{{위키데이터 속성 추적}}
'''[[라듐]]'''은 [[안정 동위 원소]]가 존재하지 않으며, 오직 [[방사성 동위 원소]]로만 구성되어 있다. 따라서, 라듐의 표준 원자량은 정해져 있지 않다. 자연에서 가장 흔하고 반감기가 가장 긴 라듐 동위 원소는 <sup>226</sup>Ra으로 [[반감기]]는 약 1600년이며, [[우라늄-238|<sup>238</sup>U]]의 [[붕괴 계열#라듐 계열 (우라늄 계열)|붕괴 계열]] 상에 위치한다. 이 밖에 라듐은 원자량 202에서 234 사이에 총 33개의 동위 원소가 알려져 있다.

== 표 ==
{| class="wikitable" style="font-size:95%; white-space:nowrap"
! rowspan="2" | 핵종<br />기호
! rowspan="2" | 과거 명칭
! Z([[양성자|p]])
! N([[중성자|n]])
! &nbsp;<br />동위 원소 질량 (u)<br />&nbsp;
! rowspan="2" | 반감기
! rowspan="2" | 붕괴<br />방식<ref>http://www.nucleonica.net/unc.aspx</ref><ref group="n">약자:<br />CD: [[뭉치 붕괴]]<br />ε: [[전자 포획]]<br />IT: [[이성질핵 전이]]</ref>
! rowspan="2" | 붕괴<br />생성물<ref group="n">굵은 글꼴은 안정 동위 원소</ref>
! rowspan="2" | 핵<br />스핀
! rowspan="2" | 전형적<br />동위 원소<br />구성비<br />(몰 분율)
! rowspan="2" | 자연적<br />구성비<br />변동 범위<br />(몰 분율)
|-
! colspan="3" | 들뜬 에너지
|-
| <sup>202</sup>Ra
|
| style="text-align:right" | 88
| style="text-align:right" | 114
| 202.00989(7)
| 2.6(21) ms<br />[0.7(+33-3) ms]
|
|
| 0+
|
|
|-
| rowspan=2|<sup>203</sup>Ra
| rowspan=2|
| rowspan=2 style="text-align:right" | 88
| rowspan=2 style="text-align:right" | 115
| rowspan=2|203.00927(9)
| rowspan=2|4(3) ms
| [[알파 붕괴|α]]
| <sup>199</sup>Rn
| rowspan=2|(3/2-)
| rowspan=2|
| rowspan=2|
|-
| [[베타 붕괴|β<sup>+</sup>]] (드묾)
| <sup>203</sup>Fr
|-
| rowspan=2 style="text-indent:1em" | <sup>203m</sup>Ra
| rowspan=2|
| rowspan=2 colspan="3" style="text-indent:2em" | 220(90) keV
| rowspan=2|41(17) ms
| α
| <sup>199</sup>Rn
| rowspan=2|(13/2+)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (드묾)
| <sup>203</sup>Fr
|-
| rowspan=2|<sup>204</sup>Ra
| rowspan=2|
| rowspan=2 style="text-align:right" | 88
| rowspan=2 style="text-align:right" | 116
| rowspan=2|204.006500(17)
| rowspan=2|60(11) ms<br />[59(+12-9) ms]
| α (99.7%)
| <sup>200</sup>Rn
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (0.3%)
| <sup>204</sup>Fr
|-
| rowspan=2|<sup>205</sup>Ra
| rowspan=2|
| rowspan=2 style="text-align:right" | 88
| rowspan=2 style="text-align:right" | 117
| rowspan=2|205.00627(9)
| rowspan=2|220(40) ms<br />[210(+60-40) ms]
| α
| <sup>201</sup>Rn
| rowspan=2|(3/2-)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (드묾)
| <sup>205</sup>Fr
|-
| rowspan=2 style="text-indent:1em" | <sup>205m</sup>Ra
| rowspan=2|
| rowspan=2 colspan="3" style="text-indent:2em" | 310(110)# keV
| rowspan=2|180(50) ms<br />[170(+60-40) ms]
| α
| <sup>201</sup>Rn
| rowspan=2|(13/2+)
| rowspan=2|
| rowspan=2|
|-
| [[이성질핵 전이|IT]] (드묾)
| <sup>205</sup>Ra
|-
| <sup>206</sup>Ra
|
| style="text-align:right" | 88
| style="text-align:right" | 118
| 206.003827(19)
| 0.24(2) s
| α
| <sup>202</sup>Rn
| 0+
|
|
|-
| rowspan=2|<sup>207</sup>Ra
| rowspan=2|
| rowspan=2 style="text-align:right" | 88
| rowspan=2 style="text-align:right" | 119
| rowspan=2|207.00380(6)
| rowspan=2|1.3(2) s
| α (90%)
| <sup>203</sup>Rn
| rowspan=2|(5/2-,3/2-)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (10%)
| <sup>207</sup>Fr
|-
| rowspan=3 style="text-indent:1em" | <sup>207m</sup>Ra
| rowspan=3|
| rowspan=3 colspan="3" style="text-indent:2em" | 560(50) keV
| rowspan=3|57(8) ms
| IT (85%)
| <sup>207</sup>Ra
| rowspan=3|(13/2+)
| rowspan=3|
| rowspan=3|
|-
| α (15%)
| <sup>203</sup>Rn
|-
| β<sup>+</sup> (0.55%)
| <sup>207</sup>Fr
|-
| rowspan=2|<sup>208</sup>Ra
| rowspan=2|
| rowspan=2 style="text-align:right" | 88
| rowspan=2 style="text-align:right" | 120
| rowspan=2|208.001840(17)
| rowspan=2|1.3(2) s
| α (95%)
| <sup>204</sup>Rn
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (5%)
| <sup>208</sup>Fr
|-
| style="text-indent:1em" | <sup>208m</sup>Ra
|
| colspan="3" style="text-indent:2em" | 1800(200) keV
| 270 ns
|
|
| (8+)
|
|
|-
| rowspan=2|<sup>209</sup>Ra
| rowspan=2|
| rowspan=2 style="text-align:right" | 88
| rowspan=2 style="text-align:right" | 121
| rowspan=2|209.00199(5)
| rowspan=2|4.6(2) s
| α (90%)
| <sup>205</sup>Rn
| rowspan=2|5/2-
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (10%)
| <sup>209</sup>Fr
|-
| rowspan=2|<sup>210</sup>Ra
| rowspan=2|
| rowspan=2 style="text-align:right" | 88
| rowspan=2 style="text-align:right" | 122
| rowspan=2|210.000495(16)
| rowspan=2|3.7(2) s
| α (96%)
| <sup>206</sup>Rn
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (4%)
| <sup>210</sup>Fr
|-
| style="text-indent:1em" | <sup>210m</sup>Ra
|
| colspan="3" style="text-indent:2em" | 1800(200) keV
| 2.24 µs
|
|
| (8+)
|
|
|-
| rowspan=2|<sup>211</sup>Ra
| rowspan=2|
| rowspan=2 style="text-align:right" | 88
| rowspan=2 style="text-align:right" | 123
| rowspan=2|211.000898(28)
| rowspan=2|13(2) s
| α (97%)
| <sup>207</sup>Rn
| rowspan=2|5/2(-)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (3%)
| <sup>211</sup>Fr
|-
| rowspan=2|<sup>212</sup>Ra
| rowspan=2|
| rowspan=2 style="text-align:right" | 88
| rowspan=2 style="text-align:right" | 124
| rowspan=2|211.999794(12)
| rowspan=2|13.0(2) s
| α (85%)
| <sup>208</sup>Rn
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (15%)
| <sup>212</sup>Fr
|-
| style="text-indent:1em" | <sup>212m1</sup>Ra
|
| colspan="3" style="text-indent:2em" | 1958.4(5) keV
| 10.9(4) µs
|
|
| (8)+
|
|
|-
| style="text-indent:1em" | <sup>212m2</sup>Ra
|
| colspan="3" style="text-indent:2em" | 2613.4(5) keV
| 0.85(13) µs
|
|
| (11)-
|
|
|-
| rowspan=2|<sup>213</sup>Ra
| rowspan=2|
| rowspan=2 style="text-align:right" | 88
| rowspan=2 style="text-align:right" | 125
| rowspan=2|213.000384(22)
| rowspan=2|2.74(6) min
| α (80%)
| <sup>209</sup>Rn
| rowspan=2|1/2-
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (20%)
| <sup>213</sup>Fr
|-
| rowspan=2 style="text-indent:1em" | <sup>213m</sup>Ra
| rowspan=2|
| rowspan=2 colspan="3" style="text-indent:2em" | 1769(6) keV
| rowspan=2|2.1(1) ms
| IT (99%)
| <sup>213</sup>Ra
| rowspan=2|17/2-#
| rowspan=2|
| rowspan=2|
|-
| α (1%)
| <sup>209</sup>Rn
|-
| rowspan=2|<sup>214</sup>Ra
| rowspan=2|
| rowspan=2 style="text-align:right" | 88
| rowspan=2 style="text-align:right" | 126
| rowspan=2|214.000108(10)
| rowspan=2|2.46(3) s
| α (99.94%)
| <sup>210</sup>Rn
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (0.06%)
| <sup>214</sup>Fr
|-
| <sup>215</sup>Ra
|
| style="text-align:right" | 88
| style="text-align:right" | 127
| 215.002720(8)
| 1.55(7) ms
| α
| <sup>211</sup>Rn
| (9/2+)#
|
|
|-
| style="text-indent:1em" | <sup>215m1</sup>Ra
|
| colspan="3" style="text-indent:2em" | 1877.8(5) keV
| 7.1(2) µs
|
|
| (25/2+)
|
|
|-
| style="text-indent:1em" | <sup>215m2</sup>Ra
|
| colspan="3" style="text-indent:2em" | 2246.9(5) keV
| 1.39(7) µs
|
|
| (29/2-)
|
|
|-
| style="text-indent:1em" | <sup>215m3</sup>Ra
|
| colspan="3" style="text-indent:2em" | 3756.6(6)+X keV
| 0.555(10) µs
|
|
| (43/2-)
|
|
|-
| rowspan=2|<sup>216</sup>Ra
| rowspan=2|
| rowspan=2 style="text-align:right" | 88
| rowspan=2 style="text-align:right" | 128
| rowspan=2|216.003533(9)
| rowspan=2|182(10) ns
| α
| <sup>212</sup>Rn
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| [[전자 포획|ε]] (1&times;10<sup>−8</sup>%)
| <sup>216</sup>Fr
|-
| <sup>217</sup>Ra
|
| style="text-align:right" | 88
| style="text-align:right" | 129
| 217.006320(9)
| 1.63(17) µs
| α
| <sup>213</sup>Rn
| (9/2+)
|
|
|-
| rowspan=2|<sup>218</sup>Ra
| rowspan=2|
| rowspan=2 style="text-align:right" | 88
| rowspan=2 style="text-align:right" | 130
| rowspan=2|218.007140(12)
| rowspan=2|25.2(3) µs
| α
| <sup>214</sup>Rn
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup>β<sup>+</sup> (드묾)
| <sup>218</sup>Rn
|-
| <sup>219</sup>Ra
|
| style="text-align:right" | 88
| style="text-align:right" | 131
| 219.010085(9)
| 10(3) ms
| α
| <sup>215</sup>Rn
| (7/2)+
|
|
|-
| <sup>220</sup>Ra
|
| style="text-align:right" | 88
| style="text-align:right" | 132
| 220.011028(10)
| 17.9(14) ms
| α
| <sup>216</sup>Rn
| 0+
|
|
|-
| rowspan=2|<sup>221</sup>Ra
| rowspan=2|
| rowspan=2 style="text-align:right" | 88
| rowspan=2 style="text-align:right" | 133
| rowspan=2|221.013917(5)
| rowspan=2|28(2) s
| α
| <sup>217</sup>Rn
| rowspan=2|5/2+
| rowspan=2|
| rowspan=2|
|-
| [[뭉치 붕괴|CD]] (1.2&times;10<sup>−10</sup>%)
| '''<sup>207</sup>Pb'''<br />[[탄소-14|<sup>14</sup>C]]
|-
| rowspan=2|<sup>222</sup>Ra
| rowspan=2|
| rowspan=2 style="text-align:right" | 88
| rowspan=2 style="text-align:right" | 134
| rowspan=2|222.015375(5)
| rowspan=2|38.0(5) s
| α
| <sup>218</sup>Rn
| rowspan=2|0+
| rowspan=2|미량<ref group="n"> [[우라늄-238|<sup>238</sup>U]]의 중간 [[붕괴 생성물]]</ref>
| rowspan=2|
|-
| CD (3&times;10<sup>−8</sup>%)
| '''<sup>208</sup>Pb'''<br /><sup>14</sup>C
|-
| rowspan=2|<sup>223</sup>Ra
| rowspan=2|[[악티늄]] X
| rowspan=2 style="text-align:right" | 88
| rowspan=2 style="text-align:right" | 135
| rowspan=2|223.0185022(27)
| rowspan=2|11.43(5) d
| α
| <sup>219</sup>Rn
| rowspan=2|3/2+
| rowspan=2|미량<ref group="n">[[우라늄-235|<sup>235</sup>U]]의 중간 [[붕괴 생성물]]</ref>
| rowspan=2|
|-
| CD (6.4&times;10<sup>−8</sup>%)
| <sup>209</sup>Pb<br /><sup>14</sup>C
|-
| rowspan=2|<sup>224</sup>Ra
| rowspan=2|[[토륨]] X
| rowspan=2 style="text-align:right" | 88
| rowspan=2 style="text-align:right" | 136
| rowspan=2|224.0202118(24)
| rowspan=2|3.6319(23) d
| α
| <sup>220</sup>Rn
| rowspan=2|0+
| rowspan=2|미량<ref group="n" name="ths"> [[토륨-232|<sup>232</sup>Th]]의 중간 [[붕괴 생성물]]</ref>
| rowspan=2|
|-
| CD (4.3&times;10<sup>−9</sup>%)
| <sup>210</sup>Pb<br /><sup>14</sup>C
|-
| <sup>225</sup>Ra
|
| style="text-align:right" | 88
| style="text-align:right" | 137
| 225.023612(3)
| 14.9(2) d
| β<sup>-</sup>
| <sup>225</sup>Ac
| 1/2+
|
|
|-
| rowspan=3|<sup>226</sup>Ra
| rowspan=3|라듐<ref group="n">여기서 원소 이름 '''라듐'''을 따온 것이다.</ref>
| rowspan=3 style="text-align:right" | 88
| rowspan=3 style="text-align:right" | 138
| rowspan=3|226.0254098(25)
| rowspan=3|1600(7) y
| α
| <sup>222</sup>Rn
| rowspan=3|0+
| rowspan=3|미량<ref group="n">[[우라늄-238|<sup>238</sup>U]]의 중간 [[붕괴 생성물]]</ref>
| rowspan=3|
|-
| β<sup>-</sup>β<sup>-</sup> (드묾)
| <sup>226</sup>Th
|-
| CD (2.6&times;10<sup>−9</sup>%)
| <sup>212</sup>Pb<br /><sup>14</sup>C
|-
| <sup>227</sup>Ra
|
| style="text-align:right" | 88
| style="text-align:right" | 139
| 227.0291778(25)
| 42.2(5) min
| β<sup>-</sup>
| <sup>227</sup>Ac
| 3/2+
|
|
|-
| <sup>228</sup>Ra
| 메소토륨 1
| style="text-align:right" | 88
| style="text-align:right" | 140
| 228.0310703(26)
| 5.75(3) y
| β<sup>-</sup>
| <sup>228</sup>Ac
| 0+
| 미량<ref group="n" name="ths" />
|
|-
| <sup>229</sup>Ra
|
| style="text-align:right" | 88
| style="text-align:right" | 141
| 229.034958(20)
| 4.0(2) min
| β<sup>-</sup>
| <sup>229</sup>Ac
| 5/2(+)
|
|
|-
| <sup>230</sup>Ra
|
| style="text-align:right" | 88
| style="text-align:right" | 142
| 230.037056(13)
| 93(2) min
| β<sup>-</sup>
| <sup>230</sup>Ac
| 0+
|
|
|-
| <sup>231</sup>Ra
|
| style="text-align:right" | 88
| style="text-align:right" | 143
| 231.04122(32)#
| 103(3) s
| β<sup>-</sup>
| <sup>231</sup>Ac
| (5/2+)
|
|
|-
| style="text-indent:1em" | <sup>231m</sup>Ra
|
| colspan="3" style="text-indent:2em" | 66.21(9) keV
| ~53 µs
|
|
| (1/2+)
|
|
|-
| <sup>232</sup>Ra
|
| style="text-align:right" | 88
| style="text-align:right" | 144
| 232.04364(30)#
| 250(50) s
| β<sup>-</sup>
| <sup>232</sup>Ac
| 0+
|
|
|-
| <sup>233</sup>Ra
|
| style="text-align:right" | 88
| style="text-align:right" | 145
| 233.04806(50)#
| 30(5) s
| β<sup>-</sup>
| <sup>233</sup>Ac
| 1/2+#
|
|
|-
| <sup>234</sup>Ra
|
| style="text-align:right" | 88
| style="text-align:right" | 146
| 234.05070(53)#
| 30(10) s
| β<sup>-</sup>
| <sup>234</sup>Ac
| 0+
|
|
|}

== 각주 ==
<references/>
; 내용주
<references group="n" />

{{동위 원소 색인}}
{{전거 통제}}

[[분류:라듐| 동위 원소]]
[[분류:라듐 동위 원소]]
[[분류:원소별 동위 원소 목록]]