砷（原子量：74921595 6）共有 43 個同位素，其中有 1 個同位素是穩定的。 圖表 60As styletextalignright 33 styletextalignright 27 5999313 64 59Ge 5 61As styletextalignright 33 styletextalignright 28 6098062 64 60Ge 32 62As styletextalignright 33 styletextalignright 29 6197320 32 61Ge 1 63As styletextalignright 33 styletextalignright 30 6296369 54 62Ge 32 64As styletextalignright 33 styletextalignright 31 6395757 38 40 30 ms 18 437 ms 64Ge 0 65As styletextalignright 33 styletextalignright 32 6494956 32 170 30 ms 65Ge 32 66As styletextalignright 33 styletextalignright 33 6594471 73 9577 23 ms 66Ge 0 styletextindent1em 66m1As colspan3 styletextindent2em 135670 17 keV 11 1 µs 5 styletextindent1em 66m2As colspan3 styletextindent2em 30239 3 keV 82 5 µs 9 67As styletextalignright 33 styletextalignright 34 6693919 11 425 12 s 67Ge 52 68As styletextalignright 33 styletextalignright 35 6793677 5 1516 8 s 68Ge 3 styletextindent1em 68mAs colspan3 styletextindent2em 42521 16 keV 111 20 ns 107 2316 ns 1 69As styletextalignright 33 styletextalignright 36 6893227 3 152 2 min 69Ge 52 70As styletextalignright 33 styletextalignright 37 6993092 5 526 3 min 70Ge 4 styletextindent1em 70mAs colspan3 styletextindent2em 32008 23 keV 96 3 µs 2 71As styletextalignright 33 styletextalignright 38 70927112 5 6528 15 h 71Ge 52 72As styletextalignright 33 styletextalignright 39 71926752 5 260 1 h 72Ge 2 73As styletextalignright 33 styletextalignright 40 72923825 4 8030 6 d 73Ge 32 rowspan274As rowspan2 styletextalignright 33 rowspan2 styletextalignright 41 rowspan2739239287 25 rowspan21777 2 d 66 74Ge rowspan22 rowspan2 34 74Se styletextalignright 33 styletextalignright 42 749215965 20 colspan3 aligncenter 32 10000 styletextindent1em 75mAs colspan3 styletextindent2em 3039241 7 keV 1762 23 ms 92 rowspan276As rowspan2 styletextalignright 33 rowspan2 styletextalignright 43 rowspan275922394 2 rowspan210942 7 d 9998 76Se rowspan22 rowspan2 02 76Ge styletextindent1em 76mAs colspan3 styletextindent2em 44425 1 keV 184 6 µs 1 77As styletextalignright 33 styletextalignright 44 769206473 25 3883 5 h 77mSe 32 styletextindent1em 77mAs colspan3 styletextindent2em 475443 16 keV 1140 25 µs 92 78As styletextalignright 33 styletextalignright 45 77921827 11 907 2 min 78Se 2 79As styletextalignright 33 styletextalignright 46 78920948 6 901 15 min 79mSe 32 styletextindent1em 79mAs colspan3 styletextindent2em 77281 6 keV 121 1 µs 92 80As styletextalignright 33 styletextalignright 47 79922534 25 152 2 s 80Se 1 81As styletextalignright 33 styletextalignright 48 80922132 6 333 8 s 81mSe 32 82As styletextalignright 33 styletextalignright 49 8192450 21 191 5 s 82Se 1 styletextindent1em 82mAs colspan3 styletextindent2em 250 200 keV 136 4 s 82Se 5 83As styletextalignright 33 styletextalignright 50 8292498 24 134 3 s 83mSe 32 rowspan284As rowspan2 styletextalignright 33 rowspan2 styletextalignright 51 rowspan28392906 32 rowspan2402 3 s 99721 84Se rowspan23 rowspan2 029 83Se styletextindent1em 84mAs colspan3 styletextindent2em 0 100 keV 650 150 ms rowspan285As rowspan2 styletextalignright 33 rowspan2 styletextalignright 52 rowspan28493202 21 rowspan22021 10 s 594 84Se rowspan232 rowspan2 406 85Se rowspan286As rowspan2 styletextalignright 33 rowspan2 styletextalignright 53 rowspan28593650 32 rowspan20945 8 s 67 86Se rowspan2 rowspan2 33 85Se rowspan287As rowspan2 styletextalignright 33 rowspan2 styletextalignright 54 rowspan28693990 32 rowspan2056 8 s 846 87Se rowspan232 rowspan2 154 86Se rowspan288As rowspan2 styletextalignright 33 rowspan2 styletextalignright 55 rowspan28794494 54 rowspan2300 ms 300 ns 88Se rowspan2 rowspan2 87Se 89As styletextalignright 33 styletextalignright 56 8894939 54 200 ms 300 ns 89Se 32 90As styletextalignright 33 styletextalignright 57 8995550 86 80 ms 300 ns 91As styletextalignright 33 styletextalignright 58 9096043 97 50 ms 300 ns 32 92As styletextalignright 33 styletextalignright 59 9196680 97 30 ms 300 ns 參考文獻 Isotope masses from Ame2003 Atomic Mass Evaluation by G Audi AH Wapstra C Thibault J Blachot and O Bersillon in Nuclear Physics A729 2003 Halflife spin and isomer data selected from these sources Editing notes on this articles talk page Audi Bersillon Blachot Wapstra The Nubase2003 evaluation of nuclear and decay properties Nuc Phys A 729 pp 3128 2003 National Nuclear Data Center Brookhaven National Laboratory Information extracted from the NuDat 21 database retrieved Sept 2005 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 As Category 砷