[en] It is shown that a thermoluminescent (TL) sheet stack detector, consisting of TL sheets and medical x-ray films, is an effective nuclearite detector. Nuclearite energy loss is not explicitly used for the estimation of the TL stack sensitivity to nuclearites, but implicitly by considering ways of energy deposition. The 90% confidence level flux limit obtained with the TL stack detector is given for a certain β-M range of nuclearites. For nuclearites of β=10^-3 at sea level and M≥2x10¹⁵ GeV c^-2, the limit is 1.3x10^-13 s^-1 cm^-2 sr^-1. (author)