Your child may have radiotherapy in the location of the original (primary) tumour to ensure any cancer cells remaining from induction chemotherapy, surgery and high-dose chemotherapy are killed off. The goal is to reduce the chances of the cancer coming back in that area. In some cases your child may have to have radiotherapy whilst under general anaesthetic as they will need to be very still for the treatment to be administered effectively. 

It uses high energy x-rays to kill the cancer cells in daily fractions over the course of three to five weeks. 

It's administered using a radiotherapy machine and your child won't feel anything during treatment.  

There are some short-term side-effects like possible skin reactions, nausea/diarrhoea and tiredness. As your child is being exposed to significant levels of radiation, there may be precautions that need to be in place when coming into contact with others. This will depend on the type of radiation being given, and you can find out more about this from your healthcare provider.