xamm

i applied for my visa after living in s.e asia for over 6 months and they required a chest x-ray so as to check i didnt have TB. I was successful in my application (and no TB!) i have since been back to s.e. asia for again 6 months, i am about to fly into australia in time to start my working visa, will i need another x-ray do we think for the second time spent in s.e asia? ive had a google but cant really find anything about it, my australian friends think lill be fine, however i dont want to waste all the money on flights visas etc and then not get in! thanks in advance