‘we . pow is “an Table 1. Region eU* (p.p.m.) New Hampshire 1. Manchester 2, Concord 3. Franklin 4, Conway Vermont Fitchburg Granite Binary Granite Littleton Formation Conway Granite 2. Middlebury 8. Bennington 4. Burlington Beldens Formation Glacial Drift Monkton Formation 1. | Bedrock Rutland Dunham Dolomite Mean OUTDOOR y-KADIATION LEVELS Hr. /h % 23 26 23 45 2:5 29 24 3-6 15 LT? 1-4 2-1 5 26 15 5 9 11 3-2 3-3 Q4 pr. /h 1:9 1-9 1-4 p.p.m. er/h 11 1:2 1-2 1-7 15 1:6 1:6 2-2 a4 4:3 3:5 5:6 1:0 13 20 0-8 1-0 1:0 1:1 1:3 1:3 2-6 2-2 18 Th Natural y p.D.m, av./h 0-4 11-9 0-7 15-6 7-0 a4 71 10:9 5-6 5-6 7-2 6-1 6-0 6-6 6:5 52 | Fall-out | eU (p.p.m.} | @2 il 9-4 14:3 ¥ erfh 2-2 2-2 18 27 74 23 8-7 8:6 6-8 2-0 20 a4 * Mean bedrock radioactivity as estimated by Billings‘, ip Table 2. MEAN WEEKLY DOSES IN MR./WEEK Geological category aU (p.p.m.) Outdoor Natural + Outdoor Total y* Cosmic Dunham Dolomite Beldens Formation 5 5 0-94 Lil 1:34 1-43 Monkton Formation Fitchburg Granite Littleton Formation Binary Granite Conway Granite 11 23 23 26 45 0-87 1:18 1:19 1:41 1:83 1:27 1°52 1:63 1-78 2-27 Glacial Drift 9 1-09 * Includes fall-out, averaged over all locations within an area, + Obtained as indicated in the text; in units of air dose rate. 1:43 Mean population exposure 1962 Natural Dosimeters 0-62 0:60 1:69 1:74 1:37 1-49 2-97 2-86 0°59 0-60 0-61 0-60 0-61 1:61 1:82 1-91 2:05 2-43 1-29 1-54 1:56 1-73 2-07 2-70 3-13 2:97 8-21 3-67 0-62 1-76 1:49 | 3-01 i