This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Name Evie/Li“ "5 lnclass assignment # 1 l.‘ You are given ten (10) dice to roll (the dice are sixsided 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? [xiH ibinom'uai yinkibdxhh SMCQ i327; P(3(5"’:} Px(i'_PJﬂX W 4:70) P:1X‘:3 Urist)!“ 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
nclass assignment # 3 1.. Draw a rough sketch below of an Xray 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) gasfilled
(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 zaxis (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 431 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'F18 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
Iiiclass 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 Co60 9’ 50 Which of the following treatment units would have the most
penetrating radiation for treating a deep tumour? a. (To60 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 Xray 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: ;; xii5+“ 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‘SOCQMi‘f'i (it"s \ .
m w _ , _ 0W 2 ~23 “7mg :3 6:3» @ﬁiivixluvti‘SﬁuﬁwOi 3.0%
(1200?; )LE)[email protected]‘ié§’)(‘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 twoﬁeld treatment. What is
the most likely hinge angle for this approach? o '
a. 30° {9‘ €20 ”7?
b” 600 ‘ j Z
c. 75° ~~> Brig7a”;
@1200 2. .3 392%06 2.3 (@5426; ...
View
Full Document
 Fall '11
 pejovicmilic

Click to edit the document details