Measurements+Conversions Oh my!

What is the measurement for exposure in the old/standard system

Roentgen

What is the measurement for exposure in the new/SI system

Coulombs/kilogram (C/Kg)

What is the measurement for dose in the old/standard system

Radiation absorbed dose (rad)

What is the measurement for dose in the new/SI system

Gray (Gy)

What is the measurement for dose equiv. in the old/standard system

Roentgen Equiv. in men (rem)

What is the measurement for dose equiv. in the new/SI system

Sievert (sv)

Amount of radiation

Exposure

Energy absorbed by tissue

Dose

Biologic effects

Dose equiv.

What is the conversion from Roentgen (R) to coulombs per kilogram (C/kg)?

1 R = 2.58 x 10⁻⁴ C/kg

What is the conversion from coulombs per kilogram (C/kg) to Roentgen (R)?

1 C/kg = 3.88 x 10³ R

What does exposure tell us in terms of radiation

Only how much radiation was present

What is the conversion from rad to Gray (Gy)?

1 rad = 0.01 Gy

What is the conversion from Gray (Gy) to rad?

1 Gy = 100 rads

What does dose tell us about radiation

Only how much radiation was absorbed 

What is the conversion from rem to Sievert (Sv)?

1 rem = 0.01 Sv

What is the conversion from Sievert (Sv) to rem?

1 Sv = 100 rem

How is the dose equivalent in rem calculated?

rem = rad × QF (Quality Factor)

What is the Quality Factor (QF) for X-rays?

For X-rays, QF = 1

What does the Sievert (Sv) represent in the SI system?

Sv is the SI unit for dose equivalent, defined the same as rem (rad × QF)