ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
Young Members Group
The Young Members Group works to encourage and enable all young professional members to be actively involved in the efforts and endeavors of the Society at all levels (Professional Divisions, ANS Governance, Local Sections, etc.) as they transition from the role of a student to the role of a professional. It sponsors non-technical workshops and meetings that provide professional development and networking opportunities for young professionals, collaborates with other Divisions and Groups in developing technical and non-technical content for topical and national meetings, encourages its members to participate in the activities of the Groups and Divisions that are closely related to their professional interests as well as in their local sections, introduces young members to the rules and governance structure of the Society, and nominates young professionals for awards and leadership opportunities available to members.
Meeting Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
Latest Magazine Issues
Jun 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
August 2025
Nuclear Technology
July 2025
Fusion Science and Technology
Latest News
NextGen MURR Working Group established in Missouri
The University of Missouri’s Board of Curators has created the NextGen MURR Working Group to serve as a strategic advisory body for the development of the NextGen MURR (University of Missouri Research Reactor).
J. R. Ferraro, D. F. Peppard
Nuclear Science and Engineering | Volume 16 | Number 4 | August 1963 | Pages 389-400
Technical Paper | doi.org/10.13182/NSE63-A26550
Articles are hosted by Taylor and Francis Online.
From freezing-point and isopiestic studies, it has been found that the acidic organophosphorus extractants of the type (GO)2PO(OH) and GOG′PO(OH) (where G is aryl, alkyl, or a derivative thereof) are predominantly dimeric in nonpolar diluents, such as n-hexane, cyclohexane, benzene, and carbon tetrachloride. The dimers are very stable and appear to monomerize only in more polar solvents, such as acetone, chloroform, or ethanol. Infrared spectra of these acids have been made, and the positions of the phosphoryl absorption determined in terms of the electronegativity of the G group. It is concluded from these studies that for the acids (GO)2PO(OH) an ionic P+O− and a strong acid is the better extractant; while for the acids GOG′PO(OH) a phosphoryl group with high double bond character and a strong acid is a better extractant. For both acid types these criteria are provided whenever the G group is highly electronegative. Complexes of organophosphorus extractants with metallic nitrates have been studied by infrared methods and it has been concluded that the nitrate spectra is of lowered symmetry than is present in ionic nitrate spectra, indicating a higher degree of covalency in the metal to nitrate band. Examples of these complexes are RE(NO3)3·2TBP (where RE is a rare earth metal, TBP is tri n-butyl phosphate) and M(NO3)(DEHP)3 (where DEHP is bis-(2-ethylhexyl)phosphoric anion). Infrared investigations of the salts of the acidic organophosphorus extractants have indicated the appearance of 2-POO− absorptions (asymmetric and symmetric). The asymmetric absorption appears to vary (1200–1282 cm−1) with the nature of the G group (being at higher frequency where G is aryl), and with the ionic potential of the metal (being at higher frequency as the ionic potential increases). Recent ultraviolet and infrared studies of complexes of the type M/TTA/TBP have been made and certain structures for these compounds have been indicated.
