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Complex, transient, spatially itihomogeneous tokamak plasmas require careful diagnosis. As the reactor regime is approached, soft X : ays become more important as a versatile diagnostic tool and an energy-loss-echanism. Continuum emission provides a measure of electron temperature ;. id light impurity content. Impurity lines serve as a probe for ion and electron temperature, impurity behavior, and radiative cooling. The entire spectrum yields vital information on instabilities and disruptions. The importance of impurities is illustrated by the extensive efforts toward understanding impurity production, effects, and control. Minute heavy impurity concen trations can prevent reactor ignition. Si(Li)-detector arrays give a broad overview of continuum and line x-ray emission (-,3-50 keV) with moderate energy (200 eV) and time (50 ms) resolution. Bragg crystal and grating spectrometers provide detailed information on impurity lines with moderate to excellent (E/AE = 100-23,000) resolving power and 1-50 ms time resolution. Imaging detector arrays measure rapid (~ 10 ys) fluctuations due to MHD instabilities and probe impurity behavior and radiative cooling. Future tokamaks require more diagnostic channels to avoid spatial scanning, higher throughput for fast, single-shot diagnosis, increased spectral PPPL-1807 DES2 009817 information per sample period via fast scanning or use of multi-element detectors with dispersive elements, and radiation shielding and hardening of detectors. This report