▁its ▁analog ue ) ▁so ▁that ▁it ▁prefer entially ▁bind s ▁to ▁the ▁tum our . ▁With ▁a ▁g amma ▁em itter ▁as ▁the ▁rad ion uclide , ▁the ▁technique ▁can ▁be ▁used ▁for ▁imag ing ▁with ▁a ▁g amma ▁camera ▁or ▁P ET ▁sc anner ▁to ▁locate ▁tum ours . ▁When ▁pa ired ▁with ▁alpha ▁or ▁beta ▁emit ters , ▁ther apy ▁can ▁be ▁achieved , ▁as ▁in ▁PR RT . ▁ ▁The ▁current ▁generation ▁of ▁PR RT ▁targets ▁som at ost atin ▁re cept ors , ▁with ▁a ▁range ▁of ▁analog ue ▁materials ▁such ▁as ▁oct re ot ide ▁and ▁other ▁D OT A ▁comp ounds . ▁These ▁are ▁combined ▁with ▁ind ium - 1 1 1 , ▁lut et ium - 1 7 7 ▁or ▁y tt rium - 9 0 ▁for ▁treatment . ▁ 1 1 1 It ▁is ▁primarily ▁used ▁for ▁imag ing ▁alone , ▁however ▁in ▁addition ▁to ▁its ▁g amma ▁emission ▁there ▁are ▁also ▁aug er ▁electrons ▁em itted , ▁which ▁can ▁have ▁a ▁th era pe ut ic ▁effect ▁in ▁high ▁dos es . ▁ ▁PR RT ▁radi oph arma ce ut ical s ▁are ▁constructed ▁with ▁three ▁components ; ▁the ▁rad ion uclide , ▁ch el ator , ▁and ▁som at ost atin ▁analog ue ▁( pe pt ide ). ▁The ▁rad ion uclide ▁del ivers ▁the ▁actual ▁th era pe ut ic ▁effect , ▁( or ▁phot ons ▁for ▁imag ing ). ▁The ▁ch el ator ▁is ▁the ▁essential ▁link ▁between ▁the ▁rad