- Using the definition of a sievert, as an absorbed dose of one joule per kilogram (J/kg), calculate the total amount of energy (in joules) absorbed by a 750 g guinea pig at the lethal dose level.
- Using the definition of a sievert, calculate the total amount of energy (in joules) absorbed by a 2.34 kg rabbit at the lethal dose level.
- Assuming the lethal dose for a human is 4.1 Sv, calculate the total amount of energy (in joules) absorbed by a 58 kg adult at the lethal dose level.
- A typical cup of tea (250 mL) when consumed at 85oC will yield nearly 200 J of thermal energy to a human's stomach.
a) What absorbed dose of radiation would be required to deliver the same amount of energy to a 60 kg human (by radiation)?
b) What is the difference between these two cases (i.e. energy from a teacup and
energy from incident radiation)?
- The chart below shows the maximum permissible absorbed dose for occupational exposure. Complete the chart by calculating the total absorbed energy and the number of equivalent proton absorptions needed to produce this effect.
| body part |
absorbed dose
(Sv ·a-1) |
energy (J ·a-1·kg-1) |
number(n) of absorbed
2GeV protons
(n·a-1·kg-1) |
| skin |
0.15 |
|
|
| hands |
0.75 |
|
|
| forearms |
0.30 |
|
|
| bone marrow |
0.05 |
|
|
| lenses of the eyes |
0.04 |
|
|
Sv·a-1 = sievert per year
1J = 6.24x1018eV
|
