The Radium Rifle is a high-tech, post-apocalyptic weapon with a sleek, retro-futuristic design. It features a long, angular barrel with visible radiation coils and a stock made of weathered metal and worn leather. The rifle's body is primarily metallic with a matte finish, adorned with glowing green radioactive elements and intricate engravings that hint at its deadly radiation-based ammunition. The weapon emits a faint green glow, emphasizing its radioactive nature.