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Their method was to add radon to the substance to be examined.
There are some other properties of the substance to be considered at this point.
There are some other compounds to be mentioned.
Alpa-radiation was the first radiation to be studied in detail.
The first trans-uranium element to be made was a neptunium isotope Np233.
Helium which was the last gas to be liquified, freezes at about - 272 °C.
Polonium was the first of the radioactive elements to be isolated by the chemists.
These rays are just the ones to be easily detected.
Here are some more figures to be referred to later.