RESUMEN
We recently developed a one-dimensional imager of neutrons on the Z facility. The instrument is designed for Magnetized Liner Inertial Fusion (MagLIF) experiments, which produce D-D neutrons yields of â¼3 × 1012. X-ray imaging indicates that the MagLIF stagnation region is a 10-mm long, â¼100-µm diameter column. The small radial extents and present yields precluded useful radial resolution, so a one-dimensional imager was developed. The imaging component is a 100-mm thick tungsten slit; a rolled-edge slit limits variations in the acceptance angle along the source. CR39 was chosen as a detector due to its negligible sensitivity to the bright x-ray environment in Z. A layer of high density poly-ethylene is used to enhance the sensitivity of CR39. We present data from fielding the instrument on Z, demonstrating reliable imaging and track densities consistent with diagnosed yields. For yields â¼3 × 1012, we obtain resolutions of â¼500 µm.
RESUMEN
A multiinstitution collaboration is developing a neutron imaging system for the Sandia Z facility. The initial system design is for slit aperture imaging system capable of obtaining a one-dimensional image of a 2.45 MeV source producing 5x10(12) neutrons with a resolution of 320 microm along the axial dimension of the plasma, but the design being developed can be modified for two-dimensional imaging and imaging of DT neutrons with other resolutions. This system will allow us to understand the spatial production of neutrons in the plasmas produced at the Z facility.
RESUMEN
Se realizó un estudio histopatológico de 11 biopsias gingivales en pacientes con gingivitis crónica y periodontitis de aparición tardía y temprana, clasificados de acuerdo con los criterios clínicos y radiológicos establecidos, con el objetivo de conocer las características histopatológicas y, fundamentalmente, el infiltrado inflamatorio en estas tres entidades. Para ello se tomó muestra del tejido gingival por incisión y se transportó a -180oC al laboratorio de Anatomía patológica para su inclusión y corte por congelación; las láminas se colorearon con hematoxilina y eosina para su evaluación histológica por técnicas convencionales de microscopia óptica. Los resultados mostraron patrones histopatológicos con lesiones inmunopatológicas, que son cualitativamente más destructivos en la periodontitis de aparición temprana, lo que indica una menor capacidad de defensa de la respuesta inmune local en estos pacientes(AU)