Limits on the release of Rb isotopes from a zeolite based 83mKr calibration source for the XENON project

The isomer 83mKr with its half-life of 1.83 h is an ideal calibration source for a liquid noble gas dark matter experiment like the XENON project. However, the risk of contamination of the detector with traces of the much longer lived mother isotop 83Rb (86.2 d half-life) has to be ruled out. In this work the release of 83Rb atoms from a 1.8 MBq 83Rb source embedded in zeolite beads has been investigated. To do so, a cryogenic trap has been connected to the source for about 10 days, after which it was removed and probed for the strongest 83Rb gamma-rays with an ultra-sensitive Germanium detector. No signal has been found. The corresponding upper limit on the released 83Rb activity means that the investigated type of source can be used in the XENON project and similar low-background experiments as 83mKr generator without a significant risk of contaminating the detector. The measurements also allow to set upper limits on the possible release of the isotopes 84Rb and 86Rb, traces of which were created alongside the production of 83Rb at the Rez cyclotron.Comment: 11 pages, 7 figures, submitted to Journal of Instrumentatio

Biochemicals ; Immunochemicals

xxiii;ill.;992hal.;30c

Chemicals Diagnostics

ill.;1344hal.;30c

Hochsensitive Erfassung von Nukleinsaeuren durch Biosensoren in biologischen Praeparaten. Teilprojekt: Immobilisierung von Nukleasevarianten Schlussbericht

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Onsite Gase und Chemikalien (MEDEA T612) Abschlussbericht

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Die Nutzung hepatischer Funktionen fuer in vitro-Verfahren zur Pruefung von Stoffen mit dem Ziel der Einsparung von Tierversuchen. Teilprojekt 16: Standardisierung und Weiterentwicklung von in vitro-Metabolisierungssystemen mit kryokonservierten Hepatozyten des Beagle-Hundes Abschlussbericht

Available from TIB Hannover: DtF QN1(68,33) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman