radiation 20.9 19.6 20.4 20.3 20.8 20.6 20.5 20.4 19.9 19.8 19.5 20.2 16.5 18.3 18.7 19.6 20 20 19.5 19.6 19.1 18.8 18.3 17.6 17.2 17.8 18.7 19 19 18.6 18.8 19 18.5 18.3 17.5 16.9 17 17.8 18.1 18.8 18.9 18.9 19.1 18.8 18.4 17.8 17 16.8