The other type doesn't use X-rays but instead a technology called millimeter-wave scanning.

另外一种不使用X射线，而是采用了一种叫做毫米波扫描的技术。

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Light is an electromagnetic wave, with a longer wavelength than X-rays and ultraviolet, and a shorter wavelength than infra-red, microwaves and radio waves.

光是一种电磁波，其波长长于X光和紫外线，短于红外线、微波和无线电波。

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“We still teach students analog X-ray techniques, but the emphasis is on digital radiography,” clinic director Herbert said. “This is the wave of the future.”

“我们也会教学生使用模拟X光技术，但教学重点是数字放射显影术，”诊所主任赫伯特说。“未来化趋势不可阻挡。”

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The highest probability now is going to be along the x-axis, so that means we're going to have a positive wave function every place where x is positive.

概率最高的地方是沿着ｘ轴，这意味着只要在ｘ,大于零的地方波函数都是正的。

麻省理工公开课 - 化学原理课程节选

But for now let's simply say that we have a diffraction which we know occurs only by wave-like behavior and it involves the use of x-rays. Why x-rays?

但现在让我们来简单假设一下,我们知道,只波才发生衍射,而且衍射涉及了X光的使用，为什么是X光？

麻省理工公开课 - 固态化学导论课程节选

Backscatter machines use X-rays, while millimeter wave machines use radio waves.

CNN: TSA removing 'virtual strip search' body scanners

In the U.S., the TSA uses both types of scanners: 250 X-ray scanners and 264 millimeter wave scanners.

FORBES: Europe Bans Airport Body Scanners For "Health and Safety" Concerns

Instead of X-ray scanners, European airports will use millimeter-wave scanners that utilize low-energy radio waves.

FORBES: Europe Bans Airport Body Scanners For "Health and Safety" Concerns