  We present the image and catalogue of the 14.3 micron shallow survey of 0.55
square degrees in the region of the Lockman Hole (10h52m03s +57d21m46s, J2000)
with the Infrared Space Observatory (ISO). The data have been analyzed with the
recent algorithm by Lari et al. (2001) conceived to exploit ISO data in an
optimal way, especially in the case of shallow surveys with low redundancy.
Photometry has been accurately evaluated through extensive simulations and also
the absolute calibration has been checked using a set of 21 stars detected at
14.3 micron, optical, and near-IR bands. On the basis of simulations, we
evaluate that the survey is 80%, 50%, and 20% complete at 0.8, 0.6, and 0.45
mJy, respectively. Below the 20% completeness limit, fluxes are generally
overestimated since the sources are preferentially detected if their positions
correspond to positive oscillations of the noise. Moreover, from a comparison
with the deep survey, we estimate that only sources brighter than 0.45 mJy are
highly reliable. Only 5% of these sources do not have optical counterparts down
to r'=25. Since none of the Spitzer imaging bands cover the 14.3 micron
wavelength range, this data set will remain unique until the advent of the
James Webb Space Telescope.
