Peter P. Antich

Position sensitive gamma ray detector

SummaryA position-sensitive gamma-ray detector made of scintillating glasses and MWPCs is described. The detector works in the energy range between 50 and 300 MeV. The energy resolution of the detector results to beσ(E) = 0.87 √E MeV while the position incertude is ≈1 mm. The measured performances of the detector are compared with Monte Carlo calculation.RiassuntoNell’articolo viene descritto un rivelatore di raggi gamma, sensibile alla posizione, costituito di vetri scintillanti e camere proporzionali multifilo. Il rilevatore lavora in un intervallo di energia compreso tra 50 e 300 MeV. La risoluzione energetica risulta essere (E)=0.87·E1/2 MeV, mentre la incertezza sulla posizione è ≈1 mm. Le prestazioni del rivelatore, verificate sperimentalmente, sono paragonate con un calcolo Monte Carlo.

19F LABELLED DEXTRANS AND ANTIBODIES AS NMR IMAGING AND SPECTROSCOPY AGENTS

19 F labelled compounds are disclosed which are useful in methods of NMR imaging and spectroscopy. The compounds comprise a 19 F-containing sensor moiety, and a transport polymer or substrate, and can optionally also comprise a spacer moiety to separate the sensor moiety and the transport polymer.

A diverging gynecological template for radioactive interstitial/intracavitary implants of the cervix

The Syed-Neblett perineal template has been in use at our institution since 1984. We have occasionally encountered problems in inserting the needles through the peripheral rows of the template and have seen significant convergence of the needles cephalad to the template. To solve these problems we have modified the Syed-Neblett template. In the new design, the entrance holes are closer together than in the original template, but they are angled so as to achieve a more compact design while maintaining a dose distribution close to that of the Syed-Neblett design. We have seen significantly fewer clinical problems with this design. In addition, a smaller number of needles achieve the same dose distribution; this simplifies their visualization on radiographs.