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    Upon marrying Steenburgen, Danson became the stepfather to Steenburgen's daughter Lilly and son Charles.

    Carbon radioisotope dating

    The radiation is invisible and not directly detectable by human senses; as a result, instruments such as Geiger counters are usually required to detect its presence.In some cases, it may lead to secondary emission of visible light upon its interaction with matter, as in the case of Cherenkov radiation and radio-luminescence.

    Note caveats in the text about this simplified diagram.The lower-energy, longer-wavelength part of the spectrum including visible light, infrared light, microwaves, and radio waves is non-ionizing; its main effect when interacting with tissue is heating.This type of radiation only damages cells if the intensity is high enough to cause excessive heating.Ionizing UV therefore does not penetrate Earth's atmosphere to a significant degree, and is sometimes referred to as vacuum ultraviolet.Although present in space, this part of the UV spectrum is not of biological importance, because it does not reach living organisms on Earth.

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