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Comparison of mechanistic model with experimental observation: The Ar(2p2)→Ar(1s4) emission signal in the pulse radiolysis of argon (1991)

Richmann, Michael K. ; Firestone, Richard F.

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 95 (1991), S. 963-970

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ISSN: 1089-7690

Source: AIP Digital Archive

Topics: Physics , Chemistry and Pharmacology

Notes: The temporal behavior of atomic and molecular ions and of several classes of neutral states lying above the Ar(1s) manifold has been mathematically modeled in a successful attempt to reproduce observed Ar(2p2)–Ar(1s4) emission signals at 296 K with Ar pressures in the 100–200 Torr region. In addition, traces of SF6 were added to remove the effects of the slow electron thermalization associative ionization cycle characteristic of pure Ar. The proposed model mechanism necessarily includes additional reaction steps required by the addition of SF6. Good agreement was obtained between observed and calculated emission profiles only after the introduction of Ar+2 as an important thermalizer of fast electrons in pure Ar. Previously published rate constant values for the various elementary steps assumed to comprise a simplest probable mechanism were found to be generally acceptable.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.461051

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Radiotoxicity of plutonium in NTA-degrading Chelatobacter heintzii cell suspensions (1999)

Reed, Donald T. ; Vojta, Yori ; Quinn, John W. ; [et al.]

Springer

Biodegradation 10 (1999), S. 251-260

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ISSN: 1572-9729

Keywords: Bioprocessing ; bioremediation ; Chelatobacter heintzii ; nitrilotriacetic acid ; plutonium ; radiotoxicity

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract The radiotoxicity of plutonium in NTA-degrading Chelatobacter heintzii cell suspensions was investigated as part of a more general study to establish the key interactions between actinide-organic complexes and microorganisms in the subsurface. The radiation tolerance of C. heintzii, based on 60Co gamma irradiation experiments, was 165 ± 30 Gy. No bacteria survived irradiation doses greater than 500 Gy. In the presence of plutonium, where alpha particle decay was the primary source of ionizing radiation, the observed toxicity was predominantly radiolytic rather than chemical. This was evident by the greater effect of activity, rather than concentration, on the toxicity noted. Bioassociation of plutonium with C. heintzii was postulated to be an important and necessary step in the observed loss of cell viability since this was the best way to account for the observed death rate. The radiotoxicity of plutonium towards bacteria is a potentially important consideration in the bioremediation of sites contaminated with radionuclide-organic mixtures and the bioprocessing of nuclear waste.