But when feet feel cold but are not cold to the touch, a possible cause is a neurologic problem, such as peripheral neuropathy. Of course, feet can get cold for many reasons. The most obvious is a cold environment, along with a lack of proper shoes or socks.
X-RAY PHOTON. A brief definition of an x-ray photon was previously stated. However, a more comprehensive definition is necessary for the next series of photon actions. X-ray photons are electromagnetic rays produced in the x-ray tube head when electrons from the cathode filament strike the anode target. They are bundles of pure energy. The photons transfer their energy to the substance through which they pass whether it be air, an x-ray film, or the living tissue of the patient or the specialist. They cannot be seen or felt. a. Photon Action Upon Atoms. (1) Photon collision with the nucleus of an atom. The photon may strike the nucleus of an atom.
The x-ray source-to-object distance refers to the distance between the focal spot and the object to be recorded. The use of a long open-ended position indicating device (PID or cone) will enable the x-ray photons to emerge in a straighter line therefore producing a more dimensionally accurate image.rinciple One: X-rays Should be Emitted from the Smallest Source of Radiation as Possible. As electrons strike the focal spot, x-rays are emitted. The smaller the focal spot is inside the x-ray tubehead, the greater the detail or resolution of the resultant image.