Although

phosphorus Phosphorus is a chemical element with the symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Ear ...

(₁₅P) has 23

isotope Isotopes are two or more types of atoms that have the same atomic number (number of protons in their nuclei) and position in the periodic table (and hence belong to the same chemical element), and that differ in nucleon numbers (mass numbers) ...

s from ²⁵P to ⁴⁷P, only ³¹P is stable; as such, phosphorus is considered a monoisotopic element. The longest-lived radioactive isotopes are ³³P with a half-life of 25.34 days and ³²P with a half-life of 14.268 days. All others have half-lives of under 2.5 minutes, most under a second. The least stable is ²⁵P with a half-life shorter than 30 nanoseconds.

List of isotopes

, - , rowspan=3, ²⁴P?The existence of this isotope has not been experimentally confirmed; given data is inferred or estimated from periodic trends. , rowspan=3 style="text-align:right" , 15 , rowspan=3 style="text-align:right" , 9 , rowspan=3, 24.03652(54)# , rowspan=3, , p? , ²³Si , rowspan=3, 1+# , rowspan=3, , rowspan=3, , - , β⁺? , ²⁴Si , - , β⁺, p? , ²³Al , - , ²⁵P? , style="text-align:right" , 15 , style="text-align:right" , 10 , 25.02119(43)# , <30 ns , p? , ²⁴Si , (1/2+)# , , , - , rowspan=2, ²⁶PHas 1 halo proton , rowspan=2 style="text-align:right" , 15 , rowspan=2 style="text-align:right" , 11 , rowspan=2, 26.01178(21)# , rowspan=2, 43.7(6) ms , β⁺ (63.2%) , ²⁶Si , rowspan=2, (3+) , rowspan=2, , rowspan=2, , - , β⁺, p (36.8%) , ²⁵Al , - , style="text-indent:1em", ^26mP , colspan=3 style="text-indent:2em", 164.4(1) keV , 120(9) ns , IT , ²⁶P , , , , - , rowspan=2, ²⁷P , rowspan=2 style="text-align:right" , 15 , rowspan=2 style="text-align:right" , 12 , rowspan=2, 26.999224(28) , rowspan=2, 260(80) ms , β⁺ (99.93%) , ²⁷Si , rowspan=2, 1/2+ , rowspan=2, , rowspan=2, , - , β⁺, p (.07%) , ²⁶Al , - , rowspan=3, ²⁸P , rowspan=3 style="text-align:right" , 15 , rowspan=3 style="text-align:right" , 13 , rowspan=3, 27.9923266(12) , rowspan=3, 270.3(5) ms , β⁺ (99.99%) , ²⁸Si , rowspan=3, 3+ , rowspan=3, , rowspan=3, , - , β⁺, p (.0013%) , ²⁷Al , - , β⁺, α (8.6×10⁻⁴%) , ²⁴Mg , - , ²⁹P , style="text-align:right" , 15 , style="text-align:right" , 14 , 28.9818004(4) , 4.142(15) s , β⁺ , ²⁹Si , 1/2+ , , , - , ³⁰P , style="text-align:right" , 15 , style="text-align:right" , 15 , 29.97831349(7) , 2.498(4) min , β⁺ , ³⁰Si , 1+ , , , - , ³¹P , style="text-align:right" , 15 , style="text-align:right" , 16 , 30.9737619986(7) , colspan=3 align=center, Stable , 1/2+ , 1.0000 , , - , ³²P , style="text-align:right" , 15 , style="text-align:right" , 17 , 31.97390764(4) , 14.268(5) d , β⁻ , ³²S , 1+ ,

Trace Trace may refer to: Arts and entertainment Music * Trace (Son Volt album), ''Trace'' (Son Volt album), 1995 * Trace (Died Pretty album), ''Trace'' (Died Pretty album), 1993 * Trace (band), a Dutch progressive rock band * The Trace (album), ''The ...

, , - , ³³P , style="text-align:right" , 15 , style="text-align:right" , 18 , 32.9717257(12) , 25.35(11) d , β⁻ , ³³S , 1/2+ , , , - , ³⁴P , style="text-align:right" , 15 , style="text-align:right" , 19 , 33.9736459(9) , 12.43(10) s , β⁻ , ³⁴S , 1+ , , , - , ³⁵P , style="text-align:right" , 15 , style="text-align:right" , 20 , 34.9733141(20) , 47.3(8) s , β⁻ , ³⁵S , 1/2+ , , , - , ³⁶P , style="text-align:right" , 15 , style="text-align:right" , 21 , 35.978260(14) , 5.6(3) s , β⁻ , ³⁶S , 4− , , , - , ³⁷P , style="text-align:right" , 15 , style="text-align:right" , 22 , 36.97961(4) , 2.31(13) s , β⁻ , ³⁷S , (1/2+) , , , - , rowspan=2, ³⁸P , rowspan=2 style="text-align:right" , 15 , rowspan=2 style="text-align:right" , 23 , rowspan=2, 37.98430(8) , rowspan=2, 0.64(14) s , β⁻ (87.5%) , ³⁸S , rowspan=2, , rowspan=2, , rowspan=2, , - , β⁻, n (12.5%) , ³⁷S , - , rowspan=2, ³⁹P , rowspan=2 style="text-align:right" , 15 , rowspan=2 style="text-align:right" , 24 , rowspan=2, 38.98629(12) , rowspan=2, 282(24) ms , β⁻ (73.2%) , ³⁹S , rowspan=2, 1/2+# , rowspan=2, , rowspan=2, , - , β⁻, n (26.8%) , ³⁸S , - , rowspan=2, ⁴⁰P , rowspan=2 style="text-align:right" , 15 , rowspan=2 style="text-align:right" , 25 , rowspan=2, 39.99129(16) , rowspan=2, 150(8) ms , β⁻ (84.2%) , ⁴⁰S , rowspan=2, (2−,3−) , rowspan=2, , rowspan=2, , - , β⁻, n (15.8%) , ³⁹S , - , rowspan=2, ⁴¹P , rowspan=2 style="text-align:right" , 15 , rowspan=2 style="text-align:right" , 26 , rowspan=2, 40.99465(13) , rowspan=2, 101(5) ms , β⁻ (70%) , ⁴¹S , rowspan=2, 1/2+# , rowspan=2, , rowspan=2, , - , β⁻, n (30%) , ⁴⁰S , - , rowspan=2, ⁴²P , rowspan=2 style="text-align:right" , 15 , rowspan=2 style="text-align:right" , 27 , rowspan=2, 42.00108(34) , rowspan=2, 48.5(15) ms , β⁻ (50%) , ⁴²S , rowspan=2, , rowspan=2, , rowspan=2, , - , β⁻, n (50%) , ⁴¹S , - , rowspan=2, ⁴³P , rowspan=2 style="text-align:right" , 15 , rowspan=2 style="text-align:right" , 28 , rowspan=2, 43.00502(60) , rowspan=2, 35.8(13) ms , β⁻, n , ⁴²S , rowspan=2, 1/2+# , rowspan=2, , rowspan=2, , - , β⁻ , ⁴³S , - , ⁴⁴P , style="text-align:right" , 15 , style="text-align:right" , 29 , 44.01122(54)# , 18.5(25) ms , β⁻ , ⁴⁴S , , , , - , ⁴⁵P , style="text-align:right" , 15 , style="text-align:right" , 30 , 45.01675(54)# , 8# ms 200 ns, β⁻ , ⁴⁵S , 1/2+# , , , - , ⁴⁶P , style="text-align:right" , 15 , style="text-align:right" , 31 , 46.02466(75)# , 4# ms 200 ns, β⁻ , ⁴⁶S , , , , - , ⁴⁷P , style="text-align:right" , 15 , style="text-align:right" , 32 , 47.03190(86)# , 2# ms , β⁻ , ⁴⁷S , , ,

Radioactive isotopes

Phosphorus-32

³²P, a

beta Beta (, ; uppercase , lowercase , or cursive ; grc, βῆτα, bē̂ta or ell, βήτα, víta) is the second letter of the Greek alphabet. In the system of Greek numerals, it has a value of 2. In Modern Greek, it represents the voiced labiod ...

-emitter (1.71 MeV) with a

half-life Half-life (symbol ) is the time required for a quantity (of substance) to reduce to half of its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable ato ...

of 14.3 days, is used routinely in life-science laboratories, primarily to produce radiolabeled DNA and

RNA Ribonucleic acid (RNA) is a polymeric molecule essential in various biological roles in coding, decoding, regulation and expression of genes. RNA and deoxyribonucleic acid ( DNA) are nucleic acids. Along with lipids, proteins, and carbohydra ...

probes, ''e.g.'' for use in

Northern blot The northern blot, or RNA blot,Gilbert, S. F. (2000) Developmental Biology, 6th Ed. Sunderland MA, Sinauer Associates. is a technique used in molecular biology research to study gene expression by detection of RNA (or isolated mRNA) in a sample.K ...

s or

Southern blot A Southern blot is a method used in molecular biology for detection of a specific DNA sequence in DNA samples. Southern blotting combines transfer of electrophoresis-separated DNA fragments to a filter membrane and subsequent fragment detecti ...

s. Because the high-energy beta particles produced penetrate

skin Skin is the layer of usually soft, flexible outer tissue covering the body of a vertebrate animal, with three main functions: protection, regulation, and sensation. Other cuticle, animal coverings, such as the arthropod exoskeleton, have diffe ...

and

cornea The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. Along with the anterior chamber and lens, the cornea refracts light, accounting for approximately two-thirds of the eye's total optical power ...

s, and because any ³²P ingested, inhaled, or absorbed is readily incorporated into

bone A bone is a Stiffness, rigid Organ (biology), organ that constitutes part of the skeleton in most vertebrate animals. Bones protect the various other organs of the body, produce red blood cell, red and white blood cells, store minerals, provid ...

and

nucleic acid Nucleic acids are biopolymers, macromolecules, essential to all known forms of life. They are composed of nucleotides, which are the monomers made of three components: a 5-carbon sugar, a phosphate group and a nitrogenous base. The two main cl ...

OSHA OSHA or Osha may refer to: Work * Occupational Safety and Health Administration, a federal agency of the United States that regulates workplace safety and health * Occupational Safety and Health Act (United States) of 1970, a federal law in the Un ...

requires that a lab coat, disposable gloves, and safety glasses or goggles be worn when working with ³²P, and that working directly over an open container be avoided in order to protect the eyes.

Monitor Monitor or monitor may refer to: Places * Monitor, Alberta * Monitor, Indiana, town in the United States * Monitor, Kentucky * Monitor, Oregon, unincorporated community in the United States * Monitor, Washington * Monitor, Logan County, West Vir ...

ing personal, clothing, and surface contamination is also required. In addition, due to the high energy of the beta particles, shielding this radiation with the normally used dense materials (''e.g.''

lead Lead is a chemical element with the symbol Pb (from the Latin ) and atomic number 82. It is a heavy metal that is denser than most common materials. Lead is soft and malleable, and also has a relatively low melting point. When freshly cu ...

), gives rise to secondary emission of

X-ray An X-ray, or, much less commonly, X-radiation, is a penetrating form of high-energy electromagnetic radiation. Most X-rays have a wavelength ranging from 10 picometers to 10 nanometers, corresponding to frequencies in the range 30&nb ...

s via a process known as

bremsstrahlung ''Bremsstrahlung'' (), from "to brake" and "radiation"; i.e., "braking radiation" or "deceleration radiation", is electromagnetic radiation produced by the deceleration of a charged particle when deflected by another charged particle, typicall ...

, meaning braking radiation. Therefore, shielding must be accomplished with low-density materials, ''e.g.'' Plexiglas, Lucite,

plastic Plastics are a wide range of synthetic or semi-synthetic materials that use polymers as a main ingredient. Their plasticity makes it possible for plastics to be moulded, extruded or pressed into solid objects of various shapes. This adaptab ...

wood Wood is a porous and fibrous structural tissue found in the stems and roots of trees and other woody plants. It is an organic materiala natural composite of cellulose fibers that are strong in tension and embedded in a matrix of lignin th ...

, or

water Water (chemical formula ) is an inorganic, transparent, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth's hydrosphere and the fluids of all known living organisms (in which it acts as a ...

Phosphorus-33

³³P, a beta-emitter (0.25 MeV) with a half-life of 25.4 days. It is used in life-science laboratories in applications in which lower energy beta emissions are advantageous such as DNA sequencing. ³³P can be used to label nucleotides. It is less energetic than ³²P, giving a better resolution. A disadvantage is its higher cost compared to ³²P, as most of the bombarded ³¹P will have acquired only one neutron, while only some will have acquired two or more. Its maximum specific activity is 5118 Ci/mol.

External links

Phosphorus isotopes data from ''The Berkeley Laboratory Isotopes Project's''

References

{{Navbox element isotopes Phosphorus

Phosphorus Phosphorus is a chemical element with the symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Ear ...