lesson 6

Question 1

● It is the charged liberated by ionizing
radiation (low-energy photons) per unit
mass of air.
● The old unit for radiation exposure or
intensity in air is Roentgen(R).
● The S.I. (Systeme Internationale) unit is
coulomb per kilogram (c/kg)

Answer 1

EXPOSURE (X)

Question 2

● It is the energy deposited by ionizing per
unit mass of irradiated material.
● The old unit for radiation absorbed dose
is Rad.
● The S.I. unit is Gray (Gy).

Answer 2

ABSORBED DOSE

Question 3

● It is the kinetic energy of charged
ionizing particles liberated per unit mass
of the specified material by uncharged
ionizing particles.
● The common derived unit of kerma is
joule per kilogram (J/kg or J.kg -1) with
the special name Gray (Gy).
● The unit of kerma rate is Gray per
second (Gy/s or Gy.s-1).
● Air kerma and tissue kerma differ by
less than 10%.

Answer 3

KERMA ( Kinetic Energy Released per unit
Mass)

Question 4

● It is used to express the amount of
exposures received by a radiation
worker.
● The old unit is REM (roentgen
equivalent man).
● The S.I. unit is Sievert (Sv).

Answer 4

DOSE EQUIVALENT

Question 5

● It is the disintegration of atoms per unit
of time by a radioactive material.
● The old unit is Curie (Ci).
● The S.I. unit is Becquerel (Bq)

Answer 5

ACTIVITY (A)

Question 6

• old unit used of radiation exposure or
  intensity in
  air.
• the S.I. unit is coulomb per kilogram(c/kg)
• 1 R = 2.58 X 10-4 c/kg
• 1 c/kg = 3876 R

Answer 6

ROENTGEN(R)

Question 7

• old unit of radiation absorbed dose.
• the S.I. unit is Gray(Gy)
• 1 Rad = 100 ergs/gram
• 1 Rad = 1 X 10-2 Gy = 0.01 Gy
• 1 Gy = 100 Rad

Answer 7

RAD

Question 8

• roentgen equivalent man
• the old unit of dose equivalent or
  occupational
  exposure.
• the S.I. unit is Sievert(Sv)
• 1 Rem = 1 x 10-2 Sv = 0.01 Sv
• 1 Sv = 100 Rem

Answer 8

REM

Question 9

• the old unit of the quantity of radioactive
  material.
• the S.I. unit is Becquerel(Bq)
• 1 Ci = 3.7 X 1010 Bq
• 1 Bq = 1dps
• 1 Bq = 3.7 X 1010 dps

Answer 9

CURIE(Ci)

Question 10

1 R =
1 Rad =
1 Rem =
1 Ci =
1 Rad =
1 Gy =
1 Sv =
1 MBq =
1 GBq =
1 Ci =

Answer 10

1 R = 2.58 X 10-4 c/kg
1 Rad = 0.01 Gy
1 Rem = 0.01 Sv
1 Ci = 3.7 X 1010 Bq
1 Rad = 1,000 mRad
1 Gy = 100 cGy
1 Sv = 1,000,000 μSv = 1 x 10^6 μSv
1 MBq = 1,000,000 Bq = 1 X 10^6 Bq
1 GBq = 1,000,000,000 Bq = 1 X 10^9 Bq
1 Ci = 1,000 mCi