Mr HAWORTH (ISAACS, VICTORIA) - I address a question to the Minister for Health, and wish to state by way of explanation that the National Radiation Advisory Committee under the chairmanship of Sir Macfarlane Burnet decided to advise the strict tightening-up of health laws throughout the Commonwealth. One of the most important of the committee's recommendations was that, in future, all types of leukaemia should be notifiable diseases. The other recommendation was that radiation doses to the individual arising from the medical use of X-rays for diagnostic purposes should be reduced without delay by administrative and technical action. Will the Minister inform the House whether any action has been taken, or is contemplated, in this matter by all the State governments in making use of the model act and regulations prepared by the National Health and Medical Research Council?