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Ketering > Formulas & Numbers > Flashcards

Formulas & Numbers Flashcards

1
Q

Annual General Public Exposure

A

0.5 rem / year
5 mSv / year

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2
Q

Annual Occupational Exposure

A

5 rem / year
50 mSv / year

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3
Q

Annual Radiograph Student Exposure <18

A

0.1 rem / year
1 mSv annually

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4
Q

Lifetime Occupational Dose

A

1 rem x age in years
10 mSv x age in years

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5
Q

Annual Lens of Eye Dose

A

15 rem / year
150 mSv / year

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6
Q

Annual Skin / Hands & Feet Dose

A

50 rem / year
500 mSv / year

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7
Q

Pregnant Worker Dose

A

.5 rem / gestation
5 mSv / gestation

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8
Q

FETAL DOSE
- TOTAL
- MONTH

A

.5 rem / gestation
.5 mSv / gestation

.05 rem / month
.05 mSv / month

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9
Q
  1. SID Accuracy:
  2. Collimation Accuracy:
  3. PBL Accuracy:
  4. Alignment Accuracy:
A
  1. 2%
  2. 2%
  3. 1-2%
  4. 1%
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10
Q

Regular Apron Lead Equivalency
Minimum & Recommended

A

25 mm Pb Min.

0.5 mm Pb Rec.

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11
Q

Fluro Apron Lead Equivalency Minimum
Regular & Portable

A

Regular: 0.5 mm Pb min.
Portable: 0.25 mm Pb min.

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12
Q

Neck/Thyroid Lead Equivalency

A

0.5 mm Pb

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13
Q

Gloves Lead Equivalency

A

0.25 mm Pb

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14
Q

Eyeglasses Lead Equivalency

A

0.35 mm Pb

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15
Q

Fluro Drape Lead Equivalency
Minimum & Recommended

A

0.25 mm Pb min.
0.5 mm Pb rec.

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16
Q

Buckey Slot Cover Lead Equivalency
Minimum & Recommended

A

0.25 mm Pb min.
0.5 mm Pb rec.

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17
Q

Glass Window Lead Equivalency

A

1.5 mm Pb

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18
Q

Filtration
Inherit:
Total Below 50 kVp:
Total 50-70 kVp:
Total 70+ kVp:

A

0.5 mm Al
Below 50 kVp: 0.5 mm Al
50 - 70 kVp = 1.5 mm Al
70+ kVp = 2.5 mm Al

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19
Q

SSD Fixed X-Ray Minimum Distance:

A

12 inches
30 cm

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20
Q

SSD Portable X-Ray Minimum Distance:

A

12 inches
30 cm

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21
Q

SSD Fixed Fluro Minimum Distance:

A

15 in
38 cm

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22
Q

SSD Portable Fluro Minimum Distance:

A

12 in
30 cm

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23
Q

X-Ray Collimator to Skin Minimum Distance

A

6 in
15 cm

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24
Q

Portable Cord Length

A

2 Meters
6 Ft
72 in
180 cm

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25
Q

Scatter Intensity

A

1/1000
.001 or .1%
OF PRIMARY BEAM AT RIGHT ANGLE & 1 METER FROM PATIENT

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26
Q

Maximum Tabletop Exposure Rate in Fluro

A

10R / min @ 1 meter

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27
Q

Maximum Leakage Radiation From Tube Housing

A

100 mR / hour @ 1 meter
1 mGy / hour @ 1 meter

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28
Q

Primary Barrier Lead Equivalent

A

1/16in
.16 cm
1.6 mm

29
Q

Secondary Barrier Barrier Lead Equivalent

A

1/32 in
.08 cm
.8 mm

30
Q

Overlap of Primary & Secondary Barriers

A

1/2 in
1.25 cm

31
Q

Image Intensifier Lead Equivalency

A

2 mm

32
Q

Hematopoietic Dose

A

1 - 10 Gy
within 3-6 weeks

33
Q

Gastrointestinal Dose

A

> 6 - 50 Gy
within 1 week

34
Q

Cerebrovascular Dose

A

> 50 Gy
within hours/days

35
Q

Q.F.:
X-RAY:
GAMMA:
BETA:
ALPHA:
FAST NEUTRONS:

A

X-RAY: 1
GAMMA: 1
BETA: 1
ALPHA: 20
FAST NEUTRONS: 10

36
Q

Mitotic Delay Dose

A

.01 Gy
10 mGy

37
Q

Instant Death Dose

A

1000 Gy
in seconds

38
Q

Reproductive Death Dose

A

1 - 10 Gy

39
Q

Blood Change Dose

A

.25 Sv
25 rem

40
Q

Erythema Dose Range

A

2.0 - 6.0 Sv
200 - 600 rem

41
Q

Temporary Sterility Dose

A

2.5 Sv
250 rem

42
Q

Doses For:
LD 50/30:
LD 50/60:
LD 100:

A

LD 50/30: 300 rad (3.0 Gy)
LD 50/60: 350 rad (3.5 Gy)
LD 100: 1000 rad (10 Gy)

43
Q

Sublethal Dose Range

A

200-300 rad
2-3 Gy

44
Q

Superlethal Dose Range

A

600 - 1000 rad
6-10 Gy

45
Q

Reduction in Sperm Count & Suppressed Menstruation Dose

A

10 rad
.1 Gy
100 mGy

46
Q

Temporary Sterility in Gonads

A

200-250 rad
2 - 2.5 Gy

47
Q

Permanent Sterility in Testes & Gonads

A

500 - 600 rad
5 - 6 Gy

48
Q

Cataract Formation Dose
- Single
- Fractional

A

Single: 200 rad / 2 Gy
Fraction: 1000 rad / 10 Gy

49
Q

Preimplantation Embryonic Death Dose

A

.05 - .15 Gy
5 - 15 rad

50
Q

Second & Third Trimester Embryo Death Dose

A

> 200 mSv

51
Q

NRCP Report #105

A

Radiation Protection for Personnel

52
Q

NRCP Report #102

A

Exposure Reduction, Filtration & Shielding Requirements

53
Q

NRCP Report #147

A

Barrier Thickness

54
Q

Roentgen (R) to Coulombs /kg

Coulombs /kg to Roentgen (R)

A
55
Q

RAD to Gray (Gy)

Gray (Gy) to RAD

A
56
Q

REM to Sievert (Sv)

Sievert (Sv) to REM

A
57
Q

Conventional / Traditional Units Are:

A

Roentgen (R) = Exposure Air
rad = Radiation Absorbed Dose
rem = Radiation Equivalency / Biological Dose
Curie (Ci) = Radioactivity

58
Q

SI Units Are:

A

Coulombs/Kg (C/kg) = Exposure Air
Gray (Gy) = Radiation Absorbed Dose
Sievert (Sv) = Radiation Equivalency / Biological Dose
Becquerel (Bq) = Radioactivity

59
Q

Sieverts to Millisieverts

A
  • # of Sieverts x 1000 = mSv
60
Q

Millisieverts to Sieverts

A
  • # of millisieverts x .001
61
Q

Formula for Maximum Electrons In Orbital Shell

A

2n^2

62
Q

Centi =
Milli =

A

Centi:
1/100 or .01

Milli:
1/1000 or .001

63
Q

Power Formula

A

P = IV

64
Q

Ohms Formula

A

V - IR

65
Q

Step-Up Transformer
A. Turns Ratio
B. Voltage Increase:

A

A. 700:1
B. 500-1000

*Converts V to KV

66
Q

Step-Down Transformer Voltage

A

8 - 12 V

67
Q

Voltage & Turns Ratio Formula

A
68
Q

Ripple Effect & Efficiency:
A. Single Phase:
B. Three Phase (6p):
C. Three Phase (12p):
D. High Frequency:

A

*MINUS RIPPLE FACTOR FROM 100 = EFFICIENCY

Ketering (13 decks)

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