
plocroic haalo

graanaitilum mattu agniparvvatha paarakalilum kaanapedunna biotite polulla dhaathukkalkullile varnnanathinte (plochroism) oru microscopic, golaakrithiyilulla shelaanu plocroic haalo allengil radiohalo. aathidheya kristtal gadanaykkullil minitt radio active christalukal ulppeduthunnathu moolamundaakunna vikirana naashanashtangalude oru mekhalayaanu haalo. ulppeduthalukal saadhaaranayaayi sircon, appaattait allengil titanite aanu, avaykku euranium allengil thorium avayude kristtal gadanakalil ulkkollaan kazhiyum. nucleus puranthallunna alfa kanangalaan niram maarunnath ennathaanu oru vishadeekaranam; concentric shellukalude aaram kanangalude oorjjathinu aanupaathikamaanu.
uthppaadanam.
euranium-238 thorium, radium, raadon, polonium, ledu ennivayiloode shayikkunna oru kramatthe pinthudarunnu. eee shreniyile alfa-emitting isodoppukalaaniva. (avayude thudarchayaaya oorjja vitharanavum valia vyapthiyum kaaranam, beetta kanikakalkku vyathyastha valayangal roopappeduthaan kazhiyilla.)
oru pleochroic haaloyude anthima savisheshathakal prarambha isotopine aasrayichirikkunnu, koodaathe oru haaloyude oro valayathinteyum valuppam alfa kshaya oorjjathe aasrayichirikkunnu. yuu-238ll ninnu roopappedunna oru pleochroic haloic saidhaanthikamaayi ettu concentric ringukalundu, anchu yadhaarthathil oru prakasha microscopinu keezhil verthirichariyaan kazhiyum, athesamayam poloniyatthil ninnu roopappedunna haloic aarambikkunna metteeriyal eathu isotopaanu ennathine aashrayich onnu, rund, allengil moonnu ringukal maathrameyulloo. yuu-238 haalosil, yuu-234, ra-226 valayangal th-230-maayi yojichu oru valayam roopappeduthunnu; rn-222, poow-210 valayangalum oru valayam roopappeduthunnu. oru petrographic microscopinu keezhil eee valayangal parasparam verthirichariyaan kazhiyilla.

