Activity and Dosimetry

Question 1

What kind of atoms will break down into smaller stable atoms

Answer 1

Large unstable atoms

Question 2

What is the process of large, unstable atoms breaking down into smaller, stable atoms called

Answer 2

Radioactive decay

Question 3

What is the definition of activity

Answer 3

The number of decays per second

Question 4

How do you calculate activity

Answer 4

Activity equals number of decays divided by time (A = N/T)

Question 5

What is the units of activity

Answer 5

Becquerel (Bq)

Question 6

A source has an activity of 100 Bq. How many decays occur in one minute

Answer 6

N = AxT
N = 100 x 60
N = 6000

Question 7

As unstable atoms become stable, the source becomes less……… And the activity………

Answer 7

Radioactive
Drops

Question 8

What is the definition of half-life

Answer 8

The time taken for activity to half

Question 9

What is the definition of absorbed dose

Answer 9

The energy absorb per kilogram

Question 10

How do you calculate absorbed dose

Answer 10

D = E/M

D = Absorbed Dose
E = Energy
M = Mass

Question 11

What is the unit for absorbed dose

Answer 11

Grays Gy

Question 12

One grey equals………

Answer 12

1 J/Kg

Question 13

What three factors does the equivalent dose depend on

Answer 13

The absorbed dose
The type of radiation
The organ absorbing the radiation

Question 14

How do you calculate equivalent dose

Answer 14

H= DWr

Question 15

What does D represent

Answer 15

Absorbed dose

Question 16

What does H represent

Answer 16

Equivalent dose

Question 17

What is the unit for equivalent dose

Answer 17

Seiverts (Sv)

Question 18

What is the average annual background radiation

Answer 18

2.2 mSv

Question 19

What is the annual effective dose limit for a member of the public

Answer 19

1 mSv

Question 20

What is the annual effective dose limit for a radiation worker

Answer 20

20 mSv

Question 21

What is the equivalent dose rate

Answer 21

The rate at which we received an equivalent dose

Question 22

How do you calculate equivalent dose rate

Answer 22

H *= H/T

H* = Equivalent Dose Rate
H = Equivalent Dose (Sv)
T = Time

Question 23

.
What does H represent

Answer 23

Equivalent dose rate

Question 24

What is the unit of Equivalent Dose?

Answer 24

Sv

Question 25

If the time is in yours what is the unit of Equivalent Dose Rate

Answer 25

Sv/h

Question 26

Does the time in an Equivalent Dose Rate question have to be in seconds

Answer 26

No