WikiProject Elements / Isotopes  (Rated List-class, Low-importance)
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This article is part of Wikipedia:Wikiproject Isotopes. Please keep style and phrasings consistent across the set of pages. For later reference and improved reliability, data from all considered multiple sources is collected here. References are denoted by these letters:

  • (A) G. Audi, O. Bersillon, J. Blachot, A.H. Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3-128 (2003). — Where this source indicates a speculative value, the # mark is also applied to values with weak assignment arguments from other sources, if grouped together. An asterisk after the A means that a comment of some importance may be available in the original.
  • (B) National Nuclear Data Center, Brookhaven National Laboratory, information extracted from the NuDat 2.1 database. (Retrieved Sept. 2005, from the code of the popup boxes).
  • (C) David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes. — The CRC uses rounded numbers with implied uncertainties, where this concurs with the range of another source it is treated as exactly equal in this comparison.
  • (D) More specific level data from reference B's Levels and Gammas database.
  • (E) Same as B but excitation energy replaced with that from D.
  Z   N refs symbol   half-life                   spin              excitation energy
 34  31 A   |Se-65   |<50 ms                     |3/2-#
 34  31 B   |Se-65   |<50 ms                     |
 34  31 C   |Se-65   |0.011 s                    |
 34  32 AB  |Se-66   |33(12) ms                  |0+
 34  32 C   |Se-66   |0.03 s                     |
 34  33 A*  |Se-67   |133(11) ms                 |5/2-#
 34  33 B   |Se-67   |133(11) ms                 |
 34  33 C   |Se-67   |0.13 s                     |
 34  34 AB  |Se-68   |35.5(7) s                  |0+
 34  34 C   |Se-68   |36. s                      |
 34  35 A   |Se-69   |27.4(2) s                  |(1/2-)
 34  35 B   |Se-69   |27.4(2) s                  |(1/2-,3/2-)
 34  35 C   |Se-69   |27.4 s                     |
 34  35 A   |Se-69m1 |2.0(2) µs                  |5/2-             |39.4(1) keV
 34  35 D   |Se-69m1 |2.0(2) µs                  |(5/2-)           |39.4 keV
 34  35 A   |Se-69m2 |955(16) ns                 |9/2+             |573.9(10) keV
 34  35 D   |Se-69m2 |960(23) ns                 |(9/2+)           |573.9 keV
 34  36 ABC |Se-70   |41.1(3) min                |0+
 34  37 ABC |Se-71   |4.74(5) min                |5/2-
 34  37 AD  |Se-71m1 |5.6(7) µs                  |1/2- to 9/2-     |48.79(5) keV
 34  37 A   |Se-71m2 |19.0(5) µs                 |(9/2)+           |260.48(10) keV
 34  37 D   |Se-71m2 |19(3) µs                   |(9/2+)           |260.48(10) keV
 34  38 AB  |Se-72   |8.40(8) d                  |0+
 34  38 C   |Se-72   |8.5 d                      |0+
 34  39 AB  |Se-73   |7.15(8) h                  |9/2+
 34  39 C   |Se-73   |7.1 h                      |9/2+
 34  39 AE  |Se-73m  |39.8(13) min               |3/2-             |25.71(4) keV
 34  39 C   |Se-73m  |40. min                    |3/2-
 34  40 AB  |Se-74   |STABLE                     |0+
 34  41 ABC |Se-75   |119.779(4) d               |5/2+
 34  42 ABC |Se-76   |STABLE                     |0+
 34  43 ABC |Se-77   |STABLE                     |1/2-
 34  43 AE  |Se-77m  |17.36(5) s                 |7/2+             |161.9223(7) keV
 34  43 C   |Se-77m  |17.4 s                     |7/2+
 34  44 ABC |Se-78   |STABLE                     |0+
 34  45 AB  |Se-79   |2.95(38)E+5 a              |7/2+
 34  45 C   |Se-79   |2.9E+5 a                   |7/2+
 34  45 AE  |Se-79m  |3.92(1) min                |1/2-             |95.77(3) keV
 34  45 C   |Se-79m  |3.92 min                   |
 34  46 ABC |Se-80   |STABLE                     |0+
 34  47 ABC |Se-81   |18.45(12) min              |1/2-
 34  47 AE  |Se-81m  |57.28(2) min               |7/2+             |102.99(6) keV
 34  47 C   |Se-81m  |57.3 min                   |7/2+
 34  48 A   |Se-82   |97(5)E+18 a                |0+
 34  48 B   |Se-82   |9.1(9)E+19 a               |0+
 34  48 C   |Se-82   |~1E+20 a                   |0+
 34  49 ABC |Se-83   |22.3(3) min                |9/2+
 34  49 AE  |Se-83m  |70.1(4) s                  |1/2-             |228.50(20) keV
 34  49 C   |Se-83m  |1.17 min                   |1/2-
 34  50 AB  |Se-84   |3.1(1) min                 |0+
 34  50 C   |Se-84   |3.3 min                    |0+
 34  51 AB  |Se-85   |31.7(9) s                  |(5/2+)#
 34  51 C   |Se-85   |32. s                      |5/2+
 34  52 AB  |Se-86   |15.3(9) s                  |0+
 34  52 C   |Se-86   |15. s                      |5/2+
 34  53 AB  |Se-87   |5.50(12) s                 |(5/2+)#
 34  53 C   |Se-87   |5.4 s                      |
 34  54 AB  |Se-88   |1.53(6) s                  |0+
 34  54 C   |Se-88   |1.5 s                      |
 34  55 AB  |Se-89   |0.41(4) s                  |(5/2+)#
 34  55 C   |Se-89   |0.41 s                     |
 34  56 A   |Se-90   |300# ms [>300 ns]          |0+
 34  56 B   |Se-90   |>150 ns                    |0+
 34  56 C   |Se-90   |>0.15 µs                   |
 34  57 A   |Se-91   |270(50) ms                 |1/2+#
 34  57 BC  |Se-91   |0.27(5) s                  |
 34  58 A   |Se-92   |100# ms [>300 ns]          |0+
 34  58 B   |Se-92   |>300 ns                    |0+
 34  58 C   |Se-92   |>0.15 µs                   |
 34  59 A   |Se-93   |50# ms [>300 ns]           |1/2+#
 34  59 B   |Se-93   |>150 ns                    |(1/2+)
 34  59 C   |Se-93   |>0.15 µs                   |
 34  60 A   |Se-94   |20# ms [>300 ns]           |0+
 34  60 B   |Se-94   |>150 ns                    |0+
 34  60 C   |Se-94   |>0.15 µs                   |

Femto 13:59, 14 November 2005 (UTC)

Contents

TalkEdit


Se-79 halflifeEdit

Elsewhere it is reported as 1.13 million years and other figures. Is one figure newer or more accurate? --JWB 07:06, 9 May 2007 (UTC)

Remeasurement of the Half-Life of 79Se with the Projectile X-Ray Detection Method from 2001 gives (2.95 ± 0.38) × 105 y (the figure already in this article but not in Selenium) as a new measurement superseding 1.1 × 106 y. --JWB 10:00, 9 May 2007 (UTC)
To the best of my knowledge, the value of (2.95 ± 0.38) × 105 y is the state-of-the-art figure for the halflife of 79Se. This value is presently used for the safety calculations in the Belgian program for radioactive waste disposal in Boom Clay. Shinkolobwe (talk) 10:29, 12 May 2008 (UTC)
Great, are there any references using the updated halflife? Also, I'm curious what yield is being assumed for 79Se; I didn't find that in the previous reference. --JWB (talk) 22:28, 12 May 2008 (UTC)

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