Drain salmon, reserving broth; flake salmon with a fork. In a large bowl, combine salmon, eggs, olives, celery, green onions, dill, salt and pepper. Sprinkle gelatin over salmon broth and water mixture. Set over hot water to dissolve. Combine dissolved gelatin, mayonnaise and lemon juice. Stir into salmon mixture. Spray a 3 cup (750 mL) mould with cooking spray. Spoon salmon mixture into mould. Refrigerate until firm, at least 3 hours or overnight.