This article is just about a element. For a fictitious metal from either DC Comics, watch the prometheum article. For the napalm-like made-up substance in the Warhammer 40,000 scenario, see Fictional_chemical_substance.

Pm occurs as chemical element in the periodic table that has the symbol Pm & atomic number 61.

Notable characteristics
Atomic number 61 has there are no stable isotopes. These are the human-synthetic easy beta emitter; it does not emit gamma rays, but beta particles run into elements of high atomic counts might generate X-rays. Pure pm is around 2 allotropic forms, but little else is known just about a metal. Atomic number 61 salts luminesce in the dark using the light-blue or even green glow due to their high radiation.

Applications
Utilizes for pm include:

Beta radiation source for thickness gauges. Light for signals that demand reliable operation (utilizing phosphor to absorb a beta radiation & green groceries weak). Around the nuclear battery where magic eye convert the weak into electric todays, giving a utile life of astir 5 years utilizing 147-Pm. Even later as a personal X-ray source, as an auxiliary heat / power source for space probes & satellites, & to produce optical maser that may be utilized to communicate by using sunken submarines.

History
A being of atomic number 61 was 1st predicted by Bohuslav Brauner in 1902; this prediction was confirmed by Henry Moseley in 1914. Many groups claimed to keep close at hand produced a element, however it may not confirm their discoveries because of the difficulty of separating pm from either more elements. Proof of the being of atomic number 61 was found inside 1945 by Jacob A. Marinsky, Lawrence E. Glendenin and Charles D. Coryell during the analysis of byproducts of uranium fission; however, being too busy with defense-related research during World War II, they did not announce their discovery until 1947. [http://www.ornl.gov/info/ornlreview/v36_1_03/article_02.shtml] A title atomic number 61 is from either Prometheus in Greek mythology, who stole a fire of the sky & gave it to humanity.

Inside 1963, ion-exchange methods were used to develop astir X grams of pm from either atomic reactor fuel processing wastes.

Now, pm is however recovered from either a byproducts of atomic number 92 fission; it can besides become by bombarding ¹⁴⁶Nd by having neutrons, turning it into ¹⁴⁷Nd which decays into ¹⁴⁷Pm through betthe decompose by using a half-life of Eleven years.

Pm is likewise the title of a fictional element in the DC Universe; writer Marv Wolfman claims to have been unaware of a being of a very substance by that title at a period he wrote the original script featuring the title.

The substance known as atomic number 61 is likewise utilized in the war game Warhammer 40,000. These are the fictitious napalm-like inflammable poop.

Occurrence
Pm doesn't naturally occur olympian games, however has been identified in the spectrum of the star HR 465 in Andromeda, and even HD 101065 (Przybylski's star) & HD 965 [http://aanda.u-strasbg.fr:2002/articles/aa/abs/2004/21/aa0726/aa0726.html].

Compounds
Pm compounds include:

Chlorides PmCl₃ Bromides PmBr₃ Oxides Pm₂O₃

Isotopes
36 radioisotopes of promethium keep close at hand been characterized, sustaining a virtually all horse barn existence ¹⁴⁵Pm by using the half-life of 17.Heptad years, ¹⁴⁶Pm by owning the half-life of Five.53 years, & ¹⁴⁷Pm by owning the half-life of Ii.6234 years. Tons of the left over radioactive isotopes stand half-survives that come less than 364 years, & a majority one have half resides that come less than Twenty-seven seconds. This element likewise has Xi meta states with the virtually all stable existence ¹⁴⁸P1000^m (T_½ 41.Twenty-nine years), ¹⁵²Post meridiem^mDeuce (T_½ Xiii.Eight transactions) & ¹⁵²P.k.^m (T_½ Septenary.52 proceedings).

A isotopes of pm home in atomic weight from 127.9482600 u (¹²⁸Pm) to 162.9535200 u (¹⁶³Pm). A primary decay mode before the longest-lived isotope, ^{145Pm, is electron capture, and a primary mode when is beta minus decay. A primary decay products before 145Pm come neodymium (Nd) isotopes and a primary products fallowing come samarium (Sm) isotopes.}

Precautions
Pm must become handled sustaining groovy care because of its high radiation. Particularly, atomic number 61 potty emit X-rays during its beta decay. Note that its half-life is to a lesser degree that of plutonium-239 by a factor of multiple hundreds to hundreds to thousands to tens of thousands. Atomic number 61 has there are no biological role.