| 摘要 |
<p>A well logging tool for detecting low energy (E = 150 to 300 Kev) natural gamma rays, includes a tubular housing member (24) which is protected from direct contact with well fluids (by aluminum layer 26) and is made of an epoxy graphite composition to give high transmission of the low-energy rays. A gamma ray detector is mounted inside the housing. The epoxy graphite composition preferably is made up of graphite filament wound into tubular form and impregnated with an epoxy resin.</p> |
