Provided is a glass for radiation detection having high fluorescence detection sensitivity and high weather resistance. A glass for radiation detection, comprising, in mol%, 0.1 to 30% of SiO 2 +B 2 O 3 , 0 to 20% of SiO 2 , 0 to 10% of B 2 O 3 , 40 to 70% of P 2 O 5 , 10 to 30% of Al 2 O 3 , 10 to 30% of Na 2 O, and 0.01 to 2% of Ag 2 O.