protactinium
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protactinium
(Pa) [pro″tak-tin´e-um]a chemical element, atomic number 91, atomic weight 231. (See Appendix 6.)
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
pro·tac·tin·i·um (Pa),
(prō'tak-tin'ē-ŭm),A radioactive element, atomic no. 91, atomic wt. 231.03588, formed in the decay of uranium and thorium; its most long-lived isotope, 231Pa, has a half-life of 32,500 years.
Synonym(s): proactinium, protoactinium
[G. prōtos, first]
Farlex Partner Medical Dictionary © Farlex 2012
pro·tac·tin·i·um
(Pa) (prō'tak-tin'ē-ŭm)A radioactive element, atomic no. 91, atomic wt. 231.03588, formed in the decay of uranium and thorium; its longest-lived isotope, 231Pa, has a half-life of 32,500 years.
[G. prōtos, first]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012