2 Mater teehee t ‘ x : Cote, we 4 my Isisini te nolaserd eda to m3 omt3 ynta 38 901319391 ybod 9» usiw time post onset of: uptake, days, fone at, ad d inetantaneous fraction of stome decaying per unit time, day"! pe initial atom ingestion ‘rate, “atous day~?, i” s instantanecus fraction of atoms removed from compartment. i by enpeok ot ce eames tad? i-0 amid physiological mechanisms, day~*, th Vaoavidun PUIG UN Ted ofl? at compartment i deposition fraction, the number, of atémsin*compertmqnt ‘i*zelative,to the number in al! "ys i compartments atthe onset of declining continuous uptake, (t=O), a vee yeale yoy emi ty. ;SPW ETB PU tid Wt we) instantaneous urine activity concentration, Bq at, : . : ~] un fraction from: Gl, s¢ast , to bloods ( 4+.4,> @eaten: oe Do ausbt subject urine excretion rate, & day™*, fraction excreted by the urine pathway, tods oye ; wy Gh | | 5 instantaneous fraction of atoms removed or added to the atom uptake : Coe Ebay b Salas leagaipi of: Foe itudes | per unit time, day”, due to factors’ other than radioactive decay, ve vie . ; instantaneous body burden, 5q, sat body burden at the onset of : eiqmeaye ‘uptake, Bq, — sah a yrrandtah ae jg toe + oy EP de Hr Eg the number of disintegrations in all compartments occurring ‘during the uptake interval, Bq days. oo The development of Eqs. (1), (2), and (3) was based on the following cunvolution integral. At some variable time, T, defined during a fixeduptake interval, T, the daily activity ingestion rate crossing the gastrointestinal tract to blood is given by AEP TET ea ° e -(ketrA)T E *