During the past 15 years a broad range of cryogenic particle detectors have
been developed primarily for asc in astro-particle physics, nuclear physic
s and material science. Among these, calorimetric detectors play an importa
nt role. In particular, micro calorimeters have proven to be a suitable too
l for the detection of x-rays. We will discuss the concept of calorimetric
particle detectors and the results for x-ray detection obtained with differ
ent types of calorimeters.