What is a dirty bomb? How much can this bomb shake the enemy's chest?

What is a dirty bomb? How much can this bomb shake the enemy's chest? The Russian-Ukraine war is swirling in a jam of words. The situation is getting worse day by day. The battle is going on in the battlefield, along with the war of words between the two countries is going on. Until now, Russia has been threatening nuclear attacks in advance. This time they raised the opposite accusation, Ukraine is looking for an opportunity to use dusty bombs. Such complaints have been heard for the past few days. Moscow did not stop with complaints, they raised the issue in the UN Security Council. The Kremlin says Ukraine plans to use 'dirty bombs' on its own territory to pin the blame on Russia.