From the HSE website:

Breast screening helps find cancer at an early stage. If it’s found early, it’s easier to treat and there’s a better chance of recovery. 

Breast screening involves having a mammogram of your breasts at a BreastCheck clinic or mobile screening unit. A mammogram is an x-ray of the breast used to find breast cancer when it is too small to see or feel.

You'll get a letter with your breast screening results within 3 weeks after your mammogram. The results will also be sent to your GP.

You will become eligible for breast screening once you reach the age of 50.