safety
what is the SI unit of Absorbed dose?
Gray (Gy)
What is the SI unit of exposure?
Coulomb/kilogram
amount of radiation energy transferred to air
What is a Threshold dose-response relationship?
some amount of radiation is required before a measurable effect can be detected
What is a Sigmoidal variation, in regard to dose-response curves?
S-shaped, constantly varying slope.
What does Absorbed dose (Gy) determine?
the amount of energy from the x-ray beam that is transferred to the absorbing object
What does exposure Coulombs/kilogram (C/kg) measure?
unit of radiation exposure that will yield 2.58 x 108 coulombs per kilogram in air.
What is:
study of methods of interaction and the effects of ionizing radiation on living systems.
Radiobiology.
What is a Linear variation in regard to dose response curves?
the response is directly proportional to the dose.
what does the law of Bergoine and Tribondeau state about radiosensitivity?
cell radiosensitivity is affected by mitotic activity, maturity, and degree of specialization.
1 Gray (Gy) equals ______ Rad?
100 Rad
How can Coulomb/kilogram (C/kg) also be expressed?
1. mGya
2. mGyt
3. absorption
when talking about Radiosensitivity:
If you are most sensitive, you are also _______?
the least resistant.
what happens if the radiation dose is doubled in a linear variation dose response?
the response is also doubled.
how does mitotic activity effect radiosensitivity?
radiosensitivity increases with increased mitotic activity
What is the SI unit of Dose Equivalent?
Sievert (Sv)
What is the SI unit for Effective dose?
Sievert (Sv)
What is a Non-threshold dose-response relationship?
any does of radiation will yield some measurable effect.
what is a Curvilinear (non-linear) variation, in regard to dose response curves?
1. at some point the slope of the dose response curves.
2. the response if not directly proportional to the dose.
how does maturity of the cell affect radiosensitivity?
radiosensitivity decreases with increased maturity.
1 Sievert (Sv) equals _______ Rem?
100 Rem.
What is the SI unit for Air Kerma?
Gray (Gy)
Is there a safe dose in a Non0threshold dos-response relationship?
no, no dose is considered safe
what happens if a radiation dose is doubled in a non-linear response?
the response does not double
Which cells are more radiosensitive: stem cells or nerve cells?
1.stems cells are less mature, and more radiosensitive. 2.nerve cells are more mature, and less radiosensitive.