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Electromagnetic Spectrum


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Here is a short introduction in layman’s terms on what is an Electromagnetic Spectrum.  A simple knowledge of this is important in the study of gemstones and gemology.

The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation.  Hence, the “Electromagnetic Spectrum” of an object is the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular object.

The electromagnetic spectrum extends from low frequencies used for modern radio to gamma radiation at the short-wavelength end, covering wavelengths from thousands of kilometers down to a fraction of the size of an atom.

In simple terms the following are the range of the Electromagnetic Spectrum:

Radio Waves:  This is the kind of energy that radio stations emit into the air to our radios.  There are also used for fixed and mobile radio communication, broadcasting, radar and other navigational systems, satellite communication, computer networks and other radio applications.

Microwaves: They will cook up your popcorns or reheat your food. Microwaves in space are used by astronomers to learn about the structure of nearby galaxies, and our own Milky Way!

InfraRed: Our skin emits infrared light, which is why we can be seen in the dark by someone using night vision goggles. In space, IR light maps the dust between stars.

Visible: This is the part that our eyes see.  Visible radiation is emitted by everything from fireflies to light bulbs to the stars above.

Ultraviolet: The sun is a source of ultraviolet (UV) radiation.  This UV rays can cause our skin to burn.  Stars in space also emit UV radiation.

X-Rays: Your doctor uses them to look at your bones.  Hot gases in the Universe also emit X-rays.

Gamma-Rays: Radioactive materials (some natural while others are made by man in the nuclear power plants) can emit gamma-rays.  Big particle accelerators that scientists use to help them understand what matter is made of can sometimes generate gamma-rays.

Ref : http://www.antonine-education.co.uk, http://imagine.gsfc.nasa.gov

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I am a Graduate Gemologist trained at the Gemological Institute of America (GIA) in New York City, USA. I hold an MBA degree from Cranfield University, United Kingdom, and a Bachelor degree in Mathematics. My earlier profession was a banker until I found jade in Myanmar (Burma) in the early 90s. I have traveled to the fabled Hpakan Jade mines, and Mogok, the world’s famous rubies and sapphires mines in upper Burma, with my second son. Three of my children are also Graduate Gemologist, GIA, NYC and they deal in diamonds, gemstones and jade. 我是在美国纽约市的美国宝石学院(GIA)接受过培训的宝石研究学家。 我拥有英国克兰菲尔德大学的工商管理硕士学位和数学学士学位。我以前的职业是银行家,直到90年代初我在缅甸接触到玉石。我曾经和我的次子一起去过缅甸上流传说中的哈帕翡翠矿山和莫谷矿山, 莫谷矿山是世界上著名的红宝石和蓝宝石矿山。我的三个孩子都是纽约市GIA毕业的宝石研究学家, 他们专门处理钻石,宝石和玉石.