Radiobiology and Radiation Protection Quiz

Which phase of the cell cycle is most radiosensitive?

• G1 phase

• G2 phase

• S phase

• M phase

Which type of radiation is considered high LET?

• Gamma rays

• Alpha particles

• Beta particles

• X-rays

The effect of oxygen on radiation damage is

• It completely prevents damage

• It decreases damage

• It has no effect

• It enhances damage

How do free radicals contribute to cellular damage following radiation exposure?

• They initiate oxidative stress

• They promote healing processes

• They have a protective role

• They increase nutrient absorption

The following is a characteristic of radiosensitive cells:

• They are found in blood-forming organs

• They are found in the nervous system

• They are resistant to radiation

• They are found in muscle tissue

The primary consequence of water radiolysis in biological systems is

• Formation of free radicals

• Increased cell membrane permeability

• Alteration of protein structure

• Direct damage to cellular DNA

The following is a consequence of high LET radiation:

• More energy deposited per unit length

• Less biological damage

• Increased cell proliferation

• Lower risk of cell death

The significance of the cell cycle in radiobiology is

• It determines the type of radiation used

• It affects the sensitivity of cells to radiation

• It has no relevance to radiation exposure

• It only applies to plant cells

The main consequence of radiation exposure at high doses:

• Cell death

• Increased cell repair

• Enhanced cell division

• No effect

The type of cells are least sensitive to radiation:

• Muscle cells

• Nervous system cells

• Skin cells

• Blood-forming cells