Achieving alpha detection via radioluminescence is a new method for surface contamination detection. The range of photons from alpha-induced luminescence in gases far exceeds that of alpha particles, enabling a remote detection of alpha radiation. The emission of near-ultraviolet photons in the range of 300–400 nm, resulting from the radiative relaxation of nitrogen molecules, constitutes the principal source of alpha-induced radioluminescence in the air. Within this region, the intense solar irradiance and artificial lighting make it hard to detect under bright environments. However, the radioluminescence of argon in the solar blind region provides a new avenue for measurements under bright lighting. In this work, we used a monochromator to measure the spectra of radioluminescence from argon excited by alpha particles. The optical devices used was calibrated for correction coefficients across the measurement wavelength range to correct the intensities of the measured spectral lines. The study shows that argon can significantly enhance radioluminescence in the solar blind region. This work can be utilized to guide the design of future remote alpha detection devices in the solar blind region, providing effective detection for the transportation and storage of alpha-emitting materials, thereby offering support for applications in the fields of nuclear safety and security.