I have to correct something that you said. I did not say that technetium was the only isotope used for diagnosing cancer. For diagnosing most types of cancer, we have fluorodeoxyglucose, fluorine 18, sodium fluoride, that emit positrons. We use positron emission tomography.
What I was trying to say earlier to Mr. David McGuinty was that we are very reluctant to use positron emission tomography for children because the level of radiation is more intense. Children have priority. You no doubt know the saying "women and children first". In nuclear medicine, we apply this principle when there is a shortage.