Hello BarbieW.I believe "MeV" is actually transcribed as the abbreviation for "millivolt" which is "mV" (lowercase "m" with uppercase "V") and should be used in both examples you cited.
My source is our
Medword.com Online Medical Dictionary page found here (once there, click on "mV" found in the body of the page):
Medword Online Medical Dictionary: Alphabet Range: Musset-myelof As for "irradiation" versus "radiation" I believe they are interchangeable in their form as a noun. It is probably just the preference of the dictator. Here are some good definitions of each that I found:
Noun: irradiation1. The condition of being exposed to radiation
2. A column of light (as from a beacon)
3. (physiology) the spread of sensory neural impulses in the cortex
4. The apparent enlargement of a bright object when viewed against a dark background
5. (Pavlovian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus
6. (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance
Noun: radiation1. Energy that is radiated or transmitted in the form of rays or waves or particles
2. The act of spreading outward from a central source
3. Syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses cause diarrhoea and nausea and vomiting and sometimes loss of hair; greater exposure can cause sterility and cataracts and some forms of cancer and other diseases; severe exposure can cause death within hours
4. The spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
5. The spread of a group of organisms into new habitats
6. A radial arrangement of nerve fibers connecting different parts of the brain
7. (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance
Hope this helps.
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