INTERNAL DOSIMETRY
Effective Half-Life
eff
r
b
r
b
t = t x t / (t + t )
r
where;
t = radioactive half-life
b
t = biological half-life
Effective Removal Constant
eff
r
b
ë
=
ë
+
ë
r
½
where;
ë
= decay constant = 0.693 / t
b
b
ë
= biological removal constant -0.693 / t
Calculating Internal Dose
(ICRP 30)
50
S
H (T
7
S) =
(1.6E-10)U SEE(T
7
S)
50
H
=
50 year dose equivalent commitment in sieverts
where SEE is the Specific Effective Energy modified by a quality
factor for radiation absorbed in the target organ (T) for each
transformation in the source organ (S) expressed in MeV/g.
T
SEE =
3
Y
C
E
C
AF
C
Q/M
where;
Y =
yield of radiations per transformation
E =
average energy of the radiation
AF =
absorbed fraction of energy absorbed in the target organ
(T) per emission of radiation in the source organ (S)
Q =
quality factor
T
M =
mass of the target organ
S
U =
number of nuclear transformations in the source organ
(S) during the time interval for which the dose is to be
calculated
48
INTERNAL DOSIMETRY
Effective Half-Life
eff
r
b
r
b
t = t x t / (t + t )
r
where;
t = radioactive half-life
b
t = biological half-life
Effective Removal Constant
eff
r
b
ë
=
ë
+
ë
r
½
where;
ë
= decay constant = 0.693 / t
b
b
ë
= biological removal constant -0.693 / t
Calculating Internal Dose
(ICRP 30)
50
S
H (T
7
S) =
(1.6E-10)U SEE(T
7
S)
50
H
=
50 year dose equivalent commitment in sieverts
where SEE is the Specific Effective Energy modified by a quality
factor for radiation absorbed in the target organ (T) for each
transformation in the source organ (S) expressed in MeV/g.
T
SEE =
3
Y
C
E
C
AF
C
Q/M
where;
Y =
yield of radiations per transformation
E =
average energy of the radiation
AF =
absorbed fraction of energy absorbed in the target organ
(T) per emission of radiation in the source organ (S)
Q =
quality factor
T
M =
mass of the target organ
S
U =
number of nuclear transformations in the source organ
(S) during the time interval for which the dose is to be
calculate
d
48
INTERNAL DOSIMETRY
Effective Half-Life
eff
r
b
r
b
t = t x t / (t + t )
r
where;
t = radioactive half-life
b
t = biological half-life
Effective Removal Constant
eff
r
b
ë
=
ë
+
ë
r
½
where;
ë
= decay constant = 0.693 / t
b
b
ë
= biological removal constant -0.693 / t
Calculating Internal Dose
(ICRP 30)
50
S
H (T
7
S) =
(1.6E-10)U SEE(T
7
S)
50
H
=
50 year dose equivalent commitment in sieverts
where SEE is the Specific Effective Energy modified by a quality
factor for radiation absorbed in the target organ (T) for each
transformation in the source organ (S) expressed in MeV/g.
T
SEE =
3
Y
C
E
C
AF
C
Q/M
where;
Y =
yield of radiations per transformation
E =
average energy of the radiation
AF =
absorbed fraction of energy absorbed in the target organ
(T) per emission of radiation in the source organ (S)
Q =
quality factor
T
M =
mass of the target organ
S
U =
number of nuclear transformations in the source organ
(S) during the time interval for which the dose is to be
calculated
48
INTERNAL DOSIMETRY
Effective Half-Life
eff
r
b
r
b
t = t x t / (t + t )
r
where;
t = radioactive half-life
b
t = biological half-life
Effective Removal Constant
eff
r
b
ë
=
ë
+
ë
r
½
where;
ë
= decay constant = 0.693 / t
b
b
ë
= biological removal constant -0.693 / t
Calculating Internal Dose
(ICRP 30)
50
S
H (T
7
S) =
(1.6E-10)U SEE(T
7
S)
50
H
=
50 year dose equivalent commitment in sieverts
where SEE is the Specific Effective Energy modified by a quality
factor for radiation absorbed in the target organ (T) for each
transformation in the source organ (S) expressed in MeV/g.
T
SEE =
3
Y
C
E
C
AF
C
Q/M
where;
Y =
yield of radiations per transformation
E =
average energy of the radiation
AF =
absorbed fraction of energy absorbed in the target organ
(T) per emission of radiation in the source organ (S)
Q =
quality factor
T
M =
mass of the target organ
S
U =
number of nuclear transformations in the source organ
(S) during the time interval for which the dose is to be
calculated
48
