CLUSTER 1
問題一覧
1
The Bucky slot cover is in place to protect the
1. Patient
2. Radiologist
3. Radiologic Technologist
2 only
2
Used chemical bottles can be recycled:
Always False
3
For testing white light leaks, frequency of test is done every
1. Week
2. Month
3. 6 months
4. As needed
3 & 4 only
4
When testing for white light leaks, you are recommended to stay inside the darkroom for minutes while the safelight is switched off?
10
5
The recommended distance of facing down safelight from the working bench is approximately cm.
130 cm
6
Which of the following are used to check for focal spot size?
1.Star pattern
2.Pinhole camera
3.Slit camera
4. Wire mesh
1,2 & 3 only
7
Which among the following is the most accurate way to test for focal spot size?
1.Star Test pattern
2.Pinhole camera
3.Slit camera
4.Wire mesh
2 only
8
Which of the following are used to test for kVp accuracy?
1. Wisconsin cassette
2. Sussex cassette
3. Ardran-Crookes
1,2 & 3
9
The accepted tolerance level for collimation is ±____ % SID
2
10
The accepted tolerance level for exposure linearity % ____ > 10ms
10
11
The minimum HVL required for 3 phase/high frequency units using 70kVp is about mmAl,
2.0
12
AEC ion sensitivity chambers have to be sensitive within +/- ___ % in the same areas.
10
13
What should be used to examine areas that have poor detail?
Wire mesh test
14
For x-ray/light beam alignment, which of the following is/are used?
1. 8 coins
2. 4 Paper clips
3. Lead markers
4. Star test
1,2 & 3 only
15
Exposure reproducibility should be maintained within ‡ %
5
16
Being a radiation worker, the expected days of life lost is
12 days
17
Acute radiation lethality follows a response relationship.
Nonlinear, threshold
18
During this period, the person is free of visible effects.
Latent
19
The Mean Survival Time (MST) for Gl syndrome is days
4-10
20
What is the minimum threshold dose for death to occur for a whole-body exposure?
200 rad
21
A pregnant radiographer must have how many ersonnel monitoring device?
2
22
The following are the established protocol for radiography of the pregnant patient, EXCEPT:
All are correct
23
Radiation are categorized as to primary and secondary radiation. Which of these is considered a primary radiation?
X-rays from the tube towards the patient in forward direction
24
It is the most critical, target molecule in the body that serves as the command and control for cell function.
DNA
25
The following are considered as deterministic effects of radiation exposure, except:
genetic effects
26
The following describe stochastic effects EXCEPT:
dependent of radiation dose
27
The division wherein the nucleus swells and the DNA becomes more prominent:
prophase
28
The breakdown of protein metabolism produces:
amino acids
29
The powerhouse of the cell:
mitochondria
30
Weekly MPD for occupational exposed persons:
100 mrem
31
If the quality factor (QF) of ionizing radiation is higher, relative biological effectiveness:
is also higher
32
30. A film badge monitoring device used for monitoring of personnel can:
1. record the image of the aluminum or copper filters which are contained in the plastic holder
2. be compared with a control badge by the monitoring company
3. record doses below 10 millirem
1 & 2 only
33
Application/s of radiation dose - response relationship:
both
34
The sequence of events following high - level radiation exposure leading to death within days or weeks is called the:
acute radiation syndrome
35
The technologist has considerable control over both image quality and patient dose, depending on which materials or methods are selected for each examination. One technique that reduces patient dose and improve image quality at the same time, day is:
collimating to the area of clinical interest
36
Cardinal principles of radiation protection:
1. time
2. distance
3. sheilding
1,2 & 3
37
Which of the following statement correctly describes the predicting aspect of the latent period?
the duration of the latent period is an indicator of the severity of effects to come
38
Within few months after x - ray was discovered they were being used for medical diagnosis and treatment, resulting in the first visible biologic effects of radiation on humans. Which of the following is an immediate or early effect of radiation?
skin erythema
39
Sources of unnecessary exposure:
1. annual chest radiograph
2. routine fluoroscopy in person older than 40 years
3. mammography examination in high risk female
1,2
40
In the early 1900's, Bergonie and Tribondeau formulated some theories about the radiosensitivity of biologic tissue. The Law of Bergonie and Tribondeau formulated in part that:
when metabolic activity is high, radiosensitivity is high
41
The target theory is a concept for classifying radiation effects in the cellular level. The basis of this theory is that in every cell there is a significant target, if rendered nonfunctional will result in death of cell. Which of the following is that most important molecular target?
DNA
42
The aluminum filtration reduces patient dose by:
removing the longer - wavelength photon from the beam
43
The shielding of a typical x-ray room is:
1/16 inch of lead - 2.5mm of lead
44
Which of the following has the greater shielding value?
2 Tenth Value Layers (TVLs)
45
Thermoluminescent dosimeters:
AOTA
46
The most means of reducing patient exposure:
distance
47
Based form the principle of radiation protection under Distance, when the distance is doubled, the intensity is:
decrease 1⁄4 its original value
48
In mobile radiography, the radiographer should:
1. Stand at least 6 ft from the source
2. Stand behind a corner, if possible
3. Use low kVp techniques
1 & 2 only
49
Barrier classification which includes all the different protective apparels:
secondary barrier
50
Which of the following group of people have higher dose limits?
radiation workers
51
A sun-burn like reddening of the skin resulting to long exposure to radiation
erythema
52
What is the minimum equivalent of total filtration required for diagnostic x-ray operating above 70 kVp?
2.5 mm
53
What term is used to describe radiation damage that increases the probability of including a late effect but will not increase the severity of the effect (ex. Carcinogenesis, life shortening)?
stochastic
54
How many half - value layers of filtration must be added to the primary beam to reduce its intensity to approx 3% of its original value?
5
55
It results from maintaining the anode at elevated temperatures for prolonged periods.
long exposure time
56
It is the unit of energy used to measure the heat capacity of the x-ray tube/unit.
head units
57
High frequency generator is recommended rather than high voltage generator because of the following reasons EXCEPT:
low cost
58
For what purpose is there a negative electrical charge on the focusing cup?
to draw the electrons together into a stream
59
The function of x-ray tube rating chart
Correct exposure factors for radiographic exam.
60
Rectification used:
Convert AC to pulsating DC
61
Part of Cathode assembly
1. Filament
2. Target
3. Focusing cup
1 & 3
62
Material added to tungsten for construction of a long-lasting filament
thorium
63
The flow of one coulomb per sec in a conductor is equivalent to one
ampere
64
mAs is a unit of
charge
65
How much of Tc-99 m will remain after 4 physical half-life if the initial activity was 2 mCi?
125 uci
66
The radiographic exposure is made at 500 mA; 100 ms the equivalent mAs is?
50 mAs
67
One disintegration per second of activity is equal to.
1 Bq
68
The number of Half lives required to reduce the activity to 1/32 of the original amount
5
69
Which among these following interaction where ionization occurs
compton scaterring
70
Among the following interactions, which of these does not produce scattered x-ray?
Photoelectric Effect
71
its purpose is to absorb soft x rays and improves the quality of the x ray beam
filter
72
Pair production produces all of the following except:
proton
73
At 100 kVp approximately how many % of bremsstrahlung x ray is produced?
85%
74
A process where an unstable nuclei spontaneously emits radiation to reach a stable state.
radioactive decay
75
Tc 99-, has initial activity of 50mCi after its activity will be 25mCi.
6 hrs
76
The maximum no. of electrons in the n-shell is?
32
77
Refers to the particle that have lower range
alpha
78
The transition of an outer orbital electron to an inner orbital shell produces?
characteristic x-ray
79
The fundamental unit of the electromagnetic radiation
photon
80
When fast moving electrons interacts at the nuclear source of a target material its kinetic energy is converted to?
bermsstrahlung
81
One coulomb of electron charge is equivalent to how many electrons?
6.25 x 10^18
82
The equivalent value of 1mCi in Bq is
37 Mbq
83
For resistor of 5 ohms, 10 ohms, 15 ohms and 20 ohms are connected in a series circuit. Determine the unknown values describe in number 84-87 if the circuit draw 110 volts from an AC source.
The total resistance is?
50
84
For resistor of 5 ohms, 10 ohms, 15 ohms and 20 ohms are connected in a series circuit. Determine the unknown values describe in number 84-87 if the circuit draw 110 volts from an AC source.
The total current is?
0.22 amps
85
For resistor of 5 ohms, 10 ohms, 15 ohms and 20 ohms are connected in a series circuit. Determine the unknown values describe in number 84-87 if the circuit draw 110 volts from an AC source.
If the four resistors are connected in a parallel circuit, what is the total resistance?
2.4 ohms
86
For resistor of 5 ohms, 10 ohms, 15 ohms and 20 ohms are connected in a series circuit. Determine the unknown values describe in number 84-87 if the circuit draw 110 volts from an AC source.
The power generated in the circuit is _____ watt?
242
87
Which one of the ff components of the diagnostic x-ray tube is on the positive side of the tube?
stator
88
A stationary anode will most likely used in which of the following
dentistry
89
Which of the following is not a function of the anode?
thermionic emission
90
A fluoroscopic examination at 85 kVp at 4mA, single phase requires a 4mins the number of anode heat units produced would be approximately?
81,600
91
The x-ray emission spectrum principally depends on which of the following
2
92
Normally the x-ray emission spectrum contains?
Both characteristic and Bremsstrahlung
93
The characteristics x-ray emission spectrum principally depends on which of the following?
target material
94
The continuous x-ray emission principally depend on which of the following
target material
95
The x ray emission spectrum represents
X-rays emitted from x-ray tube
96
The formula for heat unit in a single phase high voltage generator is?
kVpxmAxs
97
When the mAs is increased the x-ray quantity?
Increase proportionately
98
The heel effect most likely to increase when reducing the;
field size
99
In general xray quantity will increase with?
increase kVp
100
The thickness of the material required to reduce the intensity of the beam to 1⁄2 of its original value
HVL
CLUSTE 1
CLUSTE 1
GAJE, Harvey Jay M. · 75問 · 2年前CLUSTE 1
CLUSTE 1
75問 • 2年前CLUSTER 2
CLUSTER 2
GAJE, Harvey Jay M. · 12問 · 2年前CLUSTER 2
CLUSTER 2
12問 • 2年前CLUSTER 3
CLUSTER 3
GAJE, Harvey Jay M. · 100問 · 2年前CLUSTER 3
CLUSTER 3
100問 • 2年前CLUSTER 3
CLUSTER 3
GAJE, Harvey Jay M. · 79問 · 2年前CLUSTER 3
CLUSTER 3
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GAJE, Harvey Jay M. · 100問 · 2年前CLUSTER 2
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CLUSTER 2
GAJE, Harvey Jay M. · 100問 · 2年前CLUSTER 2
CLUSTER 2
100問 • 2年前CLUSTER 2
CLUSTER 2
GAJE, Harvey Jay M. · 100問 · 2年前CLUSTER 2
CLUSTER 2
100問 • 2年前CLUSTER 2
CLUSTER 2
GAJE, Harvey Jay M. · 100問 · 2年前CLUSTER 2
CLUSTER 2
100問 • 2年前問題一覧
1
The Bucky slot cover is in place to protect the
1. Patient
2. Radiologist
3. Radiologic Technologist
2 only
2
Used chemical bottles can be recycled:
Always False
3
For testing white light leaks, frequency of test is done every
1. Week
2. Month
3. 6 months
4. As needed
3 & 4 only
4
When testing for white light leaks, you are recommended to stay inside the darkroom for minutes while the safelight is switched off?
10
5
The recommended distance of facing down safelight from the working bench is approximately cm.
130 cm
6
Which of the following are used to check for focal spot size?
1.Star pattern
2.Pinhole camera
3.Slit camera
4. Wire mesh
1,2 & 3 only
7
Which among the following is the most accurate way to test for focal spot size?
1.Star Test pattern
2.Pinhole camera
3.Slit camera
4.Wire mesh
2 only
8
Which of the following are used to test for kVp accuracy?
1. Wisconsin cassette
2. Sussex cassette
3. Ardran-Crookes
1,2 & 3
9
The accepted tolerance level for collimation is ±____ % SID
2
10
The accepted tolerance level for exposure linearity % ____ > 10ms
10
11
The minimum HVL required for 3 phase/high frequency units using 70kVp is about mmAl,
2.0
12
AEC ion sensitivity chambers have to be sensitive within +/- ___ % in the same areas.
10
13
What should be used to examine areas that have poor detail?
Wire mesh test
14
For x-ray/light beam alignment, which of the following is/are used?
1. 8 coins
2. 4 Paper clips
3. Lead markers
4. Star test
1,2 & 3 only
15
Exposure reproducibility should be maintained within ‡ %
5
16
Being a radiation worker, the expected days of life lost is
12 days
17
Acute radiation lethality follows a response relationship.
Nonlinear, threshold
18
During this period, the person is free of visible effects.
Latent
19
The Mean Survival Time (MST) for Gl syndrome is days
4-10
20
What is the minimum threshold dose for death to occur for a whole-body exposure?
200 rad
21
A pregnant radiographer must have how many ersonnel monitoring device?
2
22
The following are the established protocol for radiography of the pregnant patient, EXCEPT:
All are correct
23
Radiation are categorized as to primary and secondary radiation. Which of these is considered a primary radiation?
X-rays from the tube towards the patient in forward direction
24
It is the most critical, target molecule in the body that serves as the command and control for cell function.
DNA
25
The following are considered as deterministic effects of radiation exposure, except:
genetic effects
26
The following describe stochastic effects EXCEPT:
dependent of radiation dose
27
The division wherein the nucleus swells and the DNA becomes more prominent:
prophase
28
The breakdown of protein metabolism produces:
amino acids
29
The powerhouse of the cell:
mitochondria
30
Weekly MPD for occupational exposed persons:
100 mrem
31
If the quality factor (QF) of ionizing radiation is higher, relative biological effectiveness:
is also higher
32
30. A film badge monitoring device used for monitoring of personnel can:
1. record the image of the aluminum or copper filters which are contained in the plastic holder
2. be compared with a control badge by the monitoring company
3. record doses below 10 millirem
1 & 2 only
33
Application/s of radiation dose - response relationship:
both
34
The sequence of events following high - level radiation exposure leading to death within days or weeks is called the:
acute radiation syndrome
35
The technologist has considerable control over both image quality and patient dose, depending on which materials or methods are selected for each examination. One technique that reduces patient dose and improve image quality at the same time, day is:
collimating to the area of clinical interest
36
Cardinal principles of radiation protection:
1. time
2. distance
3. sheilding
1,2 & 3
37
Which of the following statement correctly describes the predicting aspect of the latent period?
the duration of the latent period is an indicator of the severity of effects to come
38
Within few months after x - ray was discovered they were being used for medical diagnosis and treatment, resulting in the first visible biologic effects of radiation on humans. Which of the following is an immediate or early effect of radiation?
skin erythema
39
Sources of unnecessary exposure:
1. annual chest radiograph
2. routine fluoroscopy in person older than 40 years
3. mammography examination in high risk female
1,2
40
In the early 1900's, Bergonie and Tribondeau formulated some theories about the radiosensitivity of biologic tissue. The Law of Bergonie and Tribondeau formulated in part that:
when metabolic activity is high, radiosensitivity is high
41
The target theory is a concept for classifying radiation effects in the cellular level. The basis of this theory is that in every cell there is a significant target, if rendered nonfunctional will result in death of cell. Which of the following is that most important molecular target?
DNA
42
The aluminum filtration reduces patient dose by:
removing the longer - wavelength photon from the beam
43
The shielding of a typical x-ray room is:
1/16 inch of lead - 2.5mm of lead
44
Which of the following has the greater shielding value?
2 Tenth Value Layers (TVLs)
45
Thermoluminescent dosimeters:
AOTA
46
The most means of reducing patient exposure:
distance
47
Based form the principle of radiation protection under Distance, when the distance is doubled, the intensity is:
decrease 1⁄4 its original value
48
In mobile radiography, the radiographer should:
1. Stand at least 6 ft from the source
2. Stand behind a corner, if possible
3. Use low kVp techniques
1 & 2 only
49
Barrier classification which includes all the different protective apparels:
secondary barrier
50
Which of the following group of people have higher dose limits?
radiation workers
51
A sun-burn like reddening of the skin resulting to long exposure to radiation
erythema
52
What is the minimum equivalent of total filtration required for diagnostic x-ray operating above 70 kVp?
2.5 mm
53
What term is used to describe radiation damage that increases the probability of including a late effect but will not increase the severity of the effect (ex. Carcinogenesis, life shortening)?
stochastic
54
How many half - value layers of filtration must be added to the primary beam to reduce its intensity to approx 3% of its original value?
5
55
It results from maintaining the anode at elevated temperatures for prolonged periods.
long exposure time
56
It is the unit of energy used to measure the heat capacity of the x-ray tube/unit.
head units
57
High frequency generator is recommended rather than high voltage generator because of the following reasons EXCEPT:
low cost
58
For what purpose is there a negative electrical charge on the focusing cup?
to draw the electrons together into a stream
59
The function of x-ray tube rating chart
Correct exposure factors for radiographic exam.
60
Rectification used:
Convert AC to pulsating DC
61
Part of Cathode assembly
1. Filament
2. Target
3. Focusing cup
1 & 3
62
Material added to tungsten for construction of a long-lasting filament
thorium
63
The flow of one coulomb per sec in a conductor is equivalent to one
ampere
64
mAs is a unit of
charge
65
How much of Tc-99 m will remain after 4 physical half-life if the initial activity was 2 mCi?
125 uci
66
The radiographic exposure is made at 500 mA; 100 ms the equivalent mAs is?
50 mAs
67
One disintegration per second of activity is equal to.
1 Bq
68
The number of Half lives required to reduce the activity to 1/32 of the original amount
5
69
Which among these following interaction where ionization occurs
compton scaterring
70
Among the following interactions, which of these does not produce scattered x-ray?
Photoelectric Effect
71
its purpose is to absorb soft x rays and improves the quality of the x ray beam
filter
72
Pair production produces all of the following except:
proton
73
At 100 kVp approximately how many % of bremsstrahlung x ray is produced?
85%
74
A process where an unstable nuclei spontaneously emits radiation to reach a stable state.
radioactive decay
75
Tc 99-, has initial activity of 50mCi after its activity will be 25mCi.
6 hrs
76
The maximum no. of electrons in the n-shell is?
32
77
Refers to the particle that have lower range
alpha
78
The transition of an outer orbital electron to an inner orbital shell produces?
characteristic x-ray
79
The fundamental unit of the electromagnetic radiation
photon
80
When fast moving electrons interacts at the nuclear source of a target material its kinetic energy is converted to?
bermsstrahlung
81
One coulomb of electron charge is equivalent to how many electrons?
6.25 x 10^18
82
The equivalent value of 1mCi in Bq is
37 Mbq
83
For resistor of 5 ohms, 10 ohms, 15 ohms and 20 ohms are connected in a series circuit. Determine the unknown values describe in number 84-87 if the circuit draw 110 volts from an AC source.
The total resistance is?
50
84
For resistor of 5 ohms, 10 ohms, 15 ohms and 20 ohms are connected in a series circuit. Determine the unknown values describe in number 84-87 if the circuit draw 110 volts from an AC source.
The total current is?
0.22 amps
85
For resistor of 5 ohms, 10 ohms, 15 ohms and 20 ohms are connected in a series circuit. Determine the unknown values describe in number 84-87 if the circuit draw 110 volts from an AC source.
If the four resistors are connected in a parallel circuit, what is the total resistance?
2.4 ohms
86
For resistor of 5 ohms, 10 ohms, 15 ohms and 20 ohms are connected in a series circuit. Determine the unknown values describe in number 84-87 if the circuit draw 110 volts from an AC source.
The power generated in the circuit is _____ watt?
242
87
Which one of the ff components of the diagnostic x-ray tube is on the positive side of the tube?
stator
88
A stationary anode will most likely used in which of the following
dentistry
89
Which of the following is not a function of the anode?
thermionic emission
90
A fluoroscopic examination at 85 kVp at 4mA, single phase requires a 4mins the number of anode heat units produced would be approximately?
81,600
91
The x-ray emission spectrum principally depends on which of the following
2
92
Normally the x-ray emission spectrum contains?
Both characteristic and Bremsstrahlung
93
The characteristics x-ray emission spectrum principally depends on which of the following?
target material
94
The continuous x-ray emission principally depend on which of the following
target material
95
The x ray emission spectrum represents
X-rays emitted from x-ray tube
96
The formula for heat unit in a single phase high voltage generator is?
kVpxmAxs
97
When the mAs is increased the x-ray quantity?
Increase proportionately
98
The heel effect most likely to increase when reducing the;
field size
99
In general xray quantity will increase with?
increase kVp
100
The thickness of the material required to reduce the intensity of the beam to 1⁄2 of its original value
HVL