4 Factors Affecting Radiosensitivity

Question 1

LET units are expressed as…

Answer 1

Units of kiloelectron Volt of energy transferred per micrometer.

Question 2

How many LET’s in X-rays?

Answer 2

3 units of kiloelectron volt of energy transferred per micrometer.

Question 3

LET is the acronym for…

Answer 3

Linear Energy Transfer

Question 4

LET is the measure of the rate….

Answer 4

At which energy is transferred from ionizing radiation to soft tissue.

Question 5

As LET radiation goes up…..

Answer 5

More direct damage is created compared to indirect.

Question 6

RBE is the acronym for….

Answer 6

Relative Biologic Effectiveness

Question 7

In RBE, as LET radiation increases….

Answer 7

The ability to produce biological damage also increases.

Question 8

How many RBE’s in X-rays?

Answer 8

1 RBE

Question 9

Protraction refers to…

Answer 9

Dose rate

Question 10

Protraction is…

Answer 10

A dose given over a long period of time, continuously at a lower dose rate.

Question 11

Fractionation is….

Answer 11

The same does given in equal portions at regular intervals.

Question 12

Why does does fractionation have less effect?

Answer 12

Because it allows cells to undergo repair and recovery between doses.

Question 13

What is the equation for RBE?

Answer 13

Dose of standard radiation necessary to produce a given effect/ Dose of text radiation necessary to produce the same effect.

Question 14

Radiation w a lower LET than X-rays have a RBE less than 1 whereas…..

Answer 14

Radiation w higher LET have a higher RBE.

Question 15

LET is a method of expressing radiation quality and….

Answer 15

Determining the value of radiation weighting factor (Wr) used in radiation protection.