Only barium and radium remain.

Alright, then, radium wouldn't be separated from barium.

All that was now left was to separate these two survivors barium and radium.

This was the problem to separate barium and radium somehow or other.

From this few ounces, radium their precious element was eventually to be isolated.

21. More densely ionizing (high LET) radiation exposures result from alpha particle emitting radionuclides, such as radon and its decay products and radium and thorium used in medical and industrial applications.

By far the largest source of exposure is the sum of natural sources. The whole world population is exposed to cosmic rays and radiation from naturally occurring radioisotopes of potassium, uranium, radium, radon, thorium etc. in soil, water, food and the body.

24. Long lived radium 226 and radium 228 at high levels have caused bone sarcomas and carcinomas of the paranasal sinuses in radium dial painters, and the risk extends over the long periods in which these radionuclides are lodged in bone.