Chemical characterization of short-lived selenium and their daughter isotopes from thermal neutron induced fission of 235U at a gas-jet facility

M. Wachsmuth; B. Eichler; L. Tobler; F. Hänssler; H. Gäggeler; M Ammann

doi:10.1023/a:1020878506388

Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 254: Issue 1

Chemical characterization of short-lived selenium and their daughter isotopes from thermal neutron induced fission of 235U at a gas-jet facility

Authors:

M. Wachsmuth

M. Wachsmuth Paul Scherrer Institut Laboratory for Radio- and Environmental Chemistry CH-5232 Villigen Switzerland

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B. Eichler

B. Eichler Paul Scherrer Institut Laboratory for Radio- and Environmental Chemistry CH-5232 Villigen Switzerland

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L. Tobler

L. Tobler Paul Scherrer Institut Laboratory for Radio- and Environmental Chemistry CH-5232 Villigen Switzerland

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F. Hänssler

F. Hänssler Paul Scherrer Institut Laboratory for Radio- and Environmental Chemistry CH-5232 Villigen Switzerland

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H. Gäggeler

H. Gäggeler Paul Scherrer Institut Laboratory for Radio- and Environmental Chemistry CH-5232 Villigen Switzerland

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M Ammann

M Ammann Paul Scherrer Institut Laboratory for Radio- and Environmental Chemistry CH-5232 Villigen Switzerland

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Pages:: 201–208

Online Publication Date:: 22 Dec 2004

Publication Date:: 17 Oct 2002

Article Category:: Research Article

DOI:: https://doi.org/10.1023/a:1020878506388

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Abstract

Selenium nuclides are available from thermal neutron induced nuclear fission of ²³⁵U at the gas-jet facility at the Swiss spallation neutron source (SINQ) at Paul Scherrer Institute, Switzerland. The formation of stable selenium compounds, their transport yields using the gas-jet system and their relative thermal decomposition temperature were investigated under oxidizing and reducing conditions in the target chamber. Using O₂, H₂, CO, and propene as additional gases, the selenium isotopes are suggested to form H₂SeO₃, H₂Se, COSe, and C₃H₆Se, respectively, with overall ⁸⁴Se yields of 1.5%, 4.7%, 6.3%, and 21.9%, respectively. Adsorption enthalpy, vapour pressure, solubility and acidity data for these species were collected from the literature or estimated from other known thermochemical properties. Carrier free bromine isotopes (⁸⁴Br, ⁸⁶Br) in the form of HOBr were obtained by thermally decomposing H₂SeO₃ and retaining elemental Se under oxygen rich conditions on quartz at 400 K.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)