Data for Identification algorithm of low-count energy spectra under short-duration measurement based on heterogeneous sample transfer

The detection unit, enclosed within a seismic-resistant and waterproof stainless steel container, utilized a NaI(TI) crystal measuring Ø63x63mm to record gamma radiation from controlled radionuclides, exhibiting a typical resolution of 7.5\% at 662keV (${ }^{137}\mathrm{Cs}$). Detection energy range of the spectrometer spanned from 70keV to 3MeV. Measurement experiments were conducted in a laboratory setting.

A specific open area within the laboratory was chosen as a fixed point. A ruler was placed on the ground, with the radiation source positioned at the origin of the ruler. The spectrometer was then moved to alter variables such as the relative distance from the source and the measurement angle.