Formulas & Numbers Flashcards by Jolene Lavelle

Annual General Public Exposure

0.5 rem / year
5 mSv / year

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Annual Occupational Exposure

5 rem / year
50 mSv / year

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Annual Radiograph Student Exposure <18

0.1 rem / year
1 mSv annually

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Lifetime Occupational Dose

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

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Annual Lens of Eye Dose

15 rem / year
150 mSv / year

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Annual Skin / Hands & Feet Dose

50 rem / year
500 mSv / year

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Pregnant Worker Dose

.5 rem / gestation
5 mSv / gestation

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FETAL DOSE
- TOTAL
- MONTH

.5 rem / gestation
.5 mSv / gestation

.05 rem / month
.05 mSv / month

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SID Accuracy:
Collimation Accuracy:
PBL Accuracy:
Alignment Accuracy:

2%
2%
1-2%
1%

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Regular Apron Lead Equivalency
Minimum & Recommended

25 mm Pb Min.

0.5 mm Pb Rec.

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Fluro Apron Lead Equivalency Minimum
Regular & Portable

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

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Neck/Thyroid Lead Equivalency

0.5 mm Pb

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Gloves Lead Equivalency

0.25 mm Pb

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Eyeglasses Lead Equivalency

0.35 mm Pb

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Fluro Drape Lead Equivalency
Minimum & Recommended

0.25 mm Pb min.
0.5 mm Pb rec.

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Buckey Slot Cover Lead Equivalency
Minimum & Recommended

0.25 mm Pb min.
0.5 mm Pb rec.

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Glass Window Lead Equivalency

1.5 mm Pb

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

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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SSD Fixed X-Ray Minimum Distance:

12 inches
30 cm

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SSD Portable X-Ray Minimum Distance:

12 inches
30 cm

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SSD Fixed Fluro Minimum Distance:

15 in
38 cm

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SSD Portable Fluro Minimum Distance:

12 in
30 cm

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X-Ray Collimator to Skin Minimum Distance

6 in
15 cm

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Portable Cord Length

2 Meters
6 Ft
72 in
180 cm

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Scatter Intensity

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

Maximum Tabletop Exposure Rate in Fluro

10R / min @ 1 meter

Maximum Leakage Radiation From Tube Housing

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

Primary Barrier Lead Equivalent

1/16in .16 cm 1.6 mm

Secondary Barrier Barrier Lead Equivalent

1/32 in .08 cm .8 mm

Overlap of Primary & Secondary Barriers

1/2 in 1.25 cm

Image Intensifier Lead Equivalency

2 mm

Hematopoietic Dose

1 - 10 Gy within 3-6 weeks

Gastrointestinal Dose

>6 - 50 Gy within 1 week

Cerebrovascular Dose

>50 Gy within hours/days

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

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

Mitotic Delay Dose

.01 Gy 10 mGy

Instant Death Dose

1000 Gy in seconds

Reproductive Death Dose

1 - 10 Gy

Blood Change Dose

.25 Sv 25 rem

Erythema Dose Range

2.0 - 6.0 Sv 200 - 600 rem

Temporary Sterility Dose

2.5 Sv 250 rem

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

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

Sublethal Dose Range

200-300 rad 2-3 Gy

Superlethal Dose Range

600 - 1000 rad 6-10 Gy

Reduction in Sperm Count & Suppressed Menstruation Dose

10 rad .1 Gy 100 mGy

Temporary Sterility in Gonads

200-250 rad 2 - 2.5 Gy

Permanent Sterility in Testes & Gonads

500 - 600 rad 5 - 6 Gy

Cataract Formation Dose - Single - Fractional

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

Preimplantation Embryonic Death Dose

.05 - .15 Gy 5 - 15 rad

Second & Third Trimester Embryo Death Dose

>200 mSv

NRCP Report #105

Radiation Protection for Personnel

NRCP Report #102

Exposure Reduction, Filtration & Shielding Requirements

NRCP Report #147

Barrier Thickness

Roentgen (R) to Coulombs /kg Coulombs /kg to Roentgen (R)

RAD to Gray (Gy) Gray (Gy) to RAD

REM to Sievert (Sv) Sievert (Sv) to REM

Conventional / Traditional Units Are:

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

SI Units Are:

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

Sieverts to Millisieverts

- # of Sieverts x 1000 = mSv

Millisieverts to Sieverts

- # of millisieverts x .001

Formula for Maximum Electrons In Orbital Shell

2n^2

Centi = Milli =

Centi: 1/100 or .01 Milli: 1/1000 or .001

Power Formula

P = IV

Ohms Formula

V - IR

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

A. 700:1 B. 500-1000 *Converts V to KV

Step-Down Transformer Voltage

8 - 12 V

Voltage & Turns Ratio Formula

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

*MINUS RIPPLE FACTOR FROM 100 = EFFICIENCY