루비듐 동위 원소

자연계에는 존재하는 루비듐의 동위 원소는 2종이며 ⁸⁵Rb와 ⁸⁷Rb이 존재하고 있다. 여기서 ⁸⁵Rb는 안정 동위 원소이며, ⁸⁷Rb는 반감기가 492억 3천만년의 긴 반감기를 가진 방사성 동위 원소이다.

루비듐-87은 스트론튬-87로 붕괴하며, 루비듐-스트론튬 연대 측정에 이용된다.

표

핵자 수	Z(p)	N(n)	동위 원소 질량 (u)	반감기	붕괴 방식	붕괴 생성 동위 원소	핵 스핀	자연계에 존재하는 동위 원소 범위 (몰 분율)	자연계에 존재하는 최대 범위 (몰 분율)
	들뜬 에너지
71Rb	37	34	70.96532(54)#		p	70Kr	5/2-#
72Rb	37	35	71.95908(54)#	<1.5 µs	p	71Kr	3+#
72mRb	100(100)# keV			1# µs	p	71Kr	1-#
73Rb	37	36	72.95056(16)#	<30 ns	p	72Kr	3/2-#
74Rb	37	37	73.944265(4)	64.76(3) ms	β+	74Kr	(0+)
75Rb	37	38	74.938570(8)	19.0(12) s	β+	75Kr	(3/2-)
76Rb	37	39	75.9350722(20)	36.5(6) s	β+	76Kr	1(-)
					β+, α (3.8×10−7%)	72Se
76mRb	316.93(8) keV			3.050(7) µs			(4+)
77Rb	37	40	76.930408(8)	3.77(4) min	β+	77Kr	3/2-
78Rb	37	41	77.928141(8)	17.66(8) min	β+	78Kr	0(+)
78mRb	111.20(10) keV			5.74(5) min	β+ (90%)	78Kr	4(-)
					IT (10%)	78Rb
79Rb	37	42	78.923989(6)	22.9(5) min	β+	79Kr	5/2+
80Rb	37	43	79.922519(7)	33.4(7) s	β+	80Kr	1+
80mRb	494.4(5) keV			1.6(2) µs			6+
81Rb	37	44	80.918996(6)	4.570(4) h	β+	81Kr	3/2-
81mRb	86.31(7) keV			30.5(3) min	IT (97.6%)	81Rb	9/2+
					β+ (2.4%)	81Kr
82Rb	37	45	81.9182086(30)	1.273(2) min	β+	82Kr	1+
82mRb	69.0(15) keV			6.472(5) h	β+ (99.67%)	82Kr	5-
					IT (.33%)	82Rb
83Rb	37	46	82.915110(6)	86.2(1) d	ε	83Kr	5/2-
83mRb	42.11(4) keV			7.8(7) ms	IT	83Rb	9/2+
84Rb	37	47	83.914385(3)	33.1(1) d	β+ (96.2%)	84Kr	2-
					β- (3.8%)	84Sr
84mRb	463.62(9) keV			20.26(4) min	IT (>99.9%)	84Rb	6-
					β+ (<.1%)	84Kr
85Rb	37	48	84.911789738(12)	안정			5/2-	0.7217(2)
86Rb	37	49	85.91116742(21)	18.642(18) d	β- (99.9948%)	86Sr	2-
					ε (.0052%)	86Kr
86mRb	556.05(18) keV			1.017(3) min	IT	86Rb	6-
87Rb	37	50	86.909180527(13)	4.923(22)×1010 a	β-	87Sr	3/2-	0.2783(2)
88Rb	37	51	87.91131559(17)	17.773(11) min	β-	88Sr	2-
89Rb	37	52	88.912278(6)	15.15(12) min	β-	89Sr	3/2-
90Rb	37	53	89.914802(7)	158(5) s	β-	90Sr	0-
90mRb	106.90(3) keV			258(4) s	β- (97.4%)	90Sr	3-
					IT (2.6%)	90 Rb
91Rb	37	54	90.916537(9)	58.4(4) s	β-	91Sr	3/2(-)
92Rb	37	55	91.919729(7)	4.492(20) s	β- (99.98%)	92Sr	0-
					β-, n (.0107%)	91Sr
93Rb	37	56	92.922042(8)	5.84(2) s	β- (98.65%)	93Sr	5/2-
					β-, n (1.35%)	92Sr
93mRb	253.38(3) keV			57(15) µs			(3/2-,5/2-)
94Rb	37	57	93.926405(9)	2.702(5) s	β- (89.99%)	94Sr	3(-)
					β-, n (10.01%)	93Sr
95Rb	37	58	94.929303(23)	377.5(8) ms	β- (91.27%)	95Sr	5/2-
					β-, n (8.73%)	94Sr
96Rb	37	59	95.93427(3)	202.8(33) ms	β- (86.6%)	96Sr	2+
					β-, n (13.4%)	95Sr
96mRb	0(200)# keV			200# ms [>1 ms]	β-	96Sr	1(-#)
					IT	96Rb
					β-, n	95Sr
97Rb	37	60	96.93735(3)	169.9(7) ms	β- (74.3%)	97Sr	3/2+
					β-, n (25.7%)	96Sr
98Rb	37	61	97.94179(5)	114(5) ms	β-(86.14%)	98Sr	(0,1)(-#)
					β-, n (13.8%)	97Sr
					β-, 2n (.051%)	96Sr
98mRb	290(130) keV			96(3) ms	β-	97Sr	(3,4)(+#)
99Rb	37	62	98.94538(13)	50.3(7) ms	β- (84.1%)	99Sr	(5/2+)
					β-, n (15.9%)	98Sr
100Rb	37	63	99.94987(32)#	51(8) ms	β- (94.25%)	100Sr	(3+)
					β-, n (5.6%)	99Sr
					β-, 2n (.15%)	98Sr
101Rb	37	64	100.95320(18)	32(5) ms	β- (69%)	101Sr	(3/2+)#
					β-, n (31%)	100Sr
102Rb	37	65	101.95887(54)#	37(5) ms	β- (82%)	102Sr
					β-, n (18%)	101Sr