I haven’t a clue about radiation detection… but you are trying to enable and disable a timer by its supposed ID times that you haven’t actually declared first (as a timerID).
You are already using times as another variable, but if it was instead meant for a timerID it would first need to be declared as such…
int times;
times = timer.setInterval(1000, MyFunction); // example of declaring a timerID for use with enable() disable() restartTimer(), etc.