Neutron soil moisture gauge
Fast Neutron Moisture Meter
insert-type neutron gauge
neutron-neutron(n-n)logging
neutron epithermal neutron log
neutron thermal neutron log
Moisture absorption or moisture desorption
moisture regain and moisture retaining quality
~(241)Am-Be neutron source
~(241)Am-Be neutron source element
~(252)Cf neutron source
~(252)Cf 中子源
~(252)Cf中子源
252Cf中子源