Radiation Biology

Question 1

Radiation related factors (3)

Answer 1

Absorbed dose
Dose rate
Type and energy

Question 2

Probability of an effect
No threshold

Answer 2

Stochastic

Question 3

Severity of injury(NOT probability)
With threshold

Answer 3

Deterministic

Question 4

Low energy secondary electrons

Answer 4

Delta

Question 5

Delta rays result in a unique ionization pattern in which closely spaced ionization occurs over a short range along the path of the primary ionization track

Answer 5

Spurs

Question 6

Longer and less frequent pear shaped tracks

Answer 6

Blobs

Question 7

Cells are
most sensitive to radiation during
Least sensitive

Answer 7

M phase and the gap bet S phase and mitosis(G2)

During DNA synthesis(S phase)

Question 8

Temporary hair loss

Answer 8

Occurs at 3weeks(3-6 Gy)

Question 9

Most radioSENSITIVE(repro)

Answer 9

Spermatogonia
Intermediate follicles

Question 10

Most radioRESISTANT(repro)

Answer 10

Mature spermatozoa
Small follicles

Question 11

Radiosensitive(blood)

Answer 11

Lymphocytes

Question 12

> 12Gy

Answer 12

Gastro syndromes

Question 13

Greatest sensitivity for rad induced mental retardation

Answer 13

8-15th week

Question 14

Only organ system that has shown an association bet malformations and low LET radiation doses

Answer 14

CNS