PHYS 1010 Lecture Notes - Lecture 25: Scintillation Counter, Geiger Counter, Beta Particle
An energetic beam of electrons striking a solid surface excites the innermost electrons of the atoms of the target and produces higher frequency photons of x- radiation. X-ray photons have high energy and can penetrate many layers of atoms before being absorbed or scattered. Do this when they pass through your soft tissue to produce an image of the bones inside your body. Radioactivity: time zero the process of nuclear decay. Nothing new in the environment; it"s been going on since the beginning of time. Warms earth"s interior is in the air we breathe is present in all rocks is natural. Radioactive elements emit three distinct types of radiation: Lethal doses of radiation begin at 500 rems. The atomic nucleus and the strong force: the strong force holds nucleons together. Geiger counter detects incoming radiation by a short pulse of current triggered when radiation ionizes a gas in the tube.