radium emanation

American  

noun

Chemistry.

1. (formerly) radon.

---

Etymology

Origin of radium emanation

First recorded in 1900–05

Example Sentences

See Examples For:

radium emanation

Contact with radium emanation results in a deposit of the fatal radium-D, which in 40 years is but half removed.

From Darwin and Modern Science by Seward, A. C. (Albert Charles)

This radium emanation is dissolved in the soil waters, wells, springs, and rivers, rendering them more or less radio-active, and sometimes the muddy deposit at the bottom of a spring shows decided radio-activity.

From A Brief Account of Radio-activity by Venable, Francis Preston

These are generally known as radium emanation, thorium emanation, and actinium emanation.

From A Brief Account of Radio-activity by Venable, Francis Preston

In addition, the spectral lines of uranium, radium, and the radium emanation have been reported as being found in the sun's spectrum and also in the new star, Nova Geminorum 2.

From A Brief Account of Radio-activity by Venable, Francis Preston

The radium emanation is a gas about 111 times heavier than hydrogen; to this gas Sir William Ramsay has given the name niton.

From The Story of Alchemy and the Beginnings of Chemistry by Muir, M. M. Pattison