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Gamma-ray continuum at > 10 MeV photon energy yields information on > 0.2 -0.3 GeV/nucleon ions at the Sun. We use the general-purpose Monte Carlo codeFLUKA (FLUktuierende KAskade) to model the transport of ions injected intothick and thin target sources, the nuclear processes that give rise to pionsand other secondaries and the escape of the resulting photons from theatmosphere. We give examples of photon spectra calculated with a range ofdifferent assumptions about the primary ion velocity distribution and thesource region. We show that FLUKA gives results for pion decay photonemissivity in agreement with previous treatments. Through the directionality ofsecondary products, as well as Compton scattering and pair production ofphotons prior to escaping the Sun, the predicted spectrum depends significantlyon the viewing angle. Details of the photon spectrum in the 100 MeV range mayconstrain the angular distribution of primary ions and the depths at which theyinteract. We display a set of thick-target spectra produced making variousassumptions about the incident ion energy and angular distribution and theviewing angle. If ions are very strongly beamed downward, or ion energies donot extend much above 1 GeV/nucleon, the photon spectrum is highly insensitiveto details of the ion distribution. Under the simplest assumptions, flaresobserved near disc centre should not display significant radiation above 1 GeVphoton energy. We give an example application to Fermi Large Area Telescopedata from the flare of 12 June 2010.

FLUKA Simulations of Pion Decay Gamma-radiation from Energetic Flare Ions