If they are not available in yours, you could check with either your oncologist or gynecologist. If they don't have them, which they may not, they can get them. The nurse in my radiation department gave me a dilator and some Surgilube lubricant. She also gave me a copy of a section of an American Cancer Society booklet which has directions as to how to use a vaginal dilator after radiation treatments. The directions can be used for after chemo treatments too.
Dilators also help women learn to relax the vaginal muscles.
Dilators come in many forms. Vaginal dilators are often used after radiation to the pelvis, cervix, or vagina. The only real alternative to using a vaginal dilator is to have intercourse a few times a week. Since scarring in the pelvis after radiation can develop over many years, you should follow this scheule for the rest of your life. Your doctor may suggest a certain way to use the dilator.