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Define X-ray attenuation .

Important Questions on Medical Imaging

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Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

In an

X

-ray tube, electrons emitted from a filament (cathode) carrying current

I

hit a target (anode) at a distance

d

from the cathode. The target is kept at a potential

V

higher than the cathode resulting in emission of continuous and characteristic X-rays. If the filament current

I

is decreased to

\frac{I}{2},

the potential difference

V

is increased to

2 V,

and the separation distance

d

is reduced to

\frac{d}{2},

then

EASY

Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

An X-ray tube is operated at

1.24

million volt. The shortest wavelength of the produced photon will be:

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Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

The shortest wavelength of

X

-rays emitted from an

X

-ray tube depends upon

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Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

W. K. Roentgen discovered

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Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

What are cathode rays?

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Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation,

HARD

Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

X

-rays of wavelength

λ_{0} = 0.200 nm

are scattered from a block of material The scattered

X

-rays are observed at an angle of

45 °

to the incident beam. Calculate their wavelength.

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Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

For the structural analysis of crystals,

X -

rays are used because:

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Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

In a discharge tube when

200 volt

potential difference is applied

6.25 \times 10^{18}

electrons move from cathode to anode and

3.125 \times 10^{18}

singly charged positive ions move from anode to cathode in one second. Then the power of tube is:

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Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

Represent the union of two sets by Venn diagram for each of the following.

$X = {x | x$ is a prime number between $80$ and $100}$

$Y = {y | y$ is an odd number between $90$ and $100}$

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Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

The filament current in the electron gun of a coolidge tube is increased while the potential difference used to accelerate the electrons is decreased. As a result, in the emitted radiation

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Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

The X-ray beam coming from an X-ray tube will be

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Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

Consider a metal used to produce some characteristic

X -

rays. The energy of

X -

rays is given by

E

and wavelength as represented by

λ

. Then which of the following is true:

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Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

The potential difference applied to an X - ray tube is 5 kV and the current through it is 3.2 mA. The number of electrons striking the target per second is .............. (Take

e = 1.6 \times 10^{- 19} C

)

EASY

Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

The wavelengths of

K_{a}

x

-rays of two metals

‘ A ’

and

‘ B ’

are

\frac{4}{1875 R}

and

\frac{1}{675 R}

respectively, where

‘ R ’

is rydberg constant. The number of elements lying between

‘ A ’

and

‘ B ’

according to their atomic numbers is________

EASY

Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

An X-ray tube produces a continuous spectrum of radiation with its shortest wavelength of

45 \times 10^{- 2} Å

. The maximum energy of a photon in the radiation in

eV

(h = 6.62 \times 10^{- 34} J s, c = 3 \times 10^{8} {m s}^{- 1})

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Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

Consider a photon of continuous X-ray coming from a Coolidge tube. Energy of photon comes from

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Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

Energy of characteristic

X

-ray is a consequence of

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Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

An X-ray tube operates at

20 kV .

Suppose the electron converts

70 %

of its energy into a photon at each collision. Find the lowest three wavelength emitted from the tube. Neglect the energy imparted to the atom with which the electron collides.

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Physics>Modern Physics>Medical Imaging>Producing X-rays and its Interaction with Matter

The characteristic X-ray spectrum is emitted due to transition of

Define X-ray attenuation .

Important Questions on Medical Imaging

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