Panasonic PT-DZ12000U Operating Instructions Manual page 59

Effective Half-Life
t = t x t / (t + t )
eff r b
where;
Effective Removal Constant
ë = ë + ë
eff r b
where;
Calculating Internal Dose (ICRP 30)
H (T S) = (1.6E-10)U SEE(T S)
50
H = 50 year dose equivalent commitment in sieverts
50
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.
SEE = Y E AF 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
M = mass of the target organ
T
U = number of nuclear transformations in the source organ
S
(S) during the time interval for which the dose is to be
calculated
INTERNAL DOSIMETRY
r b
t = radioactive half-life
r
t = biological half-life
b
ë = decay constant = 0.693 / t
r
ë = biological removal constant -0.693 / t
b
T
S
48
½
b