Does Thermal Radiation from Ordinary Materials Span All Wavelengths?

[titansarus]

Hi.

I want to know does thermal radiation contain all the wavelengths (from very near zero to almost infinity) or not? I want the thermal radiation of normal things like hot Tungsten (wolfram) or hot Iron. I don't want the black body radiation of a star.

I think, theoretically it must contain all the wavelengths. But in a diagram in internet, it said the thermal radiation have wavelengths between 0.1 to 100 μm range. I think it should at least have very few amount of X-ray and gamma ray theoretically. (maybe it isn't measurable) Am I right? Note that I know in real world, We can say it almost have no X-ray or gamma ray. I want It theoretically.

 

[hilbert2]

The wavelength density distribution of Planck radiation is a continuum distribution which is nonzero at any wavelength, but as radiation has to be emitted in quanta (photons), it's very unlikely that you'll detect even a single photon with gamma-ray wavelength emitted from ordinary objects.