The RBE (relative biological effectiveness factor) for several different types o

Question

The RBE (relative biological effectiveness factor) for several different types of radiation is shown in the chart below.

Using the above chart, determine the dose in Sv for maximum biological effectiveness from each of the following.

(a)A 0.2 Gy -ray

  Sv

(b)A 3.4 mGy exposure to the eye by fast protons

Sv

(c)A 1.6 mGy exposure to particles

  Sv

Type of Radiation RBE X-rays and gamma rays 1.0 Beta particles 1.0 – 1.7 Alpha particles 10 – 20 Thermal neutrons 2 – 5 Fast neutrons and protons to the eye 32 Fast neutrons and protons 10 Heavy ions 20

Explanation / Answer

a) dose = number of rad x RBE x0.01 Sv

= 0.2 x 10 x 0.01

= 0.02 Sv

b) dose =  number of rad x RBE x0.01 Sv

= 3.4 x 0.001 x 32 x 0.01

= 0.00109 Sv

c) dose = 1.6 x 0.001 x 20 x 0.01

= 0.00032 Sv

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