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On the periodic table, gold is 79Au197 . Which is the A #, which is the Z #?
197 is the A#. which is the mass #, it includes all protons and neutrons.
79 is the Z#. which is the Atomic #, it is the number of protons in the nucleus.
Using gold again with a Z# of 79, and an A# of 197, how many neutrons are in the gold nucleus?
118. The A# is the total protons and neutrons. The Z# is protons only. Subtract Z from A to get # of neutrons.
Equivalent dose, ( EqD ) and Effective dose ( EfD ) are measured in what? Name the SI and Traditional units.
- Traditional unit is Rem's.
- Si unit's are Sieverts (Sv)
How many millisieverts makes 1 Sievert?
1,000. and a millisievert is 1/1000 of a Sievert.
List the 3 radiation measuring units of the SI system.
- Gray (absorbed dose)
- Sievert (EfD and EqD)
- Becquerel (radioactivity)
List the traditional units of radiation measurement.
- Rad (absorbed dose)
- Rem (EfD and EqD)
- Curie (radioactivity)
All Ionizing Radiation has weighting factors. (WR) X-rays and Gamma rays have a weighting factor of ___?
Alpha particles have a weighting factor of ___?
- X-rays and Gamma rays are 1.
- Alpha particles are 20.
See table 3-2
True or False. The higher the weighting factor of an ionizing radiation, the more chance it has of ionizing tissue.
True or False. When a particle is emitted from the nucleus, an electromagnetic radiation occurs in the form of a gamma photon.
The most important purpose of added filtration is____?
Reduce Patient Dose
In diagnostic x-ray, the higher the energy of the photon, the more chance of a compton interaction. What interaction on matter would low energy photons mostly have?
Photoelectric effect. (low energy photons are most likely to be absorbed)
What interaction usually happens when an x-ray photon interacts with an outer shell electron.
The Z # is the amount of ______ which uniquely identifies each element.
During beta emission an atom releases an__________?
Alpha particles are made of 2 protons and 2 neutrons. Which is better known as a ________?
Helium ion. (He)
Which dose measurement takes into consideration the biological damage caused by radiation.
1) Maximum permissible dose
2) Absorbed dose
3) Background Equivalent dose
True or False. A compton scattered electron will be absorbed close to the site of interaction.
A positron has the same mass as an _____?
100 ergs per gram is equivalent to how many Rad's.
LET is Linear Energy Transfer, it is expressed in units of _________?
In the 1950's what replaced Tolerance dose for radiation protection purposes
Maximum permissible dose (MPD)
The creation of 2 photons of .51 mEv each is the result of _____?
True or False. X-rays are low LET.
True. X-rays are LOW LET !!!
Curies are a large measurement and Becquerels are a small measurement.
What do they measure and how many Becquerels are in 1 Curie?
Look it up. :)
Kerma, probably should study that.
What would you like to do?
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