55,

56,

57.

58,

59,

60,

61,

The gold standard for the diagnosis of osteoporosis is ;
(ಹ) Dual energy X-ray absorptiometry

(B) Single energy X-ray absorptiometry

(ಲ) Ultrasound

(D) Quantitative computed tomography

In order to check for possible leakage of radioactive material from a cobalt camera the
is used.

(A) TLD (B) 65 (O GMcounter (D) DRD

The optimal film speed for intra-oral radiography is :
(A) Cspeed (8) D speed (ಲ) Espeed (D) Fspeed

What does a “cell survival curve” describe ?

(ಹಿ) The relationship between the radiation dose and the number of cells that have gone
through one mitosis after irradiation.

(8) The relationship between the radiation dose and the proportion of cells that remain
clonogenic.

(ಲ) The relationship between the radiation dose and the number of cells that have not
suffered the loss of a specific function.

(D) The relationship between the radiation dose and the proportion of cells that can produce
DNA.

Which of the following statements is false ?

(5) Cells are more sensitive to X-rays in the presence of oxygen than in its absence (i.e.
under hypoxia).

(B) By “oxygen enhancement ratio” (OER) is meant the ratio of hypoxic to aerated doses
needed to achieve the same biological effect.

(C) For sparsely ionizing radiation, the OER is about 3 at high doses and about 2 at low
doses (i.e. at doses of the order of the daily dose per fraction in radiotherapy).

(D) The OER does not vary with the phase of the cell cycle.

The effective dose for a multiple-slice chest CT-scan is :
(A) 1mSv. (B) 2mSv. © 485. (D) 8mSv.

Which radiologic test is used to diagnose gallstones ?

(A) Barium enema (8) Intravenous pyelogram
(ಲ) Cholangiography (D) ஊர
9 072/2017

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