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Keywords: radiation, half-life, proton, neutron, electron, isotope, alpha, beta, gamma
Structure of the atom Nuclear radiation Thickness control half life
years
deflected in
magnetic and electric fields
helium nucleus
deflected in
PROTON ­ positive, same magnetic and electric fields
mass as neutron ("1") electron
NEUTRON ­
neutral, same ELECTRON ­ negative, mass
mass as proton nearly nothing Not deflected
("1") e.m. wave
Beta radiation
Half ­ life
Time it takes for number of radioactive nuclei/count
rate to fall to half its initial value Tracers half life hours
200
A
ct
iv
it 100
y
5 1
Half lives T 2 3 4 Time
T T 0 T (s)
Isotopes Gamma radiation
Penetrating power
Smoke Alarms ­ half life years
In air :
- 5cm
- 1m
- km
Ionising power
Smoke
Alpha ­ very
detectors
Alpha radiation
Gamma - weakly
Keywords: ionising, penetration, range, tracer…read more

Comments

Anisa -Team GR

AMAZING

Saloni Shah

great

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