FIELD: physics.
SUBSTANCE: downhole tool has a neutron source configured to emit neutrons according to a pulse formation scheme, the pulse formation scheme comprising a delay between two pulses, the delay being sufficient for all neutron capture events caused by emitted neutrons to substantially stop, and the delay is longer than or equal to about 1 s; a gamma-radiation detector configured to detect activation gamma-radiation generated when neutron radiation activated elements decay to a non-radioactive state.
EFFECT: enabling determination of a formation element using only activation gamma-radiation from activated formation nuclei.
23 cl, 10 dwg
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