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- Grenz rays are part of the electromagnetic spectrum comprising low energy (ultrasoft) X-rays. These were first investigated by Gustav Bucky in 1923 using a cathode vacuum tube with a lithium borate glass window, which he labeled Grenz rays as he believed that the biological effects resembled those of UV light and traditional X-rays and hence were on the border between the two (Grenz = border in German). These rays are also known as Bucky rays. Grenz rays are produced by specially calibrated X-ray machines generally operating in the 10 to 30 kV range to produce X-rays with HVL less than 0.035 mm in aluminum. (HVL is half-value layer, and refers to a thickness of a given material that will cut the X-ray flux by 50%). Grenz rays are absorbed by air and therefore treatments must be given at fixed distances for which the machine has been calibrated. In human tissue Grenz rays have a half-value depth of 0.5 mm and are essentially absorbed within the first 2 mm of skin. The exact mechanism of action is unknown but it does have effects on the Langerhans cells in the epidermis. (en)
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- Grenz rays are part of the electromagnetic spectrum comprising low energy (ultrasoft) X-rays. These were first investigated by Gustav Bucky in 1923 using a cathode vacuum tube with a lithium borate glass window, which he labeled Grenz rays as he believed that the biological effects resembled those of UV light and traditional X-rays and hence were on the border between the two (Grenz = border in German). These rays are also known as Bucky rays. (en)
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