41. Each impact of an alpha particle on the screen produced a tiny flash of light. 42. This is particularly important with alpha particles which are easily stopped by a small mass. 43. Beta particles are electrons or positrons and can travel farther than alpha particles in air. 44. Ernest Rutherford discovered the alpha particle and also developed the nuclear theory of atomic structure. 45. Alpha particles emitted by polonium ionize air molecules that neutralize charges on the nearby surfaces.46. The alpha particles reheat the plasma while the energy of the neutrons can be extracted. 47. Polonium is dangerous both as an alpha particle emitter and because it is chemically toxic. 48. Other nuclei, such as alpha particles , are less prevalent. 49. It radiates a low level dose of alpha particles . 50. Then, three detectors will measure whatever sputters off _ reflected alpha particles , or protons, or x-rays.
