4: Radiation Units

Question 1

How is characteristic intensity always specified?

Answer 1

Per hour at a distance of one metre from source.

Question 2

How is characteristic intensity expressed in metric and imperial?

Answer 2

Metric: mSv/h per GBcq
Imperial: R/h per curie

Question 3

How do you calculate dose rate?

Answer 3

Activity in GBcq x C.I. in mSv/h = dose rate in mSv/h

Activity in curies x C.I. in R/h = dose rate in R/h

Question 4

What is Roentgen (R) a unit of?

Answer 4

Exposure dose

Question 5

What is Roentgen (R) based on?

And what can in produce in one cubic centimetre of air?

Answer 5

Ionization of air.

1 R can produce approx. 2.08 x 10^9 ion pairs in one cubic centimetre of air.

Question 6

As there is no specific unit for surface intensity exposure, QUANTITY is expressed in what?

Answer 6

Coulomb per kg (C/kg) in metric.

Question 7

What is the unit of absorbed dose in human tissue?

Answer 7

The Gray (Gy)

Absorption of one joule of ionizing energy per kilo of matter

Question 8

What is the RAD?

Answer 8

Radiation absorbed dose

Question 9

In human tissue, one rad of absorbed dose is equal to how much exposure?

Answer 9

1 Roentgen of gamma radiation

Question 10

What is the rad DEFINED as?

Answer 10

The absorption of 100 ergs of energy per gram of matter?

Question 11

1 Gy is equal to how many RADs?

Answer 11

100 RADs

Question 12

What 2 factors do radiation effects depend on?

Answer 12

1. Amount of energy deposited

2. Type of radiation

Question 13

How do you calculate biological effects?

Answer 13

Absorbed dose x radiation weighing factor = biological effects

Question 14

1 Sv is equal to how many mSv?

Answer 14

1 Sv = 1000mSv

Question 15

1 mSv is equal to how many microSv?

Answer 15

1 mSv = 1000 microSv

Question 16

1 mSv is equal to how many mR?

Answer 16

1 mSv = 100 mR

Question 17

1 R is equal to how many mSv?

Answer 17

1 R = 10 mSv