Raphex

Question 1

Isomer

Answer 1

Metastable nucleus

Question 2

Isobar

Answer 2

Same amount of nucleons

Question 3

Isotone

Answer 3

same amount of neutrons

Question 4

Isotope

Answer 4

same amount of protons

Question 5

wavelength of xray

Answer 5

e=hc/L

Question 6

Directly ionizing radiation is caused by

Answer 6

CHARGED particles (not neutrons of photons)

Question 7

temperature korrection

Answer 7

(temp in kelvin)/(reference temp in kelvin)

Question 8

Pressure korrection

Answer 8

(Reference pressure)/(pressure)

Question 9

define rtg

Answer 9

1rtg=0.873cGy in air. different dose for rest of the materials. depend on compound of the material and the x-ray spectrum.

Question 10

whats optical density?

Answer 10

log[(incident light intensity)/(transmitted light intensity)]

Question 11

what is transient equilibrium

Answer 11

Transient equilibrium is a situation in which equilibrium is reached by a parent-daughter radioactive isotope pair where the half-life of the daughter is shorter than the half-life of the parent. EX generators

Question 12

Secular Equilibrium

Answer 12

Secular equilibrium can only occur in a radioactive decay chain if the half-life of the daughter radionuclide B is much shorter than the half-life of the parent radionuclide A. In such a situation, the decay rate of A, and hence the production rate of B, is approximately constant but B is slightly larger,

Question 13

beta -

Answer 13

n=>p + e+ antineurino

Question 14

beta +

Answer 14

p=>n + positron + neutrino

Question 15

EC

Answer 15

p+e=n+ neutrino

Question 16

why EC and not beta+

Answer 16

In proton-rich nuclei where the energy difference between initial and final states is less than 2mec2, β+ decay is not energetically possible, and electron capture is the sole decay mode.[3]

Question 17

HVL

Answer 17

half value layer. HVL=ln(2)/u

Question 18

what is specificity

Answer 18

TN/(TN+FP)

Question 19

what is Sensitivity

Answer 19

TP/(TP+FN)

Question 20

HU calculation

Answer 20

1000 x (u_water-u_material) /u_water