Quantification and Measurement of Dose (Chang's Ch 6)

Question 1

What is the SI derived unit of absorbed dose in Joules per kilogram?

Answer 1

Gy (Gray)

Question 2

1 Gy is ( ) rads?

Answer 2

1 Gy = 100 rads

Question 3

1 cGy is ( ) rads?

Answer 3

1 cGy = 1 rad

Question 4

What is the SI derived unit of equivalent radiation dose and effective radiation dose (also in joules per kilogram)?

Answer 4

Sv (Sievert)

Question 5

How is Sievert different from Gray (Gy)?

Answer 5

Different from Gy and used for safety and regulations.

Involves weighting factors for absorbed dose.

Question 6

1 Sv (Sievert) = ( ) rem, which is an older unit of equivalent/effective dose)

Answer 6

1 Sv (Sievert) = 100 rem

Question 7

What is the older unit of measurement for air KERMA or exposure?

Answer 7

R, Roentgen

Question 8

What is the unit of Roentgen, R?

Answer 8

Coulombs per Kilogram

Question 9

1 R (Roentgen) = ( ) Coulombs per Kg

Answer 9

1 R = 2.58 x 10^-4 C/Kg