Nucleons are either protons or neutrons and the total number of nucleons is given the symbol A (also known as the mass number). The total number of protons within the nucleus is called the atomic number and given the symbol Z. It is the total number of protons within the nucleus.
1 Excitation and ionisation. 2  X-Rays produce excitation and ionisation of the atoms and molecule of the substances through which they pass. 3  Excitation is the process of raising an electron to a higher energy level. 4  Ionisation is the process in which an electron is completely removed from an atom. 5  Biological effect.  The measurement of the effective atomic number of a piece of material in vivo can be achieved using computed tomography. The precision of measurement of this parameter depends on the precision of measurement of the X-ray absorption coefficient at two energies and the separation of these energies. With the assumption of a fixed photon flux, it is shown that two optimum energies exist for the measurement of effective atomic number. A new method is introduced in which the total photon interaction cross sections per electron of human tissues are used to define effective atomic numbers for blood, bone, brain, fat, heart, kidney, liver, lung, muscle, ovary, pancreas, spleen, and water. Effective atomic numbers for low-energy total photon interactions in human tissues. Yang NC(1), Leichner PK, Hawkins WG. Author information: (1)Johns Hopkins Hospital, Department of Radiation Oncology, Baltimore, Maryland 21205. Radiologists use a variety of imaging techniques such as X-ray radiography, ultrasound, computed tomography (CT), nuclear medicine including positron emission tomography (PET), and magnetic resonance imaging (MRI) to diagnose and/or treat diseases. The acquisition of medical imaging is usually carried out by the radiographer, often known as a radiologic technologist. Depending on location, the diagnostic radiologist, or reporting radiographer, then interprets or reads the images and produces a report of their findings and impression or diagnosis. Interventional radiology is the performance of (usually minimally invasive) medical procedures with the guidance of imaging technologies. The acquisition of medical imaging is usually carried out by the radiographer, often known as a radiologic technologist. Depending on location, the diagnostic radiologist, or reporting radiographer, then interprets or reads the images and produces a report of their findings and impression or diagnosis. Nucleons are either protons or neutrons and the total number of nucleons is given the symbol A (also known as the mass number). The total number of protons within the nucleus is called the atomic number and given the symbol Z. Protons and neutrons have a mass of 1, protons are positively charged and neutrons have no charge. 1  A (mass number): total number of nucleons = protons + neutrons. 2  Z (atomic number): number of protons. A great many different configurations of the nucleus may occur. In each case, the atomic number defines the element, i.e. it is the number of protons that determines that carbon (having 6 protons) is carbon. Plain radiography was the only imaging modality available during the first 50 years of radiology. Due to its availability, speed, and lower costs compared to other modalities, radiography is often the first-line test of choice in radiologic diagnosis. The acquisition of medical imaging is usually carried out by the radiographer, often known as a radiologic technologist. Depending on location, the diagnostic radiologist, or reporting radiographer, then interprets or reads the images and produces a report of their findings and impression or The number of protons in the nucleus of an atom determines an element's atomic number. In other words, each element has a unique number that identifies how many protons are in one atom of that element. For example, all hydrogen atoms, and only hydrogen atoms, contain one proton and have an atomic number of 1. All carbon atoms, and only carbon atoms, contain six protons and have an atomic number of 6. Oxygen atoms contain 8 protons and have an atomic number of 8. The atomic number of an element never changes, meaning that the number of protons in the nucleus of every atom in an element is always the same UK radiology registrars are represented by the Society of Radiologists in Training (SRT), which was founded in 1993 under the auspices of the Royal College of Radiologists. The society is a nonprofit organisation, run by radiology registrars specifically to promote radiology training and education in the UK. The acquisition of medical imaging is usually carried out by the radiographer, often known as a radiologic technologist. Depending on location, the diagnostic radiologist, or reporting radiographer, then interprets or reads the images and produces a report of their findings and impression or diagnosis.
http://www.priory.com/vet/physint.htm http://link.springer.com/article/10.1007%2FBF00327254 http://www.ncbi.nlm.nih.gov/pubmed/3683305 https://en.wikipedia.org/wiki/Radiology https://en.wikipedia.org/wiki/Radiology http://radiopaedia.org/articles/structure-of-the-atom https://en.wikipedia.org/wiki/Radiology https://www.nde-ed.org/EducationResources/HighSchool/Radiography/atomicmassnumber.htm https://en.wikipedia.org/wiki/Radiology
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