It may be that all matter is radio-active, or can be made so.
Braced tunnels were here, penetrating back and downward into this vein of radio-active rock.
Polter said so once, a radio-active drug; I remember listening at the door.
Admitting that radio-active bodies can be manufactured to order, are we any nearer explaining their mysterious powers?
In what corner of the globe will be found the cheap and convenient supply of the raw material yielding the radio-active bodies?
The property has been attributed to the presence of uranium, one of the most radio-active among the known metals.
But he is also considered the West's most advanced student of electrical and radio-active subjects.
In radio-active bodies certain atoms seem to be undergoing disintegration.
The question is whether these "radio-active" elements are undergoing disintegration, or formation, in the sun.
In the discovery of radio-active elements, a new property of matter was discovered.