Neutrino interactions with lead produce neutrons in numbers that depend on
neutrino energy and type. A detector based on lead perchlorate, for example
, would be able to measure the energy deposited by electrons and gammas in
coincidence with the number of neutrons produced. Sorting the electron ener
gy spectra by the number of coincident neutrons permits the identification
of the neutrino type that induced the reaction. This separation allows an a
nalysis which can determine the temperatures of nu (e) and (v) over bar (e)
from a supernova in one experiment. The neutrino reaction signatures of le
ad perchlorate, and the fundamentals of using this material as a neutrino d
etector, are described.