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RADIATION 101, RA-Di-a-tion the word and intent

Have been looking at how radiation is presented, and explained in recent centuries. What is ra-diation? How do we interact with “it.” And it with us. Also the types and spectrums of radiation. Came upon picture-book version for recent history, with nicely done primer images:
Radiation 101-
“A short lesson in how radiation enters the human body, compliments of the Atomic Testing Museum in Las Vegas, Nevada. These images are from a booklet on nuclear testing on Bikini Atoll…” Thanks to http://www.IodineHistory.blogspot.com for pulling together the images. http://iodinehistory.blogspot.com/2013/02/radiation-101.html

RA-DIATION: ra·di·a·tion:
1.PHYSICS: the emission of energy as electromagnetic waves or as moving subatomic particles, esp. high-energy particles that cause ionization.
the energy transmitted by radiation, as heat, light, electricity, etc.
plural noun: radiations.
RA-DIATE: ra.di.ate:
verb: 1. emit (energy, esp. light or heat) in the form of rays or waves.
“the hot stars radiate energy”
synonyms: emit, give off, give out, discharge, diffuse; More
(of light, heat, or other energy) be emitted in the form of rays or waves.
“the continual stream of energy that radiates from the sun”
synonyms: shine, beam, emanate.
adjective: 1.having rays or parts proceeding from a center; arranged in or having a radial pattern.
“the radiate crown”
Origin early 17th cent.: from L
radiation (n.)
mid-15c., “act or process of radiating,” from Middle French radiation and directly from Latin radiationem (nominative radiatio) “a shining, radiation,” noun of action from past participle stem of radiare “to beam, shine, gleam; make beaming,” from radius “beam of light; spoke of a wheel” (see radius). Meaning “rays or beams emitted” is from 1560s. Meaning “divergence from a center” is 1650s.