Lowry, Colorado (39° 46' NHN lok® 53' Ww) Apparent se Of _Altityde Observa- - x 10” tion (ft.) 10 Apr.'59 92 3 Jun. 94 . 3 Jun. gh © % Contributions Dete Of Origin Sr-89 Zr-95 13 October 1958 Ce-1h4 Sr-89 Zr-95 Ce-1hh ik Jun. 58-26 Mar. 58 ~—s-15 Jon. 58 15 10 52 29 May 58 28 Fed. 58 29 May 58 ~ 13 8 70 14 May 58 18 Jul. 58 15 - 10 &0 3 Aug. 58 13 17 83 Sr-90 Sr-90 3 Jun. 58 Sr-90 Sr-90 Sr-90 Sr-90 k Jun. 93.5 - 30 May 58 10 May 58 4 Jun. 93.5 30 May 58 . 10 May 58 20 May 58 14 16 6&9 28 Mar. 58 22 May 58 15 11 69 28 Mar. 58 16 Jun. 58 =~. ‘Li 10 7h 32 10 42 2 2 2 5 59 11 Jun. 96.2, 11 Jun. 96.2, 6 Jun. 58 12 May 58 Panama, Canal Zone (08° N58' N “T Nov. 58 65.2 30 Jul. 58 16 Nov. 58 89.0 31 Dec. 57 19 Nov. 58 61.8 8 May 58. 79° 33' W) 5 Mar. 58 18 Oct. 57 14 Oct. 57 20 May 57 29 Dec. ST 14 Mar. 58 UL rare 26 (101) 3 Sep. 57 .2 10 ' 37 2 Dec. 58 65:8 15 Aug. 58 17 Jun. 58 (12 Dec. 58 = 92.6 22 Dec. 57 7 Mar. 58 23 Oct. 58 NAS NOTES: w~~-, .--3 no observation, oo 3 the isotope amount of numerator = 0. ( * ) 3 percentage values greater than 100%. 3 Gate later than sampling time. - 175 - ; THE COLLECTIONS cr ine fae S OF THE NATIONAL ACADEMY OF SCIENCES

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