Downhole Neutron Activation Measurement

摘要

Systems and methods for measuring neutron-induced activation gamma-rays in a subterranean formation are provided. In one example, a downhole tool for measuring neutron-induced activation gamma-rays may include a neutron source and a gamma-ray detector. The neutron source may emit neutrons according to a pulsing scheme that includes a delay between two pulses. The delay may be sufficient to allow substantially all neutron capture events due to the emitted neutrons to cease. The gamma-ray detector may be configured to detect activation gamma-rays produced when elements activated by the emitted neutrons decay to a non-radioactive state.

主权项

1. A downhole tool comprising:
a neutron source configured to emit neutrons according to a pulsing scheme, wherein the pulsing scheme includes a delay between two pulses, wherein the delay is sufficient to allow substantially all neutron capture events due to the emitted neutrons to cease; and a gamma-ray detector configured to detect activation gamma-rays produced when elements activated by the emitted neutrons decay to a non-radioactive state.