To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

4,5
Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.
.
Leo
Newton
Brights
Milds

Isotopes of actinium

From Wikipedia, the free encyclopedia

Isotopes of actinium (89Ac)
Main isotopes[1] Decay
abun­dance half-life (t1/2) mode pro­duct
225Ac trace 9.919 d α 221Fr
14C 211Bi
226Ac synth 29.37 h β 226Th
ε 226Ra
α 222Fr
227Ac trace 21.772 y β 227Th
α 223Fr

Actinium (89Ac) has no stable isotopes and no characteristic terrestrial isotopic composition, thus a standard atomic weight cannot be given. There are 34 known isotopes, from 203Ac to 236Ac, and 7 isomers. Three isotopes are found in nature, 225Ac, 227Ac and 228Ac, as intermediate decay products of, respectively, 237Np, 235U, and 232Th. 228Ac and 225Ac are extremely rare, so almost all natural actinium is 227Ac.

The most stable isotopes are 227Ac with a half-life of 21.772 years, 225Ac with a half-life of 10.0 days, and 226Ac with a half-life of 29.37 hours. All other isotopes have half-lives under 10 hours, and most under a minute. The shortest-lived known isotope is 217Ac with a half-life of 69 ns.

Purified 227Ac comes into equilibrium with its decay products (227Th and 223Fr) after 185 days.[2]

YouTube Encyclopedic

  • 1/5
    Views:
    1 277
    4 458 800
    769 664
    198 084
    4 020
  • Actinium-225 A Cancer Fighting Medical Isotope, Hopeful in Curing Cancer
  • The Rarest Element on Earth
  • Half-Life Calculations: Radioactive Decay
  • What Radioactive Uranium Ore Looks Like
  • Uranium-238 Decay Series (Radioactivity)

Transcription

List of isotopes

Nuclide
[n 1]
Historic
name
Z N Isotopic mass (Da)
[n 2][n 3]
Half-life
Decay
mode

[n 4]
Daughter
isotope

[n 5]
Spin and
parity
[n 6][n 7]
Isotopic
abundance
Excitation energy[n 7]
203Ac[3] 89 114 56+269
−26
 μs
α 199Fr (1/2+)
204Ac[4] 89 115 7.4+2.2
−1.4
 ms
α 200Fr
205Ac[5] 89 116 7.7+2.7
−1.6
 ms
[4]
α 201Fr 9/2−?
206Ac 89 117 206.01450(8) 25(7) ms α 202Fr (3+)
206m1Ac 80(50) keV 15(6) ms α 202Fr
206m2Ac 290(110)# keV 41(16) ms α 202mFr (10−)
207Ac 89 118 207.01195(6) 31(8) ms
[27(+11−6) ms]
α 203Fr 9/2−#
208Ac 89 119 208.01155(6) 97(16) ms
[95(+24−16) ms]
α (99%) 204Fr (3+)
β+ (1%) 208Ra
208mAc 506(26) keV 28(7) ms
[25(+9−5) ms]
α (89%) 204Fr (10−)
IT (10%) 208Ac
β+ (1%) 208Ra
209Ac 89 120 209.00949(5) 92(11) ms α (99%) 205Fr (9/2−)
β+ (1%) 209Ra
210Ac 89 121 210.00944(6) 350(40) ms α (96%) 206Fr 7+#
β+ (4%) 210Ra
211Ac 89 122 211.00773(8) 213(25) ms α (99.8%) 207Fr 9/2−#
β+ (.2%) 211Ra
212Ac 89 123 212.00781(7) 920(50) ms α (97%) 208Fr 6+#
β+ (3%) 212Ra
213Ac 89 124 213.00661(6) 731(17) ms α 209Fr (9/2−)#
β+ (rare) 213Ra
214Ac 89 125 214.006902(24) 8.2(2) s α (89%) 210Fr (5+)#
β+ (11%) 214Ra
215Ac 89 126 215.006454(23) 0.17(1) s α (99.91%) 211Fr 9/2−
β+ (.09%) 215Ra
216Ac 89 127 216.008720(29) 0.440(16) ms α 212Fr (1−)
β+ (7×10−5%) 216Ra
216mAc 44(7) keV 443(7) µs (9−)
217Ac 89 128 217.009347(14) 69(4) ns α 213Fr 9/2−
β+ (6.9×10−9%) 217Ra
217mAc 2012(20) keV 740(40) ns (29/2)+
218Ac 89 129 218.01164(5) 1.08(9) µs α 214Fr (1−)#
218mAc 584(50)# keV 103(11) ns (11+)
219Ac 89 130 219.01242(5) 11.8(15) µs α 215Fr 9/2−
β+ (10−6%) 219Ra
220Ac 89 131 220.014763(16) 26.36(19) ms α 216Fr (3−)
β+ (5×10−4%) 220Ra
221Ac 89 132 221.01559(5) 52(2) ms α 217Fr 9/2−#
222Ac 89 133 222.017844(6) 5.0(5) s α (99%) 218Fr 1−
β+ (1%) 222Ra
222mAc 200(150)# keV 1.05(7) min α (88.6%) 218Fr high
IT (10%) 222Ac
β+ (1.4%) 222Ra
223Ac 89 134 223.019137(8) 2.10(5) min α (99%) 219Fr (5/2−)
EC (1%) 223Ra
CD (3.2×10−9%) 209Bi
14C
224Ac 89 135 224.021723(4) 2.78(17) h β+ (90.9%) 224Ra 0−
α (9.1%) 220Fr
β (1.6%) 224Th
225Ac[n 8] 89 136 225.023230(5) 10.0(1) d α 221Fr (3/2−) Trace[n 9]
CD (6×10−10%) 211Bi
14C
226Ac 89 137 226.026098(4) 29.37(12) h β (83%) 226Th (1)(−#)
EC (17%) 226Ra
α (.006%) 222Fr
227Ac Actinium[n 10] 89 138 227.0277521(26) 21.772(3) y β (98.62%) 227Th 3/2− Trace[n 11]
α (1.38%) 223Fr
228Ac Mesothorium 2 89 139 228.0310211(27) 6.13(2) h β 228Th 3+ Trace[n 12]
229Ac 89 140 229.03302(4) 62.7(5) min β 229Th (3/2+)
230Ac 89 141 230.03629(32) 122(3) s β 230Th (1+)
231Ac 89 142 231.03856(11) 7.5(1) min β 231Th (1/2+)
232Ac 89 143 232.04203(11) 119(5) s β 232Th (1+)
233Ac 89 144 233.04455(32)# 145(10) s β 233Th (1/2+)
234Ac 89 145 234.04842(43)# 44(7) s β 234Th
235Ac 89 146 235.05123(38)# 60(4) s β 235Th 1/2+#
236Ac[6] 89 147 236.05530(54)# 72+345
−33
 s
β 236Th
This table header & footer:
  1. ^ mAc – Excited nuclear isomer.
  2. ^ ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
  3. ^ # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
  4. ^ Modes of decay:
    CD: Cluster decay
    EC: Electron capture
    IT: Isomeric transition
  5. ^ Bold italics symbol as daughter – Daughter product is nearly stable.
  6. ^ ( ) spin value – Indicates spin with weak assignment arguments.
  7. ^ a b # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
  8. ^ Has medical uses
  9. ^ Intermediate decay product of 237Np
  10. ^ Source of element's name
  11. ^ Intermediate decay product of 235U
  12. ^ Intermediate decay product of 232Th

Actinides vs fission products

Actinides[7] by decay chain Half-life
range (a)
Fission products of 235U by yield[8]
4n 4n + 1 4n + 2 4n + 3 4.5–7% 0.04–1.25% <0.001%
228Ra 4–6 a 155Euþ
244Cmƒ 241Puƒ 250Cf 227Ac 10–29 a 90Sr 85Kr 113mCdþ
232Uƒ 238Puƒ 243Cmƒ 29–97 a 137Cs 151Smþ 121mSn
248Bk[9] 249Cfƒ 242mAmƒ 141–351 a

No fission products have a half-life in the range of 100 a–210 ka ...

241Amƒ 251Cfƒ[10] 430–900 a
226Ra 247Bk 1.3–1.6 ka
240Pu 229Th 246Cmƒ 243Amƒ 4.7–7.4 ka
245Cmƒ 250Cm 8.3–8.5 ka
239Puƒ 24.1 ka
230Th 231Pa 32–76 ka
236Npƒ 233Uƒ 234U 150–250 ka 99Tc 126Sn
248Cm 242Pu 327–375 ka 79Se
1.53 Ma 93Zr
237Npƒ 2.1–6.5 Ma 135Cs 107Pd
236U 247Cmƒ 15–24 Ma 129I
244Pu 80 Ma

... nor beyond 15.7 Ma[11]

232Th 238U 235Uƒ№ 0.7–14.1 Ga

See also

References

  1. ^ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
  2. ^ G. D. Considine, ed. (2005). "Chemical Elements". Van Nostrand's Encyclopedia of Chemistry. Wiley-Interscience. p. 332. ISBN 978-0-471-61525-5.
  3. ^ Wang, J. G.; Gan, Z. G.; Zhang, Z. Y.; et al. (1 March 2024). "α-decay properties of new neutron-deficient isotope 203Ac". Physics Letters B. 850: 138503. doi:10.1016/j.physletb.2024.138503. ISSN 0370-2693. Retrieved 6 February 2024.
  4. ^ a b Huang, M. H.; Gan, Z. G.; Zhang, Z. Y.; et al. (10 November 2022). "α decay of the new isotope 204Ac". Physics Letters B. 834: 137484. Bibcode:2022PhLB..83437484H. doi:10.1016/j.physletb.2022.137484. ISSN 0370-2693. S2CID 252730841.
  5. ^ Zhang, Z. Y.; Gan, Z. G.; Ma, L.; et al. (January 2014). "α decay of the new neutron-deficient isotope 205Ac". Physical Review C. 89 (1): 014308. Bibcode:2014PhRvC..89a4308Z. doi:10.1103/PhysRevC.89.014308.
  6. ^ Chen, L.; et al. (2010). "Discovery and investigation of heavy neutron-rich isotopes with time-resolved Schottky spectrometry in the element range from thallium to actinium" (PDF). Physics Letters B. 691 (5): 234–237. Bibcode:2010PhLB..691..234C. doi:10.1016/j.physletb.2010.05.078.
  7. ^ Plus radium (element 88). While actually a sub-actinide, it immediately precedes actinium (89) and follows a three-element gap of instability after polonium (84) where no nuclides have half-lives of at least four years (the longest-lived nuclide in the gap is radon-222 with a half life of less than four days). Radium's longest lived isotope, at 1,600 years, thus merits the element's inclusion here.
  8. ^ Specifically from thermal neutron fission of uranium-235, e.g. in a typical nuclear reactor.
  9. ^ Milsted, J.; Friedman, A. M.; Stevens, C. M. (1965). "The alpha half-life of berkelium-247; a new long-lived isomer of berkelium-248". Nuclear Physics. 71 (2): 299. Bibcode:1965NucPh..71..299M. doi:10.1016/0029-5582(65)90719-4.
    "The isotopic analyses disclosed a species of mass 248 in constant abundance in three samples analysed over a period of about 10 months. This was ascribed to an isomer of Bk248 with a half-life greater than 9 [years]. No growth of Cf248 was detected, and a lower limit for the β half-life can be set at about 104 [years]. No alpha activity attributable to the new isomer has been detected; the alpha half-life is probably greater than 300 [years]."
  10. ^ This is the heaviest nuclide with a half-life of at least four years before the "sea of instability".
  11. ^ Excluding those "classically stable" nuclides with half-lives significantly in excess of 232Th; e.g., while 113mCd has a half-life of only fourteen years, that of 113Cd is nearly eight quadrillion years.
This page was last edited on 12 February 2024, at 03:22
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.