http://theshopsonelpaseo.com/?syzen=%D8%B4%D8%B1%D8%A7%D8%A1-%D8%A7%D9%84%D8%B0%D9%87%D8%A8-%D8%A8%D8%B3%D8%B9%D8%B1-%D8%AA%D9%86%D8%A7%D9%81%D8%B3-%D8%A7%D9%84%D8%A3%D8%B3%D9%88%D8%A7%D9%82&cb0=34 Stringent legislation on the transport and handling of radioactive materials increasingly prevents use of conventional density logging probes. The small-source density probe provides calibrated and borehole-compensated density logs at sensible logging speeds using a very low activity 60Co gamma source that may not require a radiation licence in certain territories.
Principle of Measurement:
إشارة ويكيبيديا The probe contains a detachable collimated gamma source and two high-sensitivity scintillation gamma detectors. The detectors are protected against direct radiation from the source or via the borehole by extensive heavy- metal shielding. The active windows of source and detector are maintained in contact with the borehole walls by a motorised caliper arm. The detected backscattered gamma radiation depends on the formation density. The probe includes a third gamma detector mounted remotely from the source for ‘stripping’ natural background radiation.