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At a typical environmental background temperature, which is around 300 K, the peak emission is at about 9.7 μm (and the curve covers the FIR region as well) at around 1800 K (temperature of molten steel), the peak is shifted to 1.6 μm at around 6000 K (surface temperature of the sun), the peak is shifting even further, 0.48 μm, which now is in the visible (blue) region of the spectrum.
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For instance, at room temperature most of the emission of the black body is in the infrared region of the electromagnetic spectrum. In this type of spectrum, spectral peaks at characteristic frequencies are shifted to higher values (shorter wavelengths) with increasing temperature values. This is a type of radiation and has continuous frequency/intensity which depends only on the black body’s temperature, and the type of spectrum it generates is called the Planck spectrum. When a black body is at a uniform temperature state, it emits back this absorbed energy, and it is termed as “ black body radiation ”. In essence, all matter absorbs electromagnetic radiation to some degree and an object that absorbs all radiation falling on it (at all wavelengths and frequencies) is called a black body, i.e., a perfect absorber.
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The term “black body” was first used by Gustav Kirchoff in 1860. Not only is FIR absorbed by the human body but it is also emitted by the body in the form of black body radiation (3–50 μm with an output peak at 9.4 μm).
#Radiant health saunas skin#
In the IR radiation bands, only FIR transfers energy purely in the form of heat which can be perceived by the thermoreceptors in human skin as radiant heat. We cover both traditional applications and novel applications, and survey the latest technological advancements and most recent scientific studies in the field. In this paper we explore the use of FIR as a promising treatment modality for certain medical conditions. Nowadays, specialty FIR emitting heat lamps and garments made up of filaments (fibers) impregnated with FIR emitting nanoparticles are becoming used to deliver these thermal radiation effects. With the development of better technology to deliver pure far infrared radiation (FIR), the benefits from its effects have widened. Heated saunas are only one of the avenues (and perhaps the oldest) to deliver the radiation in a controlled environment and within a convenient treatment time. Thermal radiation (or infrared) is a band of energy in the complete electromagnetic spectrum and it has been used effectively for millennia to treat/ease certain maladies and discomforts. Living organisms experience the beneficial as well as adverse effects of it at all levels, starting from sub-cellular organelles and ending with the whole body. All living organisms are subjected to the natural electromagnetic radiation reaching the earth from the sun.