# Equation to calculate absorbed dose of radiation?

1. Mar 1, 2017

### Littlegirloud

1. The problem statement, all variables and given/known data
Calculate the absorbed dose of radiation for tissue that suffers a mean energy absorbed of 420 Joules in a quantity of tissue that has a mass of 60g.

2. Relevant equations
This is really my question. No relevant equation is provided in these materials so my independent research (and the data given) suggests I could use D = E/M, but is that the most appropriate?

3. The attempt at a solution
D = E\M
D = 420/60
D = 7
D = 7 J kg-1

2. Mar 1, 2017

### Choppy

Radiation dose is generally reported in terms of mean energy deposited per unit mass.

You might want to double check the 60 g vs kg though.

3. Mar 2, 2017

### Littlegirloud

I've checked again and it is definitely 60 grams. Does that mean I need to equate the tissue dose to kg so it tallies with the final measure?

Perhaps?
D = E\M
D = 420/0.06
D = 7
D = 7000 J kg-1

4. Mar 4, 2017

### Staff: Mentor

The final value looks good. I don't know what happened in the second to last line though.