(Prelims) Units and Qtts

Question 1

SKIN ERYTHEMA DOSE to receive a quantity of radiation that causes diffuse redness over an area of skin after irradiation

Answer 1

20 minutes of exposure

Question 2

Skin erythrma dose exposure involves— of Gy

Answer 2

several hundreds

Question 3

INTERNATIONAL COMMISSION ON RADIATION UNITS AND
MEASUREMENTS (ICRP) was established.

Answer 3

1925

Question 4

ROENTGEN becomes internationally accepted as the unit of
measurement for x-radiation and gamma radiation exposures.

Answer 4

1937

Question 5

1R = C/kg

Answer 5

2.58 x 10 ^(-4) C/kg

Question 6

1 C/kg = R

Answer 6

3876 R
1 / 2.58 x 10 ^(-4)
3.88 x 10 ^(3)

Question 7

The international system of units were developed.

Answer 7

1948

Question 8

ROENTGEN is redefined to increase accuracy and acceptability

Answer 8

1962

Question 9

ICRU adapted the SI units for use with IR

Answer 9

1980

Question 10

NATIONAL COUNCIL OF RADIATION PROTECTION (NCRP) adapted
the SI units for use.

Answer 10

1985

Question 11

Total electrical charge per unit mass that X-ray and gamma-ray photons with energies up to 3 MeV generated in the air only.

Answer 11

EXPOSURE

Question 12

EXPOSURE conv unit

Answer 12

Roentgen

Question 13

EXPOSURE SI unit

Answer 13

c/kg

Question 14

Amount of energy per unit mass absorbed by the irradiated object

Answer 14

AIR KERMA

Question 15

Kerma acronym for

Answer 15

Kinetic Energy Released in Matter

Question 16

Radiation energy is absorbed per unit mass and has units of J / kg or Gy

Answer 16

AIR KERMA

Question 17

AIR KERMA conv unit

Answer 17

Roentgen

Question 18

AIR KERMA SI unit

Answer 18

J/ kg or Gy

Question 19

AIR KERMA Special unit

Answer 19

Gray