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Dosimetry Physics 2 > Radioactive Decay > Flashcards

Radioactive Decay Flashcards

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1
Q

Who discovered radioactivity?

A

Henry Becquerel

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2
Q

What is the radioactivity equation?

A

N=N0E^-yt

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3
Q

Radioactive decay is linear. True or False?

A

False, it is exponential

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4
Q

What is a half-life?

A

The time it takes for the original amount of activity to decay to half its original value

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5
Q

What is the equation to find half-life?

A

.693/decay constant = Half-life

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6
Q

What is the activity of a radioactive material?

A

Rate of decay

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7
Q

1 Curie is equal to ____ Bq?

A

3.7 x 10^10

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8
Q

Dose rate is inversely proportional to activity. True or False?

A

False, its directly proportional, if it decrease by half then so does the dose rate

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9
Q

What is the effective half-life?

A

The time it takes for the radioactive material to be eliminated through both physical half-life and biologic process to 0.5 activity

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10
Q

What is the effective half-life equation?

A

1/Teff = 1/Tp + 1/Tb

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11
Q

What is the mean or average life ?

A

The average lifetime of a radioactive atom before it decays

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12
Q

Equation for average life?

A

A= Half-life x 1.44

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13
Q

How do you calculate total dose?

A

Total Dose = 1.44 x Half-life x Initial Dose rate

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14
Q

During an Alpha Decay, what is emitted?

A

Helium (Alpha Particle)

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15
Q

What decay process does Co-60 undergo?

A

Beta decay to an excited Nickel-60, electron and antineutrino, then two gamma are emitted (1.17 and 1.33 for 1.25)

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16
Q

What is transient equilibrium?

A

Transient equilibrium is when the parent half-life is 10x larger than the daughter half-life to which the activities will become equal in proportion after awhile

17
Q

What is secular equilibrium?

A

Secular equilibrium is when the parent half-life is MUCH larger than the daughter, both activities will be come equal after a long time

18
Q

What is emitted by radium in a magnetic field?

A

Short path of Beta, Slanted path of alpha and straight long path of gamma

19
Q

When is alpha decay most frequent?

A

Elements with Z higher than 82

20
Q

What does a beta decay emit?

A

Neutrino or Antineutrino

21
Q

Whats. the difference with antineutrino and neutrino?

A

all same except, different spins

Dosimetry Physics 2 (6 decks)

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