2) Migratory species like Pacific bluefin and albacore tuna traveled from Japan to the U.S. West Coast, carrying small amounts of radioactive elements

3) Tests found radiation in tuna, but the levels were far below anything considered harmful to humans

- Ionizing radiation = Have alot of energy enough to create an ion or unbalance atoms that can change living cells or cause mutations

- Half-life= rate at which a radionuclide decays to half it''s original atoms

- Radioactive decay= process in which radionuclides release energy

Two Types of Radiation ----->

Ionizing radiation- so much energy, knock electrons out of atoms, can change living cells and cause mutations

Non-Ionization Radiation - does not have enough energy to cause ionization (Does not have enough energy to cause ionization

Ex. Radio waves, microwaves, visible light

Human Made Sources: Mining, Power Generation, Nuclear Medicine, Military Applications, Consumer Products.

Radioactive materials that release energy in the form of ionizing radiation may cause damage to living cells by changing the state of atoms inside genetic material, in turn causing mutations to DNA.

-Radiocecium isotopes help indicate if they recently migrated from Japan.

-Radiation can knock electrons and change DNA in humans, but depends on exposure, size, life of the particle, etc.

- Many exposed marine organisms remain around Japan

Two Types of Radiation

• Ionizing radiation: has so much energy

• Non-ionizing radiation: does not have enough energy

- Radioactive materials impact humans this is because of the radiation that depends on the exposure, either chronic(long period of time) or acute (short-term)

- Radiation exposure has always been a natural part of our environment, with sources in the soil, water, and air.

-these species are highly migratory

-small bluefin has 134Cs and large fish had 137 Cs

-radiation exposure comes from human made sources

2) Many of the exposed marine organisms migrated and swim across the North Pacific to the West.

3) For public health the levels of radiation are very low and far below levels that are considered cause for concern.

4) Radiation is energy in the form of waves or energized particles.

2) Non-Ionizing Radiation - Not enough energy to cause ionization, harms from radiation.

3) Tested on tuna or other fish.

4) Half Life - The rate at which a radionuclide decays to half its original atoms and is measured as time, ranging from mere seconds - millions of years.