Chapter 6 Principles of Radiologic Physics and Dosimetry Flashcards Preview

Perez and Brady's Principles and Practice of Radiation Oncology 6th Edition > Chapter 6 Principles of Radiologic Physics and Dosimetry > Flashcards

Flashcards in Chapter 6 Principles of Radiologic Physics and Dosimetry Deck (15):
1

Dimension of atom

10(power -10) m

2

Dimension of nucleus

10(power -14) m

3

Rest mass of an electron(me)
negative electric charge of an electron

9.109 x 10(-31) kg
1.602 x 10(-19) coulomb

4

Density of nucleus

10(power 15) kg/m3

5

Nucleons composed of?

Protons + Neutrons

6

Rest mass of Proton (mp)
Positive electric charge of Proton

1.673 x 10(-27) kg
1.602 x 10(-19) Coulomb

7

Rest mass of Neutron(mn)
Electric charge of Neutron

1.675 x 10(-27) kg
No electrical charge

8

Units of atom for
Mass
Distance
Energy
Electrical charge

amu (Atomic Mass Unit)
nm (NanoMeter) 1nm = 10(-9) m
eV (electron Volt)
e (electronic charge) 1 e = 1.602 x 10(-19) C

9

Define Atomic Mass Unit

1/12 the mass of the neutral carbon-12 atom

10

Conversion of amu to kg

1 amu = 1.660 x 10(-27) kg

11

Define electron volt(eV)

Kinetic energy required by an electron accelerated through potential difference(voltage) of 1 volt(V)

1 eV = 1.6 x 10(-19) joule(J) of energy

12

Maximum number of electrons allowed in each shell is given by

2n(power 2)

13

Atomic number(Z) equals to
Atomic mass number(A) equals to

Z equals to number of protons(P) in the nucleus
A equals to number of nucleons(P+N)

14

What is the atomic number(Z) and atomic mass number(A) of cobalt

Z = 27(P)
A = 60(27P + 33N)

15

Define Isobar and Isotone and Isotope

Isobar has same mass number but different proton and neutron numbers eg 60/27 Co and 60/28 Ni

Isotones has same number of neutrons but different atomic and mass numbers eg 57/27 Co and 56/26 Fe

Isotopes have same atomic number but different number of neutron and therefore different mass number eg 58/27 Co 59/27 Co 60/27 Co