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Biophysics 1 > Additional Semifinal Topics 1st semester > Flashcards

Additional Semifinal Topics 1st semester Flashcards

1
Q

Consider the 12 limb system in ECG. Active electrode is not placed on which limb?

A) Right Arm

B) Left Arm

C)Right Foot

D)Left Foot

A

C) Right Foot

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2
Q

What is the unit of absorbed dose?

A) Bq

B) C/kg

C) Gy

D) Sv

A

C) Gy

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3
Q

What type of leads are the Goldberger ECG leads?

A) Unipolar limb leads

B) Bipolar limb leads

C) Unipolar chest leads

D) Bipolar chest leads

A

A) Unipolar limb leads

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4
Q

What is the unit for the equivalent dose?

A) Bq

B) C/kg

C) Gy

D) Sv

A

D) Sv

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5
Q

Choose the properties of stochastic radiation effect

A) If the dose increases the probability of the effect also increases

B) If the dose increases the severity of the effect also increases and the dose threshold is zero

C) If the dose increases the severity of the effect also increases and the dose threshold is larger than zero

D) It can only be observed on the molecular level

A

A) If the dose increases the probability of the effect also increases

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6
Q

What type of isotope should be used for SPECT?

A) Negative beta emitter

B) Positive beta emitter

C) Gamma emitter

D) SPECT is not an isotope diagnostic method

A

C) Gamma emitter

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7
Q

Which method does not detect radiation originating from the body?

A) Gamma camera

B) CAT scan

C) SPECT

D) PET

A

B) CAT scan

Computerized Tomography scan

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8
Q

What is the unit of exposure?

A) Bq

B) C/kg

C) Gy

D) Sy

A

B) C/kg

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9
Q

In the case of deteministic changes

A) The probability of the damage depends on the dose.

B) There is a threshold dose and the severity of the damage doesn’t depends on the dose

C) There is a threshold dose and the severity of the damage depends of the dose.

D) There is no threshold dose

A

C) There is a threshold dose and the severity of the damage depends on the dose.

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10
Q

The coincidence connection of the opposite detectors in PET means that

A) At a given moment only one of them transmits the signal

B) A signal is transmitted only if two photons arrive at the same time to both of the detectors

C) A signal is transmitted only if two positrons arrive at the same time to both of the detectors

D) The instrument doesn’t function properly

A

B) A signal is transmitted only if two photons arrive at the same time to both of the detectors

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11
Q

The absorbed dose

A) The amount of charge absorbed in unit mass

B) The amount of energy arrived through the radiation in unit mass

C) The amount of energy absorbed in unit mass

D) The amount of positve charges created by radiation in unit mass

A

C) The amount of energy in unit mass

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12
Q

What kind of isotopes can be used for “in vivo” diagnostic purposes?

A) Alpha-emitting

B) Negative beta-emitting

C) Gamma-emitting

D) Neutron-emitting

A

C) Gamma-emitting

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13
Q

The effective half life of an isotope is the

A) Sum of the biological and physical half-life

B) Sum of the reciprocal value of the biological and physical half life

C) The reciprocal value of the effective half life is the sum of the reciprocal values of biological and physical half life.

D) Is the product of the physical and biological half life

A

C) The reciprocal value of the effective half life is the sum of the reciprocal values of biological and physcial half life.

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14
Q

In the case of negative beta-decay the mass number

A) Decreases by 1

B) Increases by 1

C) Remains the same

D) Decreases by 2

A

C) Remains the same

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15
Q

The effective half-life…

A) Is the product of the physical and biological half-lives

B) Is the sum of the physical and biological half-lives

C) Is the reciprocal of the sum of the reciprocals of the physical and biological half-lives

D) Is the reciprocal of the product of the reciprocals of the physical and biological half-lives

A

C) Is the reciprocal of the sum of the reciprocals of the physical and biological half-lives

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16
Q

In which case does the mass number change?

A) Alpha decay

B) Positive beta decay

C) Negative beta decay

D) Gamma decay

A

A) Alpha decay

17
Q

According to the ALARA principle

A) The cost of radiation protection of workers at workplaces with radiation hazard should be minimized

B) The accuracy of dose measurement should be kept at the reasonably achievable level

C) The cost of treatment of workers at workplaces with radiation hazard should be minimized

D) The exposition of workers at workplace with radiation hazard should be kept at the reasonable least achievable level

A

D) The exposition of workers at work plces with radiation should be kept at the reasonable least achievable level

18
Q

According to the ALARA principle…

A) Radiotherapy has to pe planned according to the principals of cost minimization

B)The exposition of workers at workplaces with radiation hazard should be kept at the reasonably achievable least level.

C) The exposition of the population should be kept at the reasonably least achievable level.

D)The exposition of workers at workplace with radiation hazard should be kept at the technically achievable least level.

A

B) The exposition of workers at workplace with radiation hazard should be kept at the reasonably achievable least level.

19
Q

In case of Stochastic effect…

A) The severity of damage increases with dose

B) The probability of occurence increases with dose

C) There is a dose threshold

D) The probability of occurence is independent of dose

A

B) The probability of occurence increases with dose

20
Q

The physical and biological half-life times of a given radionuclide are both one-day. What is the effective half-life time?

A) 0,5 day

B) 1 day

C) 2 day

D) 4 day

A

A) 0,5 day

21
Q

During negative-beta decay the mass number…

A) Increases by two

B) Increases by one

C) Doesn’t change

D) decreases by one

A

C) Doesn’t change

22
Q

In which of the processes does the atomic number remain constant?

A) Alpha decay

B) Positive-beta decay

C) Negative-beta decay

D) Gamma decay

A

D) Gamma decay

23
Q

During negative-beta decay the atomic number…

A) Increases by one

B) Decreases by one

C) Increases by two

D) Decreases by two

A

B) Increases by one

24
Q

During positive-beta decay the atomic number…

A) Increase by one

B) Decrease by one

C) Increase by two

D) Decrease by two

A

B) Decrease by one

25
Q

During alpha decay the atomic number…

A) Increased by 4

B) Decreases by 4

C) Increased by 2

D) Decreased by 2

A

D) Decreased by 2

Biophysics 1 (5 decks)

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