The conceptual scheme of an ecologically clean thermal neutron source
(TNS) based on muon-catalyzed fusion (MCF) is proposed. The preliminar
y design shows that an MCF-based TNS can produce the maximum value of
unperturbed thermal neutron flux 10(15) n/cm(2) s using for muon produ
ction a beam power of about 14 MW supplied by an accelerator of the ne
xt generation.