- FO ere = A Pheer .- A 7 | 7 Mw - RE ieatearematereatiets. 7) ea Prisha Te Pe eos Oe PE Ee weraeater:fey Nee ceasese toki : queer TOME thks 522 Be Br eee MEASUREMENTS OF RADON CONCENTRATIONS Flask Results 10-15 e¢/l Prec. Date Time 57th & Columbus Ave.* None 12/4/56 1425 230 19th & Ninth Ave. * None Prec. 12/4/56 12/14/56 1459 1115 490 130 Vandam Street & 6th Ave.* None 12/4/56 1520 320 None 12/4/56 1541 2ko None 12/4/56 1626 70 61st & Ninth Ave.* None 12/11/56 1500 120 89th & Central Park W. None 12/18/56 1425 20 1427 190 Location Street Samples . . E. Housten & Allen Sts.* 68th between 2nd & 3rd | Avenues* | | Duane St. & W. Broadway: None 12/18/56 1505 1506 - 1507 70 150 110 E. 87th St. & First Ave. None 12/26/56 1342 160 1344 210 1432 1433 100 50 | | W. 120th & Broadway . ; , 12/26/56 None Prec. 7 230 60 100 1/29/57 | | 415 1416 1417 80 Prec. - j | 1426 - 1/23/57 1343 1434 150 1339 100 100 1338 107th & Second Ave. Prec. 1/23/57 1410 2ist & Third Ave. Prec. 1/23/57 1450 ekth & Tenth Ave. Prec. 1/23/57 1520 . 225 CO? 50 1412 1452 1521 80 120 120 100 90 110 ul7s