Neutron activation log

{
  "id": "MLC-T-OAG-002531",
  "term": "Neutron activation log",
  "field": "Oil and gas",
  "definition": "A nuclear log in which a neutron source makes stable nuclei near the tool radioactive, and detectors then count the delayed gamma rays emitted as they decay. In production logging the best-known use activates oxygen in flowing water to detect and time its movement, inside the casing or behind it. The activated oxygen-16 turns into nitrogen-16, which has a half-life of about 7 seconds.",
  "subject": "Production Logging",
  "url": "https://mlchart.com/terminology/oil-and-gas/neutron-activation-log/"
}