Question

IONISING RADIATION QUESTION 1

Total Body Irradiation is a technique where radiation is delivered to the whole body. Which of the following statements is correct?

Select one:

a. Hyper-fractionation is where fewer sessions are given but at higher doses of radiation.

b. Hypo-fractionation is where multiple sessions are given per day at lower doses of radiation.

c. Hypo-fractionation is often used to treat aggressive tumour growths.

d. Total Body Irradiation is commonly given after a bone marrow transplant.

An x-ray photon has a frequency of 1.7x10¹⁷ Hz. What is its wavelength in nanometres (nm)? (c = 3 x 10⁸ m/s, h = 6.626 x 10^-34 Js, 1 eV = 1.6 x 10^-19 J)

Select one:

a. 0.57 nm

b. 1.8 nm

c. 0.057 nm

d. 18 nm

Nuclear medicine uses radioisotopes for both imaging and therapy. A 30g sample of a radioisotope is created in a nuclear reactor. It takes 8 hours to transport the sample to a hospital in a distant city, after which only 10g remains to be used in a patient. What is the half-life of the radioisotope?

Select one:

a. 0.20 hours

b. 5.0 hours

c. 7.3 hours

d. 0.087 hours

Answer 1

Sol +- 1:7X10 HZ da C (mame length formula) d 8 d- - Jat 3x108 1,8 nm An 17810 -nt N= No e t=8hr 10 = 30 f1.0986=76x8 da 0.1373 hr 1 Hence 0.693 N 5 kr. An ( Half Lifte time)