Coi chung nhiem khi phong xa trong nha

Radon - mot loai khi phong xa thoat ra tu mat dat - da khien cac nha khoa hoc phai giat minh ve muc do nguy hiem cua no sau nhieu nam coi thuong.

Theo thong ke moi day, gan 10% so ca tu vong vi benh ung thu phoi o chau Au va My la do khi radon. Co quan An toan phong xa BFS lien bang Duc moi day da khuyen cao nguoi dan tren toan lanh tho can nhan thuc sau sac ve muc do nguy hiem cua "ke sat nhan tham lang" nay.

Theo chuyen gia Wolfgang Weiss cua BFS, khi radon dang tich tu luong lon trong cac ngoi nha va cong so. Chau Au co khoang 20.000 ca tu vong moi nam vi can benh ung thu phoi do tiep xuc voi khi radon.

Khi phong xa radon ton tai duoi dang khi khong mau, khong mui vi. No sinh ra tu qua trinh phan huy tu nhien cua kim loai urani trong dat. O ngoai troi, nong do radon thap nen khong gay nguy hiem. Song o moi truong chat hep nhu trong nha va van phong, nong do radon tang cao do qua trinh tich tu. Hit tho khi radon mot thoi gian dai se khien to chuc phoi tiep xuc truc tiep voi phong xa. Nguy co mac ung thu phoi co the tang gap doi, tham chi gap ba neu song nhieu nam trong ngoi nha bi nhiem doc radon. Nhung nguoi nghien thuoc la dac biet nhay cam voi khi nay.

Radon tham nhap vao nha chu yeu qua:

- Cac vet ran nut tren mat san cua tang ham, tang tret.

- Cac ong dan nuoc.

- Dat lo thien.

Ngoai ra, radon con co the thoat ra tu gieng nuoc, song khong dang ke so voi luong khi thoat ra tu dat nen.

Nong do radon trung binh trong nha la khoang 1.25 picocury tren mot lit khi (pCi/L). Tren 4 pCi/L duoc xem la muc bao dong. Giai phap cai thien moi truong hieu qua nhat la lap dat he thong thong gio o tang ham hoac duoi mai nha.

My Linh (theo IOL)