X-Ray Frequently Asked Questions

X-ray Frequently Asked Questions

Q / Are x-rays dangerous?
A / A reasonable question particularly when the radiographer disappears behind a screen before making the exposure. The answer is however, not really. Background radiation makes up most of the exposure that we receive, although medical x-rays are the second most important contributor to human dose. We try to measure the possible harm of medical x-rays by the risk of possible side effects. Most people know that one of the serious side effects of x-rays is the increased risk of cancer. However the risk of most x-rays is extremely tiny because the dose is so small. For example the risk after having a chest x-ray is less than 1 in a million or about the same as one day's exposure to background radiation.
If you want to know more about the effects of x-rays the website of the NRPB has a leaflet and also details on line at
Q / Am I dangerous to anyone else?
A / No ! The x-rays last only while the exposure is being made and you do not become "radioactive" In certain examinations performed in the x-ray department this may however be important. If you visit the nuclear medicine room on this site you will find out more.
Q / Will I be able to drive afterwards?
A / Usually you will be able to carry out normal activities immediately after the x-ray but after certain procedures such as those in which dye or contrast is injected you may feel a little unwell and it may be wise for a partner or friend to drive you home.
Q / Can I bring someone to the department for moral support?
A / Yes, but we usually suggest that they stay outside during the x-ray exposure.
Q / But you said the x-ray was safe?
A / Safety of all x-rays is based on the fact that you are likely only to require a relatively small number during your lifetime and then only when the risk of not knowing what is wrong with you is greater than any risk from the x-ray. If your friend or partner comes with you he/she will be receiving an x-ray for no reason.
Q / How long will it take?
A / This depends on the type of examination. A simple chest x-ray or the x-ray of a hand or wrist takes only a few minutes, an IVP (an x-ray of the kidneys and bladder usually takes 30 to 40 minutes but may take several hours. You are usually not in the department for all this time but will have to return for additional films if your examination is one that is prolonged like this.
Q / When will I know the result?
A / Although radiographers are trained in the interpretation of some x-rays not all have this training. Not only that but if we are to give the proper attention to the review of your films this is usually done after the examination, often by a radiologist but sometimes by a specially trained radiographer. Please ask in your own hospital when your doctor is likely to receive the result.

All modality FAQ’s are reproduced with the kind permission of The Royal College of Radiologists, further information can be accessed at