Final answer:
Flash radiography is the radiographic technique where the tube current can reach 2000 A but the exposure is microseconds in duration.
Step-by-step explanation:
The radiographic technique in which the tube current can reach 2000 A but the exposure is microseconds in duration is called Flash radiography. In flash radiography, a low-resistance ionized gas in the flash tube produces a rapid flash discharge that can be less than a microsecond in duration. This technique allows for capturing a brief instant of a rapid motion with extremely intense flashes.