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RadPhysics > Radiologic Units > Flashcards

Radiologic Units Flashcards

1
Q

Amount of radiation delivered to a point

A

Exposure

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2
Q

How much the ionization the beam causes in air

A

Exposure

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3
Q

Conventional unit of exposure

A

roentgen (R)

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4
Q

SI unit for exposure

A

C/kg

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5
Q

roentgen is in honor of ______

A

Wilhelm Conrad Roentgen

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6
Q

definition of roentgen

A

Quantity of X- or gamma rays …

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7
Q

Standard temperature

A

Zero degrees Celsius
32 degrees Fahrenheit
273.15 Kelvin

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8
Q

Standard Pressure

A

1 atm

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9
Q

1R = _____ C/kg

A

2.58 x 10E-4 C/kg

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10
Q

1C/kg = _____ R

A

3876 R

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11
Q

Unit of electrical charge

A

Coulomb

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12
Q

1C = _____ ionizations

A

6.242 x 10E18 ionizations

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13
Q

Concentration of radiation energy absorbed at a specific point within the body tissue

A

Absorbed dose

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14
Q

Quantity of radiation energy absorbed per unit mass of tissue

A

Absorbed Dose

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15
Q

Conventional unit of absorbed dose

A

rad

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16
Q

1 rad = ____ ergs/g

A

100 ergs/g

17
Q

SI unit of absorbed dose

A

gray (Gy)

18
Q

1Gy = ____ J/kg

A

1 J/kg

19
Q

1 rad = ____ Gy

A

0.01 Gy

20
Q

Gy is named after _____

A

Louis Harold Gray

21
Q

Pioneer in the field of measurement of radium radiation ….

A

Louis Harold Gray

22
Q

Nationality of Louis Harold Gray

A

British

23
Q

Biological impact of radiation on persons ….

A

Dose Equivalent

24
Q

Personnel exposure is recorded as ____

A

Dose equivalent

25
Q

Conventional unit of DE

A

rem

26
Q

SI unit of DE

A

sievert (Sv)

27
Q

Sievert is named after ____

A

Rolf Maximilian Sievert

28
Q

Nationality of Rolf Maximilian Sievert

A

Swedish

29
Q

Work on radiation dosage measurement and ….

A

Rolf Maximilian Sievert

30
Q

More biologically damaging to live tissue

A

Alpha particle

31
Q

Formerly known as quality factor

A

Radiation weighing factor

32
Q

Relative risk to humans

A

Effective dose

33
Q

Formula of effective dose

A

ED = AD x Wt

34
Q

Multiplier used to determine the effective dose from the equivalent dose in one or more organs or tissues

A

Tissue Weighing Factor

35
Q

Number of atoms that disintegrate per second

A

Activity

36
Q

Modern form of metric system

A

International System of units

RadPhysics (6 decks)

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