  In order to investigate the anomalous heat effect (AHE) in NiCu multilayer
thin film, photon radiation calorimetry has been developed. Three types of
photon detectors are employed to cover a wide range of wavelengths from 0.3 nm
to 5.5 um, i.e., photon energies from 0.2 to 1.8 eV. In the present work, the
usefullness of the calorimetry is demonstrated for excess heat measurements
with samples of Ni pure, NiCu composite layers, and Cu layer deposited on the
Ni substrate. Direct comparisons of photon radiation spectra with and without
H2 easily showed sample-specific differences in excess heat power. The samples
of NiCu composite layer produced larger excess heat. By incorporating the
measured radiant power into a heat flow model, the excess heat was deduced to
be 4 - 6 W. The energy generated in 80 hours reached to 520 +/- 120 kJ: the
generated energy per hydrogen was at least 460 +/- 108 keV/H atom. This is
definitely not a chemical reaction, but producing energy at the level of
nuclear reactions.
