Pulsed-neutron formation density

A logging system comprising:

• a logging tool comprising:
• a sonde operable within a bore hole;
• a neutron source coupled to the sonde, the neutron source operable to produce high energy neutrons;
• a near gamma ray detector coupled to the sonde at a first distance from the neutron source;
• and
• a far gamma ray detector coupled to the sonde at a second distance from the neutron source, the second distance greater than the first distance;
• a processor coupled to the neutron source and the near and far gamma my detectors;
• and
• wherein the processor calculates a compensated inelastic gamma ray count rate for a formation surrounding the logging tool, the compensated inelastic gamma ray count rate calculated by modifying actual inelastic gamma ray count rates in an amount proportional to the effect of neutron transport.

A logging system comprising:

• a logging tool comprising:
• a sonde operable within a bore hole;
• a neutron source coupled to the sonde, the neutron source operable to produce a substantially known quantity of high energy neutrons;
• a gamma my detector, the gamma ray detector disposed within the sonde at a spaced apart location from the neutron source;
• and
• a processor coupled to the logging tool;
• wherein the processor is operable to compensate an inelastic gamma ray count rate for neutron transport effects to create a compensated inelastic gamma my count rate.