atomic structure/radioactivity

Cards (16)

acitivty
the amount of radiation emitted from a material
alpha radiatiom
least penetrating
most ionising
helium nucleus
beta radiation
more penetrating than alpha less than gamma
high speed electron
count rate
number of counts per second detected by a geiger counter
half life
time taken for half of the nuclei in a substance to decay
ion
atoms with a charge caused by losing or gaining electrons
isotope
same proton different neutron
james chadwick
scientist who proved there were neutrons in the nucleus
neils bohr
scientist who theorised electrons are in fixed orbit around the nucleus
nuclear fission
one nucleus breaks apart to form two smaller nuclei when it absorbs a neutron
nuclear fusion
two smaller nuclei forming one large nucleus
plum pudding model
a ball of positive charge with negative electrons scattered throughout
radioactive tracer
radioactive substance with a short half life that can be ingested safely for medical purposes
nuclear model
electtrons orbit around a central nucleus
replace the plum pudding model
contamination
having a radioactive material inside the body or having it on skin/clothes
becquerel (Bq)
unit of radiation