self-luminous signs illuminated by radioactive gaseous tritium, have been used for decades in advanced countries such as the United Kingdom, Canada and the United States without any reported health incidents. Following is a question by the Hon Albert Ho, and a written reply by the Secretary for Food and Health, Dr Ko Wing-man, in the Legislative Council today (March 27): Question: I have been advised by some members of the building services industry that tritium exit signs (TES), i.e.
