نظائر راديوم جميع نظائرعنصر الراديوم Ra نظائرمشعه , نظير 226Ra هوالأكثر شوعا و عمر نصف له 1600 سنة , ومن خلال سلسلة تفكك ينتج يورانيوم 238 238U .[1]
جدول
رمز النواة
|
الاسم
|
p
|
n
|
كتلة النظير (u)
|
عمر النصف
|
نمط الإضمحلال
|
نواة وليدة
|
لف مغزلي
|
كسر مولي
|
نطاق طبيعي
|
طاقة الإثارة
|
202Ra
|
|
88
|
114
|
202.00989(7)
|
2.6(21) ms [0.7(+33-3) ms]
|
|
|
0+
|
|
|
203Ra
|
|
88
|
115
|
203.00927(9)
|
4(3) ms
|
اضمحلال ألفا
|
199Rn
|
(3/2-)
|
|
|
اضمحلال بيتا (rare)
|
203Fr
|
203mRa
|
|
220(90) keV
|
41(17) ms
|
α
|
199Rn
|
(13/2+)
|
|
|
β+
|
203Fr
|
204Ra
|
|
88
|
116
|
204.006500(17)
|
60(11) ms [59(+12-9) ms]
|
α 99.7%
|
200Rn
|
0+
|
|
|
β+ .3%
|
204Fr
|
205Ra
|
|
88
|
117
|
205.00627(9)
|
220(40) ms [210(+60-40) ms]
|
α
|
201Rn
|
(3/2-)
|
|
|
β+ (rare)
|
205Fr
|
205mRa
|
|
310(110)# keV
|
180(50) ms [170(+60-40) ms]
|
α
|
201Rn
|
(13/2+)
|
|
|
مصاوغ نووي (rare)
|
205Ra
|
206Ra
|
|
88
|
118
|
206.003827(19)
|
0.24(2) s
|
α
|
202Rn
|
0+
|
|
|
207Ra
|
|
88
|
119
|
207.00380(6)
|
1.3(2) s
|
α 90%
|
203Rn
|
(5/2-,3/2-)
|
|
|
β+ 10%
|
207Fr
|
207mRa
|
|
560(50) keV
|
57(8) ms
|
85%
|
207Ra
|
(13/2+)
|
|
|
α 15%
|
203Rn
|
β+ .55%
|
207Fr
|
208Ra
|
|
88
|
120
|
208.001840(17)
|
1.3(2) s
|
α 95%
|
204Rn
|
0+
|
|
|
β+ 5%
|
208Fr
|
208mRa
|
|
1800(200) keV
|
270 ns
|
|
|
(8+)
|
|
|
209Ra
|
|
88
|
121
|
209.00199(5)
|
4.6(2) s
|
α 90%
|
205Rn
|
5/2-
|
|
|
β+ 10%
|
209Fr
|
210Ra
|
|
88
|
122
|
210.000495(16)
|
3.7(2) s
|
α 96%
|
206Rn
|
0+
|
|
|
β+ 4%
|
210Fr
|
210mRa
|
|
1800(200) keV
|
2.24 µs
|
|
|
(8+)
|
|
|
211Ra
|
|
88
|
123
|
211.000898(28)
|
13(2) s
|
α 97%
|
207Rn
|
5/2(-)
|
|
|
β+ 3%
|
211Fr
|
212Ra
|
|
88
|
124
|
211.999794(12)
|
13.0(2) s
|
α 85%
|
208Rn
|
0+
|
|
|
β+ 15%
|
212Fr
|
212m1Ra
|
|
1958.4(5) keV
|
10.9(4) µs
|
|
|
(8)+
|
|
|
212m2Ra
|
|
2613.4(5) keV
|
0.85(13) µs
|
|
|
(11)-
|
|
|
213Ra
|
|
88
|
125
|
213.000384(22)
|
2.74(6) min
|
α 80%
|
209Rn
|
1/2-
|
|
|
β+ 20%
|
213Fr
|
213mRa
|
|
1769(6) keV
|
2.1(1) ms
|
99%
|
213Ra
|
17/2-#
|
|
|
α 1%
|
209Rn
|
214Ra
|
|
88
|
126
|
214.000108(10)
|
2.46(3) s
|
α 99.94%
|
210Rn
|
0+
|
|
|
β+ .06%
|
214Fr
|
215Ra
|
|
88
|
127
|
215.002720(8)
|
1.55(7) ms
|
α
|
211Rn
|
(9/2+)#
|
|
|
215m1Ra
|
|
1877.8(5) keV
|
7.1(2) µs
|
|
|
(25/2+)
|
|
|
215m2Ra
|
|
2246.9(5) keV
|
1.39(7) µs
|
|
|
(29/2-)
|
|
|
215m3Ra
|
|
3756.6(6)+X keV
|
0.555(10) µs
|
|
|
(43/2-)
|
|
|
216Ra
|
|
88
|
128
|
216.003533(9)
|
182(10) ns
|
α
|
212Rn
|
0+
|
|
|
1×10−8%
|
216Fr
|
217Ra
|
|
88
|
129
|
217.006320(9)
|
1.63(17) µs
|
α
|
213Rn
|
(9/2+)
|
|
|
218Ra
|
|
88
|
130
|
218.007140(12)
|
25.2(3) µs
|
α
|
214Rn
|
0+
|
|
|
β+β+ (rare)
|
218Rn
|
219Ra
|
|
88
|
131
|
219.010085(9)
|
10(3) ms
|
α
|
215Rn
|
(7/2)+
|
|
|
220Ra
|
|
88
|
132
|
220.011028(10)
|
17.9(14) ms
|
α
|
216Rn
|
0+
|
|
|
221Ra
|
|
88
|
133
|
221.013917(5)
|
28(2) s
|
α
|
217Rn
|
5/2+
|
|
|
1.2×10−10%
|
207Pb 14C
|
222Ra
|
|
88
|
134
|
222.015375(5)
|
38.0(5) s
|
α
|
218Rn
|
0+
|
|
|
3×10−8%
|
208Pb 14C
|
223Ra
|
Actinium X
|
88
|
135
|
223.0185022(27)
|
11.43(5) d
|
α
|
219Rn
|
3/2+
|
|
|
6.4×10−8%
|
209Pb 14C
|
224Ra
|
Thorium X
|
88
|
136
|
224.0202118(24)
|
3.6319(23) d
|
α
|
220Rn
|
0+
|
|
|
4.3×10−9%
|
210Pb 14C
|
225Ra
|
|
88
|
137
|
225.023612(3)
|
14.9(2) d
|
β-
|
225Ac
|
1/2+
|
|
|
226Ra
|
Radium
|
88
|
138
|
226.0254098(25)
|
1600(7) y
|
α
|
222Rn
|
0+
|
|
|
β-β- (rare)
|
226Th
|
2.6×10−9%
|
212Pb 14C
|
227Ra
|
|
88
|
139
|
227.0291778(25)
|
42.2(5) min
|
β-
|
227Ac
|
3/2+
|
|
|
228Ra
|
Mesothorium 1
|
88
|
140
|
228.0310703(26)
|
5.75(3) y
|
β-
|
228Ac
|
|
|
229Ra
|
|
88
|
141
|
229.034958(20)
|
4.0(2) min
|
β-
|
229Ac
|
5/2(+)
|
|
|
230Ra
|
|
88
|
142
|
230.037056(13)
|
93(2) min
|
β-
|
230Ac
|
0+
|
|
|
231Ra
|
|
88
|
143
|
231.04122(32)#
|
103(3) s
|
β-
|
231Ac
|
(5/2+)
|
|
|
231mRa
|
|
66.21(9) keV
|
~53 µs
|
|
|
(1/2+)
|
|
|
232Ra
|
|
88
|
144
|
232.04364(30)#
|
250(50) s
|
β-
|
232Ac
|
0+
|
|
|
233Ra
|
|
88
|
145
|
233.04806(50)#
|
30(5) s
|
β-
|
233Ac
|
1/2+#
|
|
|
234Ra
|
|
88
|
146
|
234.05070(53)#
|
30(10) s
|
β-
|
234Ac
|
0+
|
|
|
المراجع
- Isotope masses from:
- Isotopic compositions and standard atomic masses from:
- Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.