Activity and Dosimetry Flashcards
What kind of atoms will break down into smaller stable atoms
Large unstable atoms
What is the process of large, unstable atoms breaking down into smaller, stable atoms called
Radioactive decay
What is the definition of activity
The number of decays per second
How do you calculate activity
Activity equals number of decays divided by time (A = N/T)
What is the units of activity
Becquerel (Bq)
A source has an activity of 100 Bq. How many decays occur in one minute
N = AxT
N = 100 x 60
N = 6000
As unstable atoms become stable, the source becomes less……… And the activity………
Radioactive
Drops
What is the definition of half-life
The time taken for activity to half
What is the definition of absorbed dose
The energy absorb per kilogram
How do you calculate absorbed dose
D = E/M
D = Absorbed Dose
E = Energy
M = Mass
What is the unit for absorbed dose
Grays Gy
One grey equals………
1 J/Kg
What three factors does the equivalent dose depend on
The absorbed dose
The type of radiation
The organ absorbing the radiation
How do you calculate equivalent dose
H= DWr
What does D represent
Absorbed dose
What does H represent
Equivalent dose
What is the unit for equivalent dose
Seiverts (Sv)
What is the average annual background radiation
2.2 mSv
What is the annual effective dose limit for a member of the public
1 mSv
What is the annual effective dose limit for a radiation worker
20 mSv
What is the equivalent dose rate
The rate at which we received an equivalent dose
How do you calculate equivalent dose rate
H *= H/T
H* = Equivalent Dose Rate
H = Equivalent Dose (Sv)
T = Time
.
What does H represent
Equivalent dose rate
What is the unit of Equivalent Dose?
Sv
If the time is in yours what is the unit of Equivalent Dose Rate
Sv/h
Does the time in an Equivalent Dose Rate question have to be in seconds
No
