Tuberculosis is a rare disease in Finland. It has been almost completely eradicated due to good medical care. If you come from a country categorised in a risk group where the occurrence of tuberculosis is high, you may have the disease and infect those around you without knowing.
As you plan to stay in Finland for more than three months, you have the right to a free chest X-ray. The X-ray is voluntary. Its purpose is to examine whether your lungs show any changes indicative of tuberculosis.