Studied by 7 people
Isotope
Element variation
What varies in isotopes?
Neutrons
Unstable nuclei
An atomic nucleus with uneven numbers of protons and neutrons
Decay
The process of stabilizing a nucleus by emitting radiation
What does alpha decay emit?
A helium nucleus
2 protons and 2 Neutrons
What does beta decay emit?
electron
Negative beta decay
Neutron turn proton and emits negative electron
Positive beta decay
Proton turns neutron and emits positive positron
What does gamma decay emit?
pure energy
What is most dangerous internally? Gamma, Alpha, or Beta
Alpha
What is most dangerous externally?
Gamma
Which has longest range?
Gamma
Which has shortest range?
Alpha
What element was Litvinenko poisoned by?
Polonium
How did Poloium kill him?
trough alpha radiation damaging his internal organs
How dangerous is polonium
most dangerous element known
What is half life?
the time it takes for an element to decay to half of its original value
Background radiation
natural ionizing radiation
types of background radiation
cosmic and radon gas
What radiation are Norwegians most exposed to?
Radon
Hormesis
low doses of radiation are beneficial big doses are dangerous
Types of ionizing radiation in medicine
X-ray, PET, MRI, ultrasound
how do x ray work?
outer radiation, x-rays are absorbed by heavy atomic nuclei
Gamma radiation in medicine
source injected into body, gamma cameras outside
What is Bq
Bequerel
What is Gy
Grey
What is Sv
Sievert
What is J
Joule
What does bq meausure
radiation per second/s
What does Sv meausre
health risk from radiation
How much energy is ionizing
more than 10eV
Note 
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