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eitc quiz 678
exact quiz 678
35
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Undergraduate 1
10/10/2016

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Term
which part of the cell acts as the "power plant" and supplies energy to the cell
Definition
mitochondria
Term
which part of the cell contains digestive enzymesthat break down large molecules
Definition
lysosomes
Term
which part of the cell directs all celluar activity and contains heredity factors
Definition
Nucleus
Term
which part of the cell is least affected by large dose of radiation
Definition
cytoplasm
Term
according to bergonie and tribondeau the radiosensitivity of tissue is proportional to its reproductive capacity
Definition
directly
Term
what tends to increase a cells radiosensitivity
Definition
high division and high metabolic rate
Term
a cell or tissue is considered to be more radiosensitive if it
Definition
has a high division rate
Term
what is not a factor of radiosensitivity
Definition
relative size
Term
what is the most sensitive to radation
Definition
red bone marrow
Term
what is most radioresistant
Definition
bone
Term
which free radicle product is chemical poison to the cell
Definition
hydrogen peroxide
Term
an effect whose probability of occuring increases as the dose increases without threshold is called _______ effect
Definition
stochastic
Term
the ld 50/30 for humans is estimated to be between
Definition
300 and 500 rem
Term
what is the ld 50/30 concept
Definition
50% of a large exposed group will die within 30 days without medical treatment
Term
cancer is an example of a ________ effect
Definition
chronic
Term
what is not a characteristic effect of hematopoieticsyndrome
Definition
brian edema
Term
the C N S synndrome is produced by acute whole body exposures above _______ rem
Definition
5000
Term
doses as low as _______ rad have been shown to cause development changes during two to six week period of apregancy
Definition
25
Term
effects which occur in the exposed indivual are called _____ effects
Definition
somatic
Term
what is not a somatic effect
Definition
cancer in offspring
Term
the relationship between populations of nuetrons and protons and the stability of that nucleus is best described as
Definition
the higher z number of the atom the more neutrons are required thus a higher value for the neutron/proton ration in a stable nuclide
Term
gamma radiation is defined as
Definition
electromagnetic energy emmitted from the nucleus with no mass and no shape
Term
which of the following equations is standard notation denotes an alpha decay including the parent daughter and other products
Definition
aX*a+4Y+a
z z-2
Term
most fission products are unstable because
Definition
too many neutrons
Term
what term describes the activity of one gram of radioactive substance
Definition
specific activity
Term
the quanity exposure is defined as
Definition
the ionization produced by x and gamma radiation in air
Term
minimum photon energy required for pair production interaction to occur
Definition
1.02 mev
Term
what is a direct result of neutron capture
Definition
gamma emission
Term
what type of neutron scattering leads to the emission of gamma photon
Definition
inelastic
Term
what is the most effective moderator for fast neutrons
Definition
water
Term
a quality factor relates _____ to______
Definition
absorbed dose , dose equivalent
Term
the term specific ionization refers to the
Definition
number of ion pairs formed per unit path length
Term
what is a mechanismof energy transfer for alpha particles
Definition
excitation
Term
what mechanism of energy transfer for beta particles does not work
Definition
pair production
Term
Ionization of an electrically neutral atom results in
Definition
negative electron and a positive atom
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