t Ipidini “to no}ssex4 arta “te. 9rs ‘emia yon 16 noisiess1 xbod: a ow ‘time post onset: ofuptake, days, d instantaneous fraction of atoms decaying per unit time, day” ~t ao rbet ri i x = 3 ee aa pple p? ett t TO%4- rept day~!, initial atom ingestion ‘rate, “atoms toy instantaneous fraction of atoma removed from compartment. i by de Vai vidun euosne sandend ot ee ramay Jad sina ums snived physiological mechanisms, day compartment i deposition fraction, the number, of,atdas /in“compartment i‘ relative, to the number in all 4 i compartments at+the onset of declining continuous uptake, (t*0), tour gE Pd werd oy. Witob ete bth tba a instantaneous urine activity concentration, Bq & uf! - gpalds @eoiie! maT Quatk subject urine excretion rate, & day 1, a fraction from:Gl; FEaSt, to dloods s+, pe fraction excreted by the urine pathway, | + 8G ba | 5 st instantaneous fraction of atoms removed or added to the atom uptake ma. Pray! a ett 7 : (ype ery Yo i? atu de i per unit time, day~*, due to dactore® ot er. than radioactive decay, wet ou 2 instantaneous body burden, Bq, cat ee body burden at the onset of uptake, ‘Bq, ed utah sey ee the number of disintegrations in all compartments occurring ‘during the uptake interval, Bq days, . : The development of Eqs. (1), (2), and (3) was based on the following convolution integral. At some variable time, T, defined during a fixed uptake interval, T, the daily activity ingestion rate crossing the gastrointestinal tract to blood is given by ures “4 SOM o e ~(ketdr) Tt e aya ee Re heats Preeoy! rote Pete. AEP