Radiological Units, Quantities, And Terminology

Question 1

Exposure

Answer 1

Energy deposited by ionization radiation

Question 2

Roentgen (R)

Answer 2

The amount of x-ray or gamma radiation less than or equal to 3 MeV, rthat will produce in 2.58x10^-4 charge per kg of air.

Question 3

Absorbed Dose (D)

Answer 3

The energy imparted by ionizing radiation per unit of mass of irradiated material (Energy = per unit of mass)

Question 4

Units of absorbed dose

Answer 4

Gray or rad.

Question 5

Rad

Answer 5

Unit of absorbed dose that is qual to the absorption of 100 ergs per gram

Question 6

Quality Factor

Answer 6

The factor that is multiplied by the absorbed dose (D) to obtain a quantity which is equal to the dose equivalent (HT)
HT=DQ

Question 7

Quality factor for photons (gamma rays and x-rays)

Answer 7

1

Question 8

Quality factor for beta+ and beta-

Answer 8

1

Question 9

Quality factor for thermal neutrons

Answer 9

2

Question 10

Quality factor for fast neutrons

Answer 10

10

Question 11

Quality factor for Protons

Answer 11

10

Question 12

Quality factor for Alpha particles

Answer 12

20

Question 13

Dose Equivalent (HT)

Answer 13

HT=DQ
Purpose is to have a single unit of radiation regardless of type to have a single unit to describe it’s effects on humans.

Question 14

Rem per NAVMED P50-55

Answer 14

Unit of HT which is = to the absorbed dose in rad multiplied by the quality factor
(HT=DQ)

Question 15

Rem per NNPP
(Know this verbatim)

Answer 15

“The amount of any type of radiation that will cause the biological damage equivalent to 1 rad of gamma radiation”

Question 16

Sievert

Answer 16

1 Sv = 100 rem

Question 17

Man-rem

Answer 17

Total amount of radiation dose received by all the individuals in a specific group over a specific time.

Question 18

Effective Dose Equivalent (HE)

Answer 18

The sum of the weighting factors as applicable to each of the body organs or tissue and the dose equivalent to these body organs and tissues (HE=WT*HT)

Question 19

Deep Dose equivalent (Hd)

Answer 19

External exposure to the entire body at a tissue depth of 1 cm.

Question 20

Shallow Dose Equivalent (Hs)

Answer 20

External exposure to the skin at a tissue depth of 0.007 cm

Question 21

Eye Dose Equivalent

Answer 21

External exposure to the lens of the the eye at a tissue depth of 0.3 cm

Question 22

Committed Dose Equivalent (HT,50)

Answer 22

Dose equivalent to an organ or tissue that will be received from an intake of radioactive material by an individual over the 50-year period after the intake

Question 23

Committed Effective Dose Equivalent

Answer 23

The sum of products of the weighting factors applicable to Each of the body tissues or tissues that are irradiated and the committed dose equivalent to these organs or tissues.

More simply put, the Internal dose of radiation.

Question 24

Total Effective Dose Equivalent (TEDE)

Answer 24

TEDE=DDE+CEDE
The external dose and internal dose put together.

Question 25

ALARA meaning

Answer 25

“As Low As Reasonably Achieve”.