tiate that t = = laisini to nolaaeat®«edd Yo 3 omi3 wns Je noijnaist1 “hod ytonw time post onset: of:uptake, days, d instantaneous fraction of atoms decaying per unit time, day” a p? initial atom ingestjon rate, “atoms day~!, tf instantaneous fraction of atoms removed from compartment. i by ated a - ames dads -7 am physiological mechaniems, day™‘, db Vdivilvan eooune dun deni fe compartment i deposition fraction, the number, of atéus ’in “compartment ‘i‘ gelat¢ive.to the number in all is | compartments atthe onset of declining continuous uptake, (c#0), pes PP BA 8 SETCOS tha tote wy! instantaneous urine activity concentration, Bq 2™*, : subject urine excretion rate, & day”*, ia wes et Dana ~~] . ‘ VGalb at fraction fromGl; gest .to bloods; 4+..4,, oo, " ee Gh | fraction excreted by the urine pathway, / wt instantaneous fraction of atoms removed or added to the atom uptale * tao Ted 1G per unit time, day” 1 due to ‘ factors"o ther’ than’” padiogeive |‘decay, : wit i at "EMA instantaneous body burden, Ba, o itt wn sit body burden at the onset of uptake, Bay eng ‘ yet 3 idgt elit sh a ara 4 i the number of disintegrations in all compartments occurring durin, the uptake interval, Bq days. The development of Eqs. (1), (2), and (3) wae based on the following ciivolution integral. At some variable time, T, defined during « fixed uptake interval, T, the daily activity ingestion rate crossing the gastrointestinal tract to blood is given by Af P o e -(kgtA)t . eo i “ fre