砹的同位素

**主要的砹同位素**
α	205Bi
α	206Bi
α	207Bi
←Po（84）	Rn（86）→
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砹有33个已知的同位素，都具有放射性；它们的原子量从191到223。

图表

符号	Z（p ）	N（n ）	同位素质量（u）	半衰期^{[n 1]}	衰变方式^[1]^{[n 2]}	衰变产物^{[n 3]}	原子核自旋	相对丰度（莫耳分率）	相对丰度（莫耳分率）
符号	激发能量			半衰期^{[n 1]}	衰变方式^[1]^{[n 2]}	衰变产物^{[n 3]}	原子核自旋	相对丰度（莫耳分率）	相对丰度（莫耳分率）
¹⁹¹At	85	106		1.7(+11−5) ms			(1/2+)
^191mAt				2.1(+4−3) ms			(7/2−)
¹⁹³At	85	108	192.99984(6)	28(+5−4) ms	α	¹⁸⁹Bi	(1/2+)
^193m1At	50 keV			21(5) ms			(7/2−)
^193m2At	39 keV			27(+4−5) ms			(13/2+)
¹⁹⁴At	85	109	193.99873(20)	~40 ms	α	¹⁹⁰Bi	3+#
¹⁹⁴At	85	109	193.99873(20)	~40 ms	β⁺ （不常见）	¹⁹⁴Po	3+#
^194mAt	480(190) keV			~250 ms	α	¹⁹⁰Bi	10−#
^194mAt	480(190) keV			~250 ms	IT （不常见）	¹⁹⁴At	10−#
¹⁹⁵At	85	110	194.996268(10)	328(20) ms	α (75%)	¹⁹¹Bi	(1/2+)
¹⁹⁵At	85	110	194.996268(10)	328(20) ms	β⁺ (25%)	¹⁹⁵Po	(1/2+)
^195mAt	34(7) keV			147(5) ms			9/2−#
¹⁹⁶At	85	111	195.99579(6)	253(9) ms	α (96%)	¹⁹²Bi	3+#
¹⁹⁶At	85	111	195.99579(6)	253(9) ms	β⁺ (4.0%)	¹⁹⁶Po	3+#
^196m1At	−30(80) keV			20# ms			10−#
^196m2At	157.9(1) keV			11 µs			5+#
¹⁹⁷At	85	112	196.99319(5)	0.390(16) s	α (96%)	¹⁹³Bi	(9/2−)
¹⁹⁷At	85	112	196.99319(5)	0.390(16) s	β⁺ (4.0%)	¹⁹⁷Po	(9/2−)
^197mAt	52(10) keV			2.0(2) s			(1/2+)
¹⁹⁸At	85	113	197.99284(5)	4.2(3) s	α (94%)	¹⁹⁴Bi	(3+)
¹⁹⁸At	85	113	197.99284(5)	4.2(3) s	β⁺ (6%)	¹⁹⁸Po	(3+)
^198mAt	330(90)# keV			1.0(2) s			(10−)
¹⁹⁹At	85	114	198.99053(5)	6.92(13) s	α (89%)	¹⁹⁵Bi	(9/2−)
¹⁹⁹At	85	114	198.99053(5)	6.92(13) s	β⁺ (11%)	¹⁹⁹Po	(9/2−)
²⁰⁰At	85	115	199.990351(26)	43.2(9) s	α (57%)	¹⁹⁶Bi	(3+)
²⁰⁰At	85	115	199.990351(26)	43.2(9) s	β⁺ (43%)	²⁰⁰Po	(3+)
^200m1At	112.7(30) keV			47(1) s	α (43%)	¹⁹⁶Bi	(7+)
					IT	²⁰⁰At
					β⁺	²⁰⁰Po
^200m2At	344(3) keV			3.5(2) s			(10−)
²⁰¹At	85	116	200.988417(9)	85(3) s	α (71%)	¹⁹⁷Bi	(9/2−)
²⁰¹At	85	116	200.988417(9)	85(3) s	β⁺ (29%)	²⁰¹Po	(9/2−)
²⁰²At	85	117	201.98863(3)	184(1) s	β⁺ (88%)	²⁰²Po	(2,3)+
²⁰²At	85	117	201.98863(3)	184(1) s	α (12%)	¹⁹⁸Bi	(2,3)+
^202m1At	190(40) keV			182(2) s			(7+)
^202m2At	580(40) keV			460(50) ms			(10−)
²⁰³At	85	118	202.986942(13)	7.37(13) min	β⁺ (69%)	²⁰³Po	9/2−
²⁰³At	85	118	202.986942(13)	7.37(13) min	α (31%)	¹⁹⁹Bi	9/2−
²⁰⁴At	85	119	203.987251(26)	9.2(2) min	β⁺ (96%)	²⁰⁴Po	7+
²⁰⁴At	85	119	203.987251(26)	9.2(2) min	α (3.8%)	²⁰⁰Bi	7+
^204mAt	587.30(20) keV			108(10) ms	IT	²⁰⁴At	(10−)
²⁰⁵At	85	120	204.986074(16)	26.2(5) min	β⁺ (90%)	²⁰⁵Po	9/2−
²⁰⁵At	85	120	204.986074(16)	26.2(5) min	α (10%)	²⁰¹Bi	9/2−
^205mAt	2339.65(23) keV			7.76(14) µs			29/2+
²⁰⁶At	85	121	205.986667(22)	30.6(13) min	β⁺ (99.11%)	²⁰⁶Po	(5)+
²⁰⁶At	85	121	205.986667(22)	30.6(13) min	α (0.9%)	²⁰²Bi	(5)+
^206mAt	807(3) keV			410(80) ns			(10)−
²⁰⁷At	85	122	206.985784(23)	1.80(4) h	β⁺ (91%)	²⁰⁷Po	9/2−
²⁰⁷At	85	122	206.985784(23)	1.80(4) h	α (8.6%)	²⁰³Bi	9/2−
²⁰⁸At	85	123	207.986590(28)	1.63(3) h	β⁺ (99.5%)	²⁰⁸Po	6+
²⁰⁸At	85	123	207.986590(28)	1.63(3) h	α (0.55%)	²⁰⁴Bi	6+
²⁰⁹At	85	124	208.986173(8)	5.41(5) h	β⁺ (96%)	²⁰⁹Po	9/2−
²⁰⁹At	85	124	208.986173(8)	5.41(5) h	α (4.0%)	²⁰⁵Bi	9/2−
²¹⁰At	85	125	209.987148(8)	8.1(4) h	β⁺ (99.8%)	²¹⁰Po	(5)+
²¹⁰At	85	125	209.987148(8)	8.1(4) h	α (0.18%)	²⁰⁶Bi	(5)+
^210m1At	2549.6(2) keV			482(6) µs			(15)−
^210m2At	4027.7(2) keV			5.66(7) µs			(19)+
²¹¹At	85	126	210.9874963(30)	7.214(7) h	ε (58.2%)	²¹¹Po	9/2−
²¹¹At	85	126	210.9874963(30)	7.214(7) h	α (42%)	²⁰⁷Bi	9/2−
²¹²At	85	127	211.990745(8)	0.314(2) s	α (99.95%)	²⁰⁸Bi	(1−)
					β⁺ (0.05%)	²¹²Po
					β⁻ (2×10⁻⁶%)	²¹²Rn
^212m1At	223(7) keV			0.119(3) s	α (99%)	²⁰⁸Bi	(9−)
^212m1At	223(7) keV			0.119(3) s	IT (1%)	²¹²At	(9−)
^212m2At	4771.6(11) keV			152(5) µs			(25−)
²¹³At	85	128	212.992937(5)	125(6) ns	α	²⁰⁹Bi	9/2−
²¹⁴At	85	129	213.996372(5)	558(10) ns	α	²¹⁰Bi	1−
^214m1At	59(9) keV			265(30) ns
^214m2At	231(6) keV			760(15) ns			9−
²¹⁵At	85	130	214.998653(7)	0.10(2) ms	α	²¹¹Bi	9/2−	Trace^{[n 4]}
²¹⁶At	85	131	216.002423(4)	0.30(3) ms	α (99.99%)	²¹²Bi	1−
					β⁻ (.006%)	²¹⁶Rn
					ε (3×10⁻⁷%)	²¹⁶Po
^216mAt	413(5) keV			100# µs			(9−)
²¹⁷At	85	132	217.004719(5)	32.3(4) ms	α (99.98%)	²¹³Bi	9/2−
²¹⁷At	85	132	217.004719(5)	32.3(4) ms	β⁻ (.012%)	²¹⁷Rn	9/2−
²¹⁸At	85	133	218.008694(12)	1.5(3) s	α (99.9%)	²¹⁴Bi	1−#	Trace^{[n 5]}
²¹⁸At	85	133	218.008694(12)	1.5(3) s	β⁻ (0.10%)	²¹⁸Rn	1−#	Trace^{[n 5]}
²¹⁹At	85	134	219.011162(4)	56(3) s	α (97%)	²¹⁵Bi	5/2−#	Trace^{[n 4]}
²¹⁹At	85	134	219.011162(4)	56(3) s	β⁻ (3.0%)	²¹⁹Rn	5/2−#	Trace^{[n 4]}
²²⁰At	85	135	220.01541(6)	3.71(4) min	β⁻ (92%)	²²⁰Rn	3(−#)
²²⁰At	85	135	220.01541(6)	3.71(4) min	α (8.0%)	²¹⁶Bi	3(−#)
²²¹At	85	136	221.01805(21)#	2.3(2) min	β⁻	²²¹Rn	3/2−#
²²²At	85	137	222.02233(32)#	54(10) s	β⁻	²²²Rn
²²³At	85	138	223.02519(43)#	50(7) s			3/2−#

备注：画上#号的数据代表没有经过实验的证明，只是理论推测而已，而用括号括起来的代表数据不确定性。

←	同位素列表	→
钋的同位素	砹的同位素	氡的同位素

注释

↑ Bold for isotopes with half-lives longer than the age of the universe (nearly stable)
↑ Abbreviations:
ε: Electron capture
IT: Isomeric transition
↑ Bold for stable isotopes
↑ ^4.0 ^4.1 Intermediate decay product of ²³⁵U
↑ Intermediate decay product of ²³⁸U

参考文献

↑ Universal Nuclide Chart. nucleonica. [2015-10-16].

Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report) . Pure Appl. Chem. Vol. 75, No. 6, pp. 683–800, (2003) and Atomic Weights Revised (2005) .
Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
- Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties , Nuc. Phys. A 729, pp. 3–128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 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.

[1] Bold for isotopes with half-lives longer than the age of the universe (nearly stable)

[3] Abbreviations:
ε: Electron capture
IT: Isomeric transition

[4] Bold for stable isotopes

[as-5] 4.0 ^4.1 Intermediate decay product of ²³⁵U

[6] Intermediate decay product of ²³⁸U

[2] Universal Nuclide Chart. nucleonica. [2015-10-16].

[n 1]

[1]

[n 2]

[n 3]

[n 4]

[n 5]