31. The radioactive decay can be detected through an ionization chamber or autoradiographs of gels. 32. Alpha decay is much more easily shielded against than other forms of radioactive decay . 33. It is also possible that warmth from radioactive decay in the Earth warms it. 34. :The article on Volcanism doesn't say anything about radioactive decay . 35. The gold did contain radioactive decay products of 222 Rn. 36. It also is possible that warmth from radioactive decay in the Earth warms it. 37. The heat of radioactive decay comes mainly from the elements uranium, thorium and potassium. 38. The number of excited states N thus decays exponentially with time, similar to radioactive decay . 39. Polonium only occurs in trace amounts on earth, via radioactive decay of uranium and thorium. 40. Radon is formed as part of the normal radioactive decay chain of uranium and thorium.
