RADIATION DETECTOR Russian patent published in 1997 - IPC

FIELD: detection and recording of radioactivity in water medium in high external light background. SUBSTANCE: Cerenkov radiation detector has photosensitive cell of photodetector sensing in closest ultrasonic region of spectrum and sun-blind filter installed at input of photosensing cell. Sun-blind filter has air-insulated potassium layer applied to transparent substrate, stabilizing layer, and interference filter. Spectral transmission coefficient of sun-blind filter meets condition , where ; Φ_ph(λ) is photo flux density of neutral light background; Φ_e(λ) is photo flux density of Cerenkov radiation; ε(λ) is spectral sensitivity of photosensitive cell in relative units; λ_b is boundary wavelength found from condition Φ_e(λ_b) = Φ_ph(λ_b). EFFECT: improved design. 2 cl, 14 dwg, 2 tbl