| ||||||||||||||||||||||||||||
Standard atomic weight Ar°(Pr) | ||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Naturally occurring praseodymium (59Pr) is composed of one stable isotope, 141Pr. Thirty-eight radioisotopes have been characterized with the most stable being 143Pr, with a half-life of 13.57 days and 142Pr, with a half-life of 19.12 hours. All of the remaining radioactive isotopes have half-lives that are less than 5.985 hours and the majority of these have half-lives that are less than 33 seconds. This element also has 15 meta states with the most stable being 138mPr (t1/2 2.12 hours), 142mPr (t1/2 14.6 minutes) and 134mPr (t1/2 11 minutes).
The isotopes of praseodymium range in atomic weight from 120.955 u (121Pr) to 158.955 u (159Pr). The primary decay mode before the stable isotope, 141Pr, is electron capture and the mode after is beta decay. The primary decay products before 141Pr are element 58 ( cerium) isotopes and the primary products after are element 60 ( neodymium) isotopes.
Nuclide [n 1] |
Z | N |
Isotopic mass (
Da) [n 2] [n 3] |
Half-life [n 4] |
Decay mode [n 5] |
Daughter isotope [n 6] [n 7] |
Spin and parity [n 8] [n 4] |
Isotopic abundance | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Excitation energy [n 4] | |||||||||||||||||||
121Pr | 59 | 62 | 120.95536(75)# | 600(300) ms | p | 120Ce | (3/2−) | ||||||||||||
β+ (rare) | 121Ce | ||||||||||||||||||
β+, p (rare) | 120La | ||||||||||||||||||
122Pr | 59 | 63 | 121.95181(54)# | 500# ms | β+ | 122Ce | |||||||||||||
123Pr | 59 | 64 | 122.94596(64)# | 800# ms | β+ | 123Ce | 3/2+# | ||||||||||||
124Pr | 59 | 65 | 123.94296(64)# | 1.2(2) s | β+ | 124Ce | |||||||||||||
β+, p (rare) | 123La | ||||||||||||||||||
125Pr | 59 | 66 | 124.93783(43)# | 3.3(7) s | β+ | 125Ce | 3/2+# | ||||||||||||
β+, p (rare) | 124La | ||||||||||||||||||
126Pr | 59 | 67 | 125.93531(21)# | 3.12(18) s | β+ | 126Ce | (4, 5, 6) | ||||||||||||
β+, p (rare) | 125La | ||||||||||||||||||
127Pr | 59 | 68 | 126.93083(21)# | 4.2(3) s | β+ | 127Ce | 3/2+# | ||||||||||||
127mPr | 600(200)# keV | 50# ms | 11/2− | ||||||||||||||||
128Pr | 59 | 69 | 127.92879(3) | 2.84(9) s | β+ | 128Ce | (3+) | ||||||||||||
β+, p (rare) | 127La | ||||||||||||||||||
129Pr | 59 | 70 | 128.92510(3) | 32(3) s | β+ | 129Ce | (11/2−) | ||||||||||||
129mPr | 382.7(5) keV | 1# ms | β+ | 129Ce | (11/2−) | ||||||||||||||
130Pr | 59 | 71 | 129.92359(7) | 40.0(4) s | β+ | 130Ce | (6, 7)(+#) | ||||||||||||
130mPr | 100(100)# keV | 10# s | 2+# | ||||||||||||||||
131Pr | 59 | 72 | 130.92026(6) | 1.50(3) min | β+ | 131Ce | (3/2+) | ||||||||||||
131mPr | 152.4(2) keV | 5.7(2) s | IT (96.4%) | 131Pr | (11/2−) | ||||||||||||||
β+ (3.59%) | 131Ce | ||||||||||||||||||
132Pr | 59 | 73 | 131.91926(6) | 1.49(11) min | β+ | 132Ce | (2+) | ||||||||||||
132mPr | 0(100)# keV | 20# s | β+ | 132Ce | (5+) | ||||||||||||||
133Pr | 59 | 74 | 132.916331(13) | 6.5(3) min | β+ | 133Ce | (3/2+) | ||||||||||||
133mPr | 192.05(14) keV | 1.1(2) μs | (11/2−) | ||||||||||||||||
134Pr | 59 | 75 | 133.91571(4) | 17(2) min | β+ | 134Ce | (5−) | ||||||||||||
134mPr | 0(100)# keV | ~11 min | β+ | 134Ce | 2− | ||||||||||||||
135Pr | 59 | 76 | 134.913112(13) | 24(2) min | β+ | 135Ce | 3/2(+) | ||||||||||||
135mPr | 358.06(6) keV | 105(10) μs | (11/2−) | ||||||||||||||||
136Pr | 59 | 77 | 135.912692(13) | 13.1(1) min | β+ | 136Ce | 2+ | ||||||||||||
137Pr | 59 | 78 | 136.910705(13) | 1.28(3) h | β+ | 137Ce | 5/2+ | ||||||||||||
137mPr | 561.22(23) keV | 2.66(7) μs | 11/2− | ||||||||||||||||
138Pr | 59 | 79 | 137.910755(15) | 1.45(5) min | β+ | 138Ce | 1+ | ||||||||||||
138mPr | 348(23) keV | 2.12(4) h | β+ | 138Ce | 7− | ||||||||||||||
139Pr | 59 | 80 | 138.908938(8) | 4.41(4) h | β+ | 139Ce | 5/2+ | ||||||||||||
140Pr | 59 | 81 | 139.909076(7) | 3.39(1) min | EC (51.3(22)%) | 140Ce | 1+ | ||||||||||||
β+ (48.7(22)%) | |||||||||||||||||||
140m1Pr | 127.5(3) keV | 0.35(2) μs | 5+ | ||||||||||||||||
140m2Pr | 763.3(7) keV | 3.05(20) μs | (8)− | ||||||||||||||||
141Pr [n 9] | 59 | 82 | 140.9076528(26) | Stable | 5/2+ | 1.0000 | |||||||||||||
142Pr | 59 | 83 | 141.9100448(26) | 19.12(4) h | β− (99.98%) | 142Nd | 2− | ||||||||||||
EC (.0164%) | 142Ce | ||||||||||||||||||
142mPr | 3.694(3) keV | 14.6(5) min | IT | 142Pr | 5− | ||||||||||||||
143Pr [n 9] | 59 | 84 | 142.9108169(28) | 13.57(2) d | β− | 143Nd | 7/2+ | ||||||||||||
144Pr | 59 | 85 | 143.913305(4) | 17.28(5) min | β− | 144Nd | 0− | ||||||||||||
144mPr | 59.03(3) keV | 7.2(3) min | IT (99.93%) | 144Pr | 3− | ||||||||||||||
β− (.07%) | 144Nd | ||||||||||||||||||
145Pr | 59 | 86 | 144.914512(8) | 5.984(10) h | β− | 145Nd | 7/2+ | ||||||||||||
146Pr | 59 | 87 | 145.91764(7) | 24.15(18) min | β− | 146Nd | (2)− | ||||||||||||
147Pr | 59 | 88 | 146.918996(25) | 13.4(4) min | β− | 147Nd | (3/2+) | ||||||||||||
148Pr | 59 | 89 | 147.922135(28) | 2.29(2) min | β− | 148Nd | 1− | ||||||||||||
148mPr | 50(30)# keV | 2.01(7) min | β− | 148Nd | (4) | ||||||||||||||
149Pr | 59 | 90 | 148.92372(9) | 2.26(7) min | β− | 149Nd | (5/2+) | ||||||||||||
150Pr | 59 | 91 | 149.926673(28) | 6.19(16) s | β− | 150Nd | (1)− | ||||||||||||
151Pr | 59 | 92 | 150.928319(25) | 18.90(7) s | β− | 151Nd | (3/2)(−#) | ||||||||||||
152Pr | 59 | 93 | 151.93150(13) | 3.63(12) s | β− | 152Nd | 4+ | ||||||||||||
153Pr | 59 | 94 | 152.93384(11) | 4.28(11) s | β− | 153Nd | 5/2−# | ||||||||||||
154Pr | 59 | 95 | 153.93752(16) | 2.3(1) s | β− | 154Nd | (3+, 2+) | ||||||||||||
155Pr | 59 | 96 | 154.94012(32)# | 1# s [>300 ns] | β− | 155Nd | 5/2−# | ||||||||||||
156Pr | 59 | 97 | 155.94427(43)# | 500# ms [>300 ns] | β− | 156Nd | |||||||||||||
157Pr | 59 | 98 | 156.94743(43)# | 300# ms | β− | 157Nd | 5/2−# | ||||||||||||
158Pr | 59 | 99 | 157.95198(64)# | 200# ms | β− | 158Nd | |||||||||||||
159Pr | 59 | 100 | 158.95550(75)# | 100# ms | β− | 159Nd | 5/2−# | ||||||||||||
This table header & footer: |
EC: | Electron capture |
IT: |
Isomeric transition
|
p: | Proton emission |
| ||||||||||||||||||||||||||||
Standard atomic weight Ar°(Pr) | ||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Naturally occurring praseodymium (59Pr) is composed of one stable isotope, 141Pr. Thirty-eight radioisotopes have been characterized with the most stable being 143Pr, with a half-life of 13.57 days and 142Pr, with a half-life of 19.12 hours. All of the remaining radioactive isotopes have half-lives that are less than 5.985 hours and the majority of these have half-lives that are less than 33 seconds. This element also has 15 meta states with the most stable being 138mPr (t1/2 2.12 hours), 142mPr (t1/2 14.6 minutes) and 134mPr (t1/2 11 minutes).
The isotopes of praseodymium range in atomic weight from 120.955 u (121Pr) to 158.955 u (159Pr). The primary decay mode before the stable isotope, 141Pr, is electron capture and the mode after is beta decay. The primary decay products before 141Pr are element 58 ( cerium) isotopes and the primary products after are element 60 ( neodymium) isotopes.
Nuclide [n 1] |
Z | N |
Isotopic mass (
Da) [n 2] [n 3] |
Half-life [n 4] |
Decay mode [n 5] |
Daughter isotope [n 6] [n 7] |
Spin and parity [n 8] [n 4] |
Isotopic abundance | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Excitation energy [n 4] | |||||||||||||||||||
121Pr | 59 | 62 | 120.95536(75)# | 600(300) ms | p | 120Ce | (3/2−) | ||||||||||||
β+ (rare) | 121Ce | ||||||||||||||||||
β+, p (rare) | 120La | ||||||||||||||||||
122Pr | 59 | 63 | 121.95181(54)# | 500# ms | β+ | 122Ce | |||||||||||||
123Pr | 59 | 64 | 122.94596(64)# | 800# ms | β+ | 123Ce | 3/2+# | ||||||||||||
124Pr | 59 | 65 | 123.94296(64)# | 1.2(2) s | β+ | 124Ce | |||||||||||||
β+, p (rare) | 123La | ||||||||||||||||||
125Pr | 59 | 66 | 124.93783(43)# | 3.3(7) s | β+ | 125Ce | 3/2+# | ||||||||||||
β+, p (rare) | 124La | ||||||||||||||||||
126Pr | 59 | 67 | 125.93531(21)# | 3.12(18) s | β+ | 126Ce | (4, 5, 6) | ||||||||||||
β+, p (rare) | 125La | ||||||||||||||||||
127Pr | 59 | 68 | 126.93083(21)# | 4.2(3) s | β+ | 127Ce | 3/2+# | ||||||||||||
127mPr | 600(200)# keV | 50# ms | 11/2− | ||||||||||||||||
128Pr | 59 | 69 | 127.92879(3) | 2.84(9) s | β+ | 128Ce | (3+) | ||||||||||||
β+, p (rare) | 127La | ||||||||||||||||||
129Pr | 59 | 70 | 128.92510(3) | 32(3) s | β+ | 129Ce | (11/2−) | ||||||||||||
129mPr | 382.7(5) keV | 1# ms | β+ | 129Ce | (11/2−) | ||||||||||||||
130Pr | 59 | 71 | 129.92359(7) | 40.0(4) s | β+ | 130Ce | (6, 7)(+#) | ||||||||||||
130mPr | 100(100)# keV | 10# s | 2+# | ||||||||||||||||
131Pr | 59 | 72 | 130.92026(6) | 1.50(3) min | β+ | 131Ce | (3/2+) | ||||||||||||
131mPr | 152.4(2) keV | 5.7(2) s | IT (96.4%) | 131Pr | (11/2−) | ||||||||||||||
β+ (3.59%) | 131Ce | ||||||||||||||||||
132Pr | 59 | 73 | 131.91926(6) | 1.49(11) min | β+ | 132Ce | (2+) | ||||||||||||
132mPr | 0(100)# keV | 20# s | β+ | 132Ce | (5+) | ||||||||||||||
133Pr | 59 | 74 | 132.916331(13) | 6.5(3) min | β+ | 133Ce | (3/2+) | ||||||||||||
133mPr | 192.05(14) keV | 1.1(2) μs | (11/2−) | ||||||||||||||||
134Pr | 59 | 75 | 133.91571(4) | 17(2) min | β+ | 134Ce | (5−) | ||||||||||||
134mPr | 0(100)# keV | ~11 min | β+ | 134Ce | 2− | ||||||||||||||
135Pr | 59 | 76 | 134.913112(13) | 24(2) min | β+ | 135Ce | 3/2(+) | ||||||||||||
135mPr | 358.06(6) keV | 105(10) μs | (11/2−) | ||||||||||||||||
136Pr | 59 | 77 | 135.912692(13) | 13.1(1) min | β+ | 136Ce | 2+ | ||||||||||||
137Pr | 59 | 78 | 136.910705(13) | 1.28(3) h | β+ | 137Ce | 5/2+ | ||||||||||||
137mPr | 561.22(23) keV | 2.66(7) μs | 11/2− | ||||||||||||||||
138Pr | 59 | 79 | 137.910755(15) | 1.45(5) min | β+ | 138Ce | 1+ | ||||||||||||
138mPr | 348(23) keV | 2.12(4) h | β+ | 138Ce | 7− | ||||||||||||||
139Pr | 59 | 80 | 138.908938(8) | 4.41(4) h | β+ | 139Ce | 5/2+ | ||||||||||||
140Pr | 59 | 81 | 139.909076(7) | 3.39(1) min | EC (51.3(22)%) | 140Ce | 1+ | ||||||||||||
β+ (48.7(22)%) | |||||||||||||||||||
140m1Pr | 127.5(3) keV | 0.35(2) μs | 5+ | ||||||||||||||||
140m2Pr | 763.3(7) keV | 3.05(20) μs | (8)− | ||||||||||||||||
141Pr [n 9] | 59 | 82 | 140.9076528(26) | Stable | 5/2+ | 1.0000 | |||||||||||||
142Pr | 59 | 83 | 141.9100448(26) | 19.12(4) h | β− (99.98%) | 142Nd | 2− | ||||||||||||
EC (.0164%) | 142Ce | ||||||||||||||||||
142mPr | 3.694(3) keV | 14.6(5) min | IT | 142Pr | 5− | ||||||||||||||
143Pr [n 9] | 59 | 84 | 142.9108169(28) | 13.57(2) d | β− | 143Nd | 7/2+ | ||||||||||||
144Pr | 59 | 85 | 143.913305(4) | 17.28(5) min | β− | 144Nd | 0− | ||||||||||||
144mPr | 59.03(3) keV | 7.2(3) min | IT (99.93%) | 144Pr | 3− | ||||||||||||||
β− (.07%) | 144Nd | ||||||||||||||||||
145Pr | 59 | 86 | 144.914512(8) | 5.984(10) h | β− | 145Nd | 7/2+ | ||||||||||||
146Pr | 59 | 87 | 145.91764(7) | 24.15(18) min | β− | 146Nd | (2)− | ||||||||||||
147Pr | 59 | 88 | 146.918996(25) | 13.4(4) min | β− | 147Nd | (3/2+) | ||||||||||||
148Pr | 59 | 89 | 147.922135(28) | 2.29(2) min | β− | 148Nd | 1− | ||||||||||||
148mPr | 50(30)# keV | 2.01(7) min | β− | 148Nd | (4) | ||||||||||||||
149Pr | 59 | 90 | 148.92372(9) | 2.26(7) min | β− | 149Nd | (5/2+) | ||||||||||||
150Pr | 59 | 91 | 149.926673(28) | 6.19(16) s | β− | 150Nd | (1)− | ||||||||||||
151Pr | 59 | 92 | 150.928319(25) | 18.90(7) s | β− | 151Nd | (3/2)(−#) | ||||||||||||
152Pr | 59 | 93 | 151.93150(13) | 3.63(12) s | β− | 152Nd | 4+ | ||||||||||||
153Pr | 59 | 94 | 152.93384(11) | 4.28(11) s | β− | 153Nd | 5/2−# | ||||||||||||
154Pr | 59 | 95 | 153.93752(16) | 2.3(1) s | β− | 154Nd | (3+, 2+) | ||||||||||||
155Pr | 59 | 96 | 154.94012(32)# | 1# s [>300 ns] | β− | 155Nd | 5/2−# | ||||||||||||
156Pr | 59 | 97 | 155.94427(43)# | 500# ms [>300 ns] | β− | 156Nd | |||||||||||||
157Pr | 59 | 98 | 156.94743(43)# | 300# ms | β− | 157Nd | 5/2−# | ||||||||||||
158Pr | 59 | 99 | 157.95198(64)# | 200# ms | β− | 158Nd | |||||||||||||
159Pr | 59 | 100 | 158.95550(75)# | 100# ms | β− | 159Nd | 5/2−# | ||||||||||||
This table header & footer: |
EC: | Electron capture |
IT: |
Isomeric transition
|
p: | Proton emission |