Dosimeter for radon and radon daughter products

Doubly-compensated dual-detector density logging apparatus

Down hole gas analyzer method and apparatus

Down-hole probe assemblies

Downhole carbon dioxide gas analyzer

Downhole device to detect differences in fluid density

Downhole fluid spectroscopy

Downhole gamma-ray detection

Downhole nuclear tool

Downhole sensing with fiber in exterior annulus

Dual compensated chlorine logging tool

Dual detector pulsed neutron logging for providing indication of

Dual scintillation detector for determining grade of uranium ore

Dual spaced, borehole compensated neutron well logging instrumen

Dual spectra well logging system and method

Dual spectra well logging system and method

Earth formation density measurement from natural gamma ray spect

Earth formation porosity determination with dual epithermal neut

Earth formation porosity log using measurement of fast neutron e

Earth formation pulsed neutron porosity logging system utilizing