This tool sub of the 4000 Stack Tools Series records the neutron porosity of the formation, short and long neutron counts. It must be used with the 4000 Stack Gamma Ray Tool Sub, which provides the needed telemetry. It is compatible with the 4239 Stack Density Tool Sub.
1. Neutron Detector, Far Spacing
2. Neutron Detector, Near Spacing
3. Neutron Porosity
4. Radioactive Source