E tohu ana te pereti mata ki te pereti kua hurihia ki te mata whakarewa.He kaha te aukati i te waikura, te waikawa me te kawakore, he rauemi whakamarumaru iraruke hoki he iti rawa te utu i roto i te maha o nga ahuatanga penei i te hanga-a-waikawa-a-taiao, te whakamarumaru rongoa rongoa, X-ray, te whakamarumaru o te ruuma CT, te whakararu me te tangi oro. He kaha anti-corrosion, waikawa me te alkali ātete, hanga taiao waikawa-tohu, tiaki radiation hauora, X-hihi, CT ruma tiaki radiation, aggravation, oro marara me te maha atu āhuatanga, a ko te reira he rauemi tiaki radiation āhua inexpensive.