Thank you for your query
I don't mean to scare you but it was not a good idea to keep close to your child while in a radiation
therapy. At least for now try to arrange some one to take care of your child. Blankets etc don't prevent transmission of radiation. Only lead shields can do that and they are not available in some one's house. Stay in different rooms at least. Radiation can be decreased by increasing distance, reducing time of exposure and shielding (lead shields or thick walls). Even young adults who have future fertility
potential should not be allowed to come near. An elderly person is the best bet. However there are not going to be any immediate effects so you don't need to rush. But definitely consult your physician, the next time you visit. But for now try to avoid any further exposure. I hope your child has not been exposed much. And not everyone exposed faces problems. I am sure your child too will not have any thing to worry about. But still it will be a good idea to consult.
Hope that helps.
God bless you