Question

1.5 Gy of gamma radiation are directed into a 150 g tumour

during radiation therapy. How much energy does the tumour

absorb?

Short answer

Hence, tumour absorbs the energy of$0.225\mathrm{J}$

Step-by-step solution

Given information

1.5 Gy of gamma radiation are directed into a 150 g tumour

during radiation therapy.

Conversion

Converting these values, we get

$$\begin{gathered} 1\mathrm{Gy}=1.00\mathrm{J}/\mathrm{kg} \\ 1.5\mathrm{Gy}=1.50\mathrm{J}/\mathrm{kg} \\ 150\mathrm{g}\to 0.150\mathrm{kg} \end{gathered}$$

Calculations

The energy absorbed by tumour is:

$$\begin{gathered} E_{\text{absorbed}}=\left(\text{Absorbed energy}\right)\times \left(\text{Tumor weight}\right) \\ {E}_{\text{absorbed}}=(1.50\mathrm{J}/\mathrm{kg})\times (0.150\mathrm{kg}) \\ {E}_{\text{absorbed}}=0.225\mathrm{J} \end{gathered}$$