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Updated: Aug 17, 2025
Non-chromatographic Purification of Recombinant Elastin-like Polypeptides and their Fusions with Peptides and Proteins from Escherichia coli
Published on: June 9, 2014
POLYETHYLENE FILTER FOR THE TNF2 THERMAL NEUTRON FACILITY
Achilles Astuto1, Karla C S Patrão2, Evaldo S Fonseca2
1Universidade Federal do Rio de Janeiro - COPPE/UFRJ. Av. Horácio Macedo, 2030, Bloco G/Sala 206 - Centro de Tecnologia - Cidade Universitária, Ilha do Fundão, Rio de Janeiro 21941-914, RJ, Brasil.
Abstract:
The Standard Thermal Neutron Flux Unit, TNF2, in (LNMRI/IRD)(1, 2), was built for neutron detector and survey meter calibrations. The facility's fluence is achieved by moderation of four 241Am-Be with a graphite core and paraffin/graphite blocks surrounding it. Due to the small channel dimensions, it is impossible to calibrate personal dosemeters and survey meters for thermal neutrons. A polyethylene filter construction was carried out to allow the external irradiation of personal dosemeters and neutron survey meters. The polyethylene filter was constructed with 29 stacked discs with diameters ranging from 5 to 34 cm. Different thicknesses were simulated to provide the desired effect. This new irradiation configuration was also experimentally tested and compared with simulation results with MCNPX(3).
