Biology

deterministic effect is when :

• the incident of response increases with radiation dose

• the severity of response increases with radiation dose

The Radiation sensitive target molecule is :

• Proteins

• Carbohydrates

• DNA

• Water

From the following which is considered direct ionizing radiation :

• photon ,electron

• Electron,proton

• Photon,neutron

• Neutron,proton

are molecules that

exercise regulatory control over some

body functions, such as growth and

development.

• Proteins

• lipids

• Enzymes

• Hormones

Humans are most sensitive to radiation

• Before birth

• After birth

Diagnostic x-ray beams

 

• are neither

  intense enough nor large enough to

  cause death

• are

  intense enough and large enough to

  cause death

Prodromal Period occur at radiation doses

• excess of

  approximately 50 Gyt (5000 rad)

• below approximately 1 Gyt (100 rad)

• above approximately 1 Gyt (100 rad)

• approximately 10 to 50 Gyt (1000–5000 rad)

Tissue is more sensitive to radiation when irradiated

in the :

• under anoxic

• oxygenated state

• under hypoxic

physical factors affect the degree of radiation

response include:

• All above

• Relative Biologic Effectiveness

• Linear Energy Transfer (LET)

• Protraction and Fractionation

LET of diagnostic X-ray is approximately:

• 3kev

• 10kev\um

• 1 m

• 3kev\um