RP Numbers

pair production occurs at

1.022 Mev

Cosmic Radiation annually

0.3 mSv

Terrestrial radiation annually

2 mSv

Internal radiation annually

0.7 mSv

DX exposure annually

0.6 mSv

Dose recieved during air travel

0.005-0.01 mSv/hr

Quality factor of x ray and gamma

1

Quality factor of beta

1 msv

quality factor of fast neutrons

20

QF for alpha particle

20

weighing factor for gonads

0.2

Annual occupational effective dose limit

50 msv

CummEFD

10 msv x age

Occupatonal exposure to lens of ey

150 msv

occupational exposure to skin, hands, feet

500 msv

Frequent Effective dose limit

1 msv

infrequent effective dose limit

5 msv

infrequent skin, hand, feet

50 msv

Educational effective annual limit

1 msv

educational exposure to lens of eye

15 msv

embryo-fetus exposure limit (monthly)

0.5 msv

Entire gestation

5.0 msv

Shields must have _________ lead

0.5 mm

Entrance to skin dose

0.05 msv per procedure

GSD

0.20 msv

max leakage

1 mGy/hr at 1 meter

Skin to surface distance requirement

15 CM

Inherent filtration

0.5 mm al

Total filtration

50-70Kvp= 1.5 mmAl, 70+kvp= 2.5 mmAl, mobile unit= 2.5 mmAl

Source to skin distance for mobile

12 IN

Min permanently installed Filtration

2.5 mm Al ( 3.0 prefferred)

Source to skin distance for fluoro unit

15 IN

Primary protective barrier eqv

2 mm lead

scattered x ray intensity

1/1000 (0.1%)

apron

0.5 mm lead

Primary protective barrier

1/16 in

secondary protective barrier

1/32 in lead

control booth barrier

7 ft up from floor

lead glass window

1.5 mm lead

Gloves

0.25 mm lead

Thyroid shield

0.5 mm lead

glasses

0.35 mm lead

curtain

0.25 mm

bucky slot shielding

0.25mm

Exposure to primary beam use factor

1/4

ceiling use factor

1/16

Max weekly permitted EQD

Controlled: 1msv

Uncontrolled: 20 msv