘i‘lOAS n-class assignment # 3 1.. Draw a rough sketch below of an X-ray energy spectrum for a tube operated at 100 kVp. Include characteristic X—rays at 70 keV. [2 marks] 10 wok/5V Ema“; Chen!) 2. Now, what would the spectrum look like ifthe kVp was reduced to 80 kVp? [1 mark] ' a xwgr "Po Ema? (kt—V) 3. Finally, and still with 80 kVp, sketch the spectrum if 2 mm Al filtration was added in to the beam. [1 mark] ’79 70 av) Multiple choice: 2 marks each. . .. Eurgjt l. The CT (or Hounsfield) number for a certain region of muscle is 50.. This would mean the linear attenuation coefficient of this tissue is greater than that for water by .. CT# 2. 2 000 [4* iii“? Ea) 2.5 % the b) 0/0 SD ‘: f/L Run/A (c)25.% 195° H.o .. ....‘-.. (d) 50 % _ . fl 1 «a "TNT“ ‘9 Gas/Aliza: 1/4 ~/"lH2:n I 2. This type of‘radiation detector is characterized by its excel resolution, linear response, and good detection efficiency. muslin—.— ent energy (a) gas-filled (b scintillation emiconductor Name gO/mi‘i 6* A] . n~class assignment # 4 1‘. Consider a small segment of muscle tissue being imaged by a 005 T lVIRl system“ If'the net magnetization vector along the z-axis (MZ) was initially zero, how long would it take for the net magnetization vector to reach 80% of its thermal equilibrium value (M0)? [4 marks] You will need to use Table 43-1 on page 387 ofWolbarst from the course pack“ (Let me know if you do not have your course pack)“ . at _ ME=Mo(l"€ /H) was: T1: 550 m; to? IWSCQ, 63.5“?" sell. it {‘13: ogre L-— a 55W» Mb Hagen: H one = e _ ladle“ .77:— aifggslsms 550m: Multiple choice: 2 marks each. i. .5 1‘. For nuclear medicine applications, which of the following is n_ot a feature ofthe NaI detectors used in a “Gamma Camera”? @113 excellent energy resolution b.. high detection efficiency c large detection area d‘. is a type ofscintillation detector 2.‘ A PET scanner receives coincident. radiation detections resulting from the decay of'F-18 within a patient“ If one of the detectors records an energy of 5 11 keV, what should be the energy recorded by the other detector (1 80° opposite)? [‘95 S'EW“€L2C‘LF®N avuk‘ilkilqi; 0A a" nearly 0 keV ~ Lies w u it s . helm; @ 511 keV W 0 ’5 e y c.‘ 1022 keV Name M Iii-class assignment # 5 ' 1.. You are operating a linear accelerator at a source to skin distance (S SD) of90‘cm, a treatment depth of'8..0 cm, and an SDD of 20‘. cm.‘ If'you Wish to have a geometric penumbra no larger than 1.0 cm across at the treatment depth, how small must your effective radiation source be? [4 marks] peawmua= amm_[SSb+wl~sz) ' sag W) mem 5. LOCM SSbflrfime all $00M Shb‘lZOC/m 1.0% 4'2, 88mm (70wl‘3vf570m’30m) 2.0% Multiple choice: 2 marks each“ .. a. .43 {88W i O 2!; cm / 1.. Which of the following would have the highest value of LET? “‘5 . Alpha particle beam Proton beam c.‘ Electron beam fiom linac d“ X—ray beam from linac Gamma ray beam from Co-60 9’ 50 Which of the following treatment units would have the most penetrating radiation for treating a deep tumour? a. (To-60 machine b.. Orthovoltage unit 6 MV linac @10 MV linac Name SO/i/i it'll/0‘ 'In—class assignment # 6 Consider a single field photon beam radiation treatment to isocentre (SAD = 100 cm). Source to skin distance is 92 cm. Dose Calculation [4 marks] .lf'a 6 MV linear accelerator X-ray beam is used for exactly 120 monitor units, What will be the dose to the tumour? The field size is 6 cm X 12. cm as measured at isocentre. K is given as 1.00 rads/MU, and the total scatter factor (SC X Sp) is 0.968.. A TMR table for the machine is given on the reverse ofthis page. The linac output was originally calibrated at exactly 100 cm. WW '7 55er 010% Here) R‘elol r‘rk (2:lean .. ,fl _ 3. - “,1: ;;- xii-5+“ 2 FCYLLH‘s M ezu‘worlofli~ azmm_ me ~ ”1,1 3 X Seem OJ L» RX RXSCX P (Sen-«rm -c;Lxr'.s oint- Sgfi cm C Tabla $2 cuf‘ [29: I‘SOCQ-Mi‘f'i (it"s \ . m w _ , _ 0W 2 ~23 “7mg :3 6:3» @fiiivixluvti‘SfiufiwOi 3.0% (1200?; )LE)[email protected]‘i駒)(‘fw6;1) 0+ tiff lk all“ l®9an~~72m =Fwn - .. — . r r ”“3! 5mm clam 2 95»? mil _ am 3.93 W *9 TM? '= 0-?2i Multiple choice [2 marks each]: 1. Which of the f'olloWing is n_ot likely to be tabulated when considering linear accelerator treatments? a. PDD CE: TAR c. TMR d. TPR 2. A wedge angle of30° is introduced for a two-field treatment. What is the most likely hinge angle for this approach? o ' a. 30° {9‘ €20 ”7? b” 600 ‘ j Z c. 75° ~~> Brig-7a”; @1200 2. .3 392%06 2.3 (@5426; ...
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