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Energy in the Sun is produced primarily by


The mass of the nucleus is closest to

99% of that in the entire atom

Radioactivity in the Earth leads to

all of the above (energy for volcanoes, helium for toy balloons, heat for geysers)

LD50 refers to

lethal dose

A major reason that your body is radioactive is that

you eat radioactive carbon in your food

The primary cause of death from the Hiroshima bomb was

the blast from the bomb

Fission fragments are

among the most dangerous kind of radiation

Wine made from fossil fuels is not radioactive because


If the half-life of an element is big, that means that

it decays slower then one with a small half life

Muller wears a wrist watch with tritium in the watch hands because

the levels of radiation that emerge are safe

After three half-lives, the fraction of nuclei remaining is


Most of the elements found on the Earth were created

in the first few millions years of the Earths existence

The fraction of the US population that dies from cancer is typically

about 1 in 5

Watch dials containing radium glow because

the radiation hits a phosphor

Choose all the items that derive from radioactivity

helium for children's balloons / volcanic lava

After four half-lives, the surviving tritium atoms are removed. Compared to completely new tritium atom, they are expected to live

exactly as long

One rem of radiation dose takes how many gammas


Which requires the larger dose


The linear hypothesis is

widely used even though it is not proven

A sievert is how many rem

100 rem

Cancer is lower in Denver because

we dont know why

The number of deaths from the Chernobyl accident is about


radioactivity is used in

smoke detectors

Neutron activation is used

to search for rare atoms

Dirty bombs may be less of a threat than people fear, because

dirty bombs require plutonium, and that is hard for terrorists to obtain

Radioactivity in the Earth is responsible for

helium we use in balloons

Volcanic heat comes from

fusion deep in the earth

The best way to measure the age of an ancient bone is

radiocarbon dating

An RTG is

carried in satellites for power

Uranium is found on the Earth, even though it is radioactive. Thats because

it has a very long half-life

Carbon-14, compared to carbon-12

has more protons

Alexander Litvinenko was assassinated with


The radiation from cell phones

does not cause cancer

The threshold for radiation illness is about

100 rem

The natural radioactivity (rate of nuclear decays) in a typical human body is closest to

4000 per second

The source of energy in the Sun is

fusion of hydrogen

Which of the following is most toxic per gram


The radioactivity from your own body

does cause cancer, but at a very low rate

Drinking alcohol is required to be radioactive because

it shows that the alcohol was "aged"

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