The number of atoms N remaining at a particular instant in time is given by A λ N Where A the activity The traditional unit for activity is called the curie Ci 1 curie 37 x 1010 disintegrations per second ID: 915442
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Slide1
Slide2The Activity
:-The activity, defined as the instantaneous number of atoms decaying per unit time. The activity is directly determined by the quantity of radioactive material in a sample, and is generally a much more convenient quantity to use than the number of radioactive atoms.
The number of atoms,
N
, remaining at a particular instant in time is given by:
Slide3A =
λ N
Where
A
= the activity, The traditional unit for activity is called the curie (
Ci
).
1 curie = 3.7 x 1010 disintegrations per second (
dps
)
OR
1 curie = 2.22 x 1012 disintegrations per minute (
dpm
)
Because the curie is a very large quantity, fractions of the curie are often used:
Slide41
millicurie = (mCi) = 2.22 x 109 dpm = 10-3 curies
1
microcurie
= (
μCi
) = 2.22 x 106
dpm
= 10-6 curies
1
nanocurie
= (
nCi
) = 2.22 x 103
dpm
= 10-9 curies
1 picocurie = (
pCi
) = 2.22
dpm
= 10-12 curies