鉀（原子質量單位：390983 1）共有 28 個同位素，其中有 2 個是穩定的。 圖表 styletextalignright 19 styletextalignright 12 10 ps 3p 28S 34K styletextalignright 19 styletextalignright 15 33998404 18 p 33Ar rowspan235K rowspan2 styletextalignright 19 rowspan2 styletextalignright 16 rowspan234988010 21 rowspan2178 8 ms β 9963 35Ar rowspan232 rowspan2 β p 37 34Cl rowspan336K rowspan3 styletextalignright 19 rowspan3 styletextalignright 17 rowspan335981292 8 rowspan3342 2 ms β 9994 36Ar rowspan32 rowspan3 β p 048 35Cl β α 012 32S 37K styletextalignright 19 styletextalignright 18 3697337589 10 1226 7 s β 37Ar 32 38K styletextalignright 19 styletextalignright 19 379690812 5 7636 18 min β 38Ar 3 styletextindent1em 38m1K colspan3 styletextindent2em 13050 28 keV 9242 3 ms 0 styletextindent1em 38m2K colspan3 styletextindent2em 34580 2 keV 2198 11 µs 75 styletextalignright 19 styletextalignright 20 3896370668 20 colspan3 aligncenter 32 0932581 44 rowspan3 用於鉀－氬年代測定法放射性核素 rowspan3 styletextalignright 19 rowspan3 styletextalignright 21 rowspan33996399848 21 rowspan31248 3109 y β 8928 40Ca rowspan34 rowspan3117 1104 EC 1072 rowspan240Ar β 0001 styletextindent1em 40mK colspan3 styletextindent2em 1643639 11 keV 336 12 ns 0 41K styletextalignright 19 styletextalignright 22 4096182576 21 colspan3 aligncenter 穩定 32 0067302 44 42K styletextalignright 19 styletextalignright 23 4196240281 24 12360 12 h β 42Ca 2 43K styletextalignright 19 styletextalignright 24 42960716 10 223 1 h β 43Ca 32 44K styletextalignright 19 styletextalignright 25 4396156 4 2213 19 min β 44Ca 2 45K styletextalignright 19 styletextalignright 26 44960699 11 173 6 min β 45Ca 32 46K styletextalignright 19 styletextalignright 27 45961977 17 105 10 s β 46Ca 2 47K styletextalignright 19 styletextalignright 28 46961678 9 1750 24 s β 47Ca 12 rowspan248K rowspan2 styletextalignright 19 rowspan2 styletextalignright 29 rowspan247965514 26 rowspan268 2 s β 9886 48Ca rowspan22 rowspan2 β n 114 47Ca rowspan249K rowspan2 styletextalignright 19 rowspan2 styletextalignright 30 rowspan24896745 8 rowspan2126 5 s β n 86 48Ca rowspan232 rowspan2 β 14 49Ca rowspan250K rowspan2 styletextalignright 19 rowspan2 styletextalignright 31 rowspan24997278 30 rowspan2472 4 ms β 71 50Ca rowspan2012 rowspan2 β n 29 49Ca rowspan251K rowspan2 styletextalignright 19 rowspan2 styletextalignright 32 rowspan25097638 54 rowspan2365 5 ms β 53 51Ca rowspan232 rowspan2 β n 47 50Ca rowspan352K rowspan3 styletextalignright 19 rowspan3 styletextalignright 33 rowspan35198261 75 rowspan3105 5 ms β n 64 51Ca rowspan32 rowspan3 β 2n 21 50Ca β 15 52Ca rowspan353K rowspan3 styletextalignright 19 rowspan3 styletextalignright 34 rowspan35298712 75 rowspan330 5 ms β n 67 52Ca rowspan332 rowspan3 β 2n 17 51Ca β 16 53Ca rowspan254K rowspan2 styletextalignright 19 rowspan2 styletextalignright 35 rowspan25399420 97 rowspan210 5 ms β 999 54Ca rowspan22 rowspan2 β n 1 53Ca rowspan255K rowspan2 styletextalignright 19 rowspan2 styletextalignright 36 rowspan25499971 107 rowspan23 ms β 55Ca rowspan232 rowspan2 β n 54Ca rowspan256K rowspan2 styletextalignright 19 rowspan2 styletextalignright 37 rowspan25600851 86 rowspan21 ms β 56Ca rowspan22 rowspan2 β n 55Ca 57K styletextalignright 19 styletextalignright 38 β 57Ca 59K 未確認的同位素 styletextalignright 19 styletextalignright 40 β 59Ca 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 K Category 鉀