Oh dear Missybusy it sounds like you work with a pile of drama queens who like to over dramatise everything and they should be on stage in a play.
If they/you have any concerns the people to contact are your chemo oncologist or the chemo nurses who helped administer your chemo. You should have recieved an explanation sheet of the risks. Contact them and let them put your drama queen colleagues at peace of mind that they aren't going to become radioactive or catch your dreaded disease of BC and that this is only a precaution of which you didn't even really need to let them know but you did so out of decency and doing the right thing.
I sincerely hope that your work place comes to the party quickly and understands where you are coming from and that at this very stressful and crucial time in your journey you need support not ostresising (spelling sorry). Surely someone in your office has been touched by cancer before being either themself or there loved ones so showing you a bit of compassion would be the way to go.
I sincerely hope that things get back to normal and you can carry on working in your workplace and that your colleagues can manage to show some empathy and compassion for someone who is travelling the BC rough road journey.
Wishing you strength to not only deal with your so called comrades but to get through the pot holes you will find along the road.
All I can add is keep on trucking and if they see your truck comin hopefully they will get out of your way.
Stay strong, we are here for you and we do understand what you are going through,lots of love, Mich xoxoxoxo