| 摘要 |
<p>A PET radiation detector includes a pair of amplifying gaps (3, 21) to enhance the electron yield from a TAME gas, BaF2 gamma detector, together with a gate electrode (17) to inhibit passage of charge to the detector electrodes and reverse passage of ions to the crystal. A further reverse-biased gap may be positioned adjacent the crystal to prevent charge build-up thereon. Shield electrodes (23, 25) prevent gate switching signals causing spurious responses in the detector circuit.</p> |
