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Compre Possible Questions Flashcards

1
Q
  1. If the total exposure allowed/ day
A

Allowed= 0.2Sv
Allowed/hr = 8hrs/day
0.025mSv
=0.2/8

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2
Q
  1. Dose required permanent sterility for female
A

500rad

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3
Q

Leading international organization

A

ICRP

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4
Q

Dose received by radiation workers except:

A

coulomb/kg

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5
Q

A patient exposed to pelvis examination

A

2rad- 2 x a (alpha)
2 x 20= 40mSv/rem

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6
Q

Dose limit for patient

A

D=K/kg ; D= e/m

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7
Q

Calculation for kerma involves the ff:

A

energy fluence, energy, energy mass 12.3

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8
Q

For general leakage radiation allowed at 1m

A

100mR/h

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9
Q

Ff. devices work under principle of luminescence-

A

TLD & OSL

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10
Q
  1. Added to the filling of Geiger-Muller agent
A

quenching agent; xenon*if common ang question

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11
Q
  1. During fluoroscopy the TLD is placed at-
A

collar, above level apron

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12
Q
  1. Amount of scattered radiation directly proportional except
A

collimation

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13
Q
  1. During pregnancy, required # of monitors-
A

2; 1 collar, 1 fetus

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14
Q
  1. Film badge material
A

aluminum & copper

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15
Q
  1. As a useful, most common used thickness have approx.
A

0.5mm

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16
Q
  1. TLD filter
A

aluminum & copper

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17
Q
  1. Most commonly used OSL crystal
A

aluminum oxide

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18
Q
  1. Film badge measures radiation dose except
A

alpha

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19
Q
  1. Level collar, outside lead apron
A

participant

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20
Q
  1. Where film badge is submitted-
A

PNRI

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21
Q
  1. When a radtech changes employment, what happens to his/her exposure history-
A

transfer; B

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22
Q
  1. Which of the ff. has highest effective dose-
A

barium enema

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23
Q
  1. A general public; infrequent
A

5mSv

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24
Q
  1. Ff. monitor provide permanent record-
A

film badge

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25
Q
  1. NRCP recommend a distance of __ to stand
26
Q
  1. Shrinkage of an organ-
27
Q
  1. Ingested (background rad)
28
Q
  1. How many % lead apron
A

99% attenuation

29
Q
  1. 95% of occupational dose obtained
A

mobile &fluoroscopy

30
Q
  1. Ensure maximum instrument calibrated at least:
A

annually; filmbadge- 1 month

31
Q
  1. Types of apron at pregnancy
A

wrap around

32
Q
  1. Proper collimation contribute to:
A

(A & B; increasing image contrast & reduce patient dose

33
Q
  1. Which of the ff. are the features of fluoroscopic equipment-
A

protective curtain, filtration-2.5, collimation

34
Q
  1. Lead is the most common shielding material due to the ff. reasons
A

high atomic #, high density; 1&2

35
Q
  1. Who is the person in the hospital responsible for radiation sources
A

radiation safety officer; D

36
Q
  1. Area required for shielding
A

fully occupied adjacent area

37
Q
  1. Most common.. in cell
    orming reactive free radicals
    instruments should be calibrated annualy
A

radiolysis in water; B

38
Q
  1. Ff. are the methods in radiation exposure control & diagnostic therapeutic radiology-
39
Q
  1. Materials used to substitute lead-
40
Q

the most common thickness of lead used as lead apron.

41
Q

• Minimum dimension of xray room with radiographic table

A

3.5 m x 4.0 m

42
Q

• Radiation level measurements at the other side of the walls and door/s shall not exceed

43
Q

length of time that the machine is turned on

A

• Use factor

44
Q

are Developing an appropriate radiation safety program and maintaining radiation monitoring records for all personnel

A

radiation safety officer (RSO)

45
Q

amount of dose delivered per unit time

A

• Exposure rate

46
Q

Is the cause of multiple scan average doses (MSAD) to increase

A

• Overlapping slices

47
Q

is the most useful tool for comparing radiation doses among different protocols

A

• CTDI VOLUME

48
Q

• 131 GBq of F-18 during a 2 h irradiation

49
Q

• 370 MBq (10 mCi) of

A

F-18 FDG- 7 mSv

50
Q

• limit the Mo-99 contamination

51
Q

• walls in the x-ray examination room shall be made of at least _____ poured concrete and at least_____ thickness of properly filled concrete hollow blocks and cement plaster.

A

15 cm; 20 cm

52
Q

or transportable x-ray facility, x-ray examination room should be at least _____ and only upright chest x-ray examinations shall be allowed.

A

1.0 m x 2.0 m

53
Q

A dose equivalent at a tissue depth of 1 cm

A

• Deep dose equivalence

54
Q

Annual shallow dose equivalent

A

• 500 mSv

55
Q

should be stored in or adjacent to a radiation area

A

• control monitor

56
Q

• Common problems with dosimetry associated with falsely low radiation exposure is when____

A

people are not wearing dosimeters when working with radiation source.

57
Q

Refers to the distance to the adjacent occupied area In the calculation of barrier thickness

A

• distance factor

58
Q

• input phosphor of the image intensifier is positioned___

A

35 cm above table top

59
Q

ESE for Chest PA X-ray in modern radiography

A

• 0.01 mGy

60
Q

most significant source of background radiation that is from ingestion

61
Q

Pb attenuates 99% of secondary radiation

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