Formulas & Numbers Flashcards
Annual General Public Exposure
0.5 rem / year
5 mSv / year
Annual Occupational Exposure
5 rem / year
50 mSv / year
Annual Radiograph Student Exposure <18
0.1 rem / year
1 mSv annually
Lifetime Occupational Dose
1 rem x age in years
10 mSv x age in years
Annual Lens of Eye Dose
15 rem / year
150 mSv / year
Annual Skin / Hands & Feet Dose
50 rem / year
500 mSv / year
Pregnant Worker Dose
.5 rem / gestation
5 mSv / gestation
FETAL DOSE
- TOTAL
- MONTH
.5 rem / gestation
.5 mSv / gestation
.05 rem / month
.05 mSv / month
- SID Accuracy:
- Collimation Accuracy:
- PBL Accuracy:
- Alignment Accuracy:
- 2%
- 2%
- 1-2%
- 1%
Regular Apron Lead Equivalency
Minimum & Recommended
25 mm Pb Min.
0.5 mm Pb Rec.
Fluro Apron Lead Equivalency Minimum
Regular & Portable
Regular: 0.5 mm Pb min.
Portable: 0.25 mm Pb min.
Neck/Thyroid Lead Equivalency
0.5 mm Pb
Gloves Lead Equivalency
0.25 mm Pb
Eyeglasses Lead Equivalency
0.35 mm Pb
Fluro Drape Lead Equivalency
Minimum & Recommended
0.25 mm Pb min.
0.5 mm Pb rec.
Buckey Slot Cover Lead Equivalency
Minimum & Recommended
0.25 mm Pb min.
0.5 mm Pb rec.
Glass Window Lead Equivalency
1.5 mm Pb
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
SSD Fixed X-Ray Minimum Distance:
12 inches
30 cm
SSD Portable X-Ray Minimum Distance:
12 inches
30 cm
SSD Fixed Fluro Minimum Distance:
15 in
38 cm
SSD Portable Fluro Minimum Distance:
12 in
30 cm
X-Ray Collimator to Skin Minimum Distance
6 in
15 cm
Portable Cord Length
2 Meters
6 Ft
72 in
180 cm
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