safety continued Flashcards
(42 cards)
:The tabletop exposure rate during fluoroscopy shall not exceed
A
10 mGya/min/mA
B
21 mGya/min/mA
C
10 mGya/hr
D
5 R/h
b
Which of the following radiation exposure responses exhibit a nonlinear threshold dose-response relationship?
- Skin erythema
- Hematologic depression
- Lethality
A
1 only
B
1 and 2 only
C
2 and 3 only
D
1, 2, and 3
d
Which of the following would be most likely to cause the greatest skin dose (ESE)?
A
Short SID
B
High kilovoltage
C
Increased filtration
D
Decreased milliamperage
a
Radiation output from a diagnostic x-ray tube is measured in which of the following units of measurement?
A
Gyt
B
Sv
C
Gya
D
Bq
c
The most efficient type of male gonadal shielding for use during fluoroscopy is
A
flat contact
B shaped contact (contour)
C
shadow
D
cylindrical
b
What quantity of radiation exposure to the reproductive organs is required to cause temporary infertility?
A
1000 mGy
B
2000 mGy
C
3000 mGy
D
4000 mGy
What quantity of radiation exposure to the reproductive organs is required to cause temporary infertility?
A
1000 mGy
B
2000 mGy
C
3000 mGy
D
4000 mGy
Increasing the voltage on the electrostatic lenses within the Image Intensifier of an ABS equipped fluoroscopic system will result in:
A
Increased brightness gain
B
Increased flux gain
C
Increased magnification
D
Decreased patient dose
c
Which of the following is most likely to require the lowest patient exposure?
A
Decreasing kilovoltage by 15% and doubling the milliampere-seconds value
B
Increasing kilovoltage by 15% and cutting the milliampere-seconds value in half
C
Changing collimation from 10 × 12 to 14 × 17
D
Changing from an 8:1 grid technique to nongrid
d
Moving the image intensifier closer to the patient during traditional fluoroscopy
decreases the SID
decreases patient dose
improves image quality
A
1 only
B
1 and 2 only
C
1 and 3 only
D
1, 2, and 3
d
How much protection is provided from a 100-kVp x-ray beam when using a 0.50-mm lead-equivalent apron?
A
40%
B
75%
C
88%
D
99%
b
What is the relationship between kV and HVL?
A
As kV increases, the HVL increases.
B
As kV increases, HVL decreases
C
If the kV is doubled, the HVL doubles.
D
If the kV is doubled, the HVL is squared.
a
Personnel present in the x-ray room during fluoroscopic examinations wear lead aprons to protect them primarily from
A
photoelectric scatter.
B
Compton scatter.
C
pair production.
D
magnetic fringe field.
b
Which of the following is most likely to result in the greatest increase in patient exposure?
A
Changing from 100 mA to 200 mA
B
Increasing kV 15% and cutting mAs in half
C
Decreasing the kV 15% and doubling the mAs
D
Changing from nongrid technique to 8:1 grid technique
d
The measure of the rate at which energy is transferred from ionizing radiation to soft tissue is termed
A
the characteristic effect
B
Compton scatter
C
linear energy transfer
D
the photoelectric effect
c
Under what circumstances might a radiographer be required to wear two dosimeters?
During pregnancy
While performing vascular procedures
While performing mobile radiography
A
1 and 2 only
B
2 only
C
2 and 3 only
D
1, 2, and 3
a
Which of the following terms refers to the number of x-ray examinations performed weekly?
A
Use factor
B
Workload
C
Time of occupancy factor
D
Controlled area
b
Federal law requires that all occupationally exposed individuals are issued dosimeters for monitoring purposes. Occupationally exposed personnel describes any individual employed in a role in which they are likely to receive what percentage or more of the annual effective dose limit of 50 mSv in the performance of their duties?
A
5%
B
10%
C
1%
D
20%
b
What’s the word frequency list radiographic equipment be checked for linearity and reproducibility
Annually
Which of the following is/are components of the secondary or high voltage side of the x-ray circuit
A. Rectification system
B auto transformer
C kv meter
A only
Design characteristics x-ray to target to determine the heat capacity include
1 the rotation of the anode
2 the diameter of the Anode
3 size of the focal spot
A 1 only
B1,2
C 1,2,3
C
When using the smaller field in a dual field image intensifier
1 the image is magnified
2 the image is brighter
3 a larger atomic area is viewed
A 1
B 1 3
C 2 3
D 1 2 3
A
Which of the following system functions to compensate for changing patient particular start fluoroscopy procedures
A automatic break his control
B Modification gain
C Automatic resolution control
A
Which of the following combinations would pose the least heat hazard to a particular single phase anode
A 1.2 mm focal spot, 92 kv, 1.5 mAs
B .6 mm focal spot, 80 kv 3 mas
C 1.2 mm focal spot, 70 kv 6mas
D .6 mm focal spot 60 kv 12 mas
A low mas, high KVP large focal spot
what is the relationship between kv and HVL
as kv increases HVL increases
