  We propose a new technique for the calibration of nuclear recoils in large
noble element dual-phase time projection chambers used to search for WIMP dark
matter in the local galactic halo. This technique provides an $\textit{in
situ}$ measurement of the low-energy nuclear recoil response of the target
media using the measured scattering angle between multiple neutron interactions
within the detector volume. The low-energy reach and reduced systematics of
this calibration have particular significance for the low-mass WIMP sensitivity
of several leading dark matter experiments. Multiple strategies for improving
this calibration technique are discussed, including the creation of a new type
of quasi-monoenergetic 272 keV neutron source. We report results from a
time-of-flight based measurement of the neutron energy spectrum produced by an
Adelphi Technology, Inc. DD108 neutron generator, confirming its suitability
for the proposed nuclear recoil calibration.
