1. Radioactive Decay
Atoms emit high energy
particles and waves as they change into new less
2. Nuclear Fission
Atomic nuclei with large mass
numbers split into isotopes with smaller mass
numbers and release energy.
3. Nuclear Fusion
Two atoms usually hydrogen
fuse together to produce one helium atom and
Unstable isotopes called radioisotopes
release have energy particles and waves as
they decay into more stable isotopes over
This time is called a Half
the amount of
time it takes for one
half of the radioisotope
fast moving, positively
charged, made of 2 protons and 2 neutrons
fast moving, negatively
charged, made of electrons.
high energy electromagnetic
radiation. The most common and most
dangerous type of ionizing radiation.
First Law of
Energy is neither
destroyed , but may
Second Law of
changes form, some
energy is always
degraded into lower
energy and matter go in, waste is produced,
and low quality energy and matter come out.
Matter Recycling Economy
Saves matter and
energy, however, matter and energy still
and energy flow, is more sustainable because
of less waste.