Based on the limit of dose, a patient will receive 8334 chest X-rays before noticing biological effects.
Recall :
Effective dose per exposure = 0.03 mSv
- [tex] 0.03 mSv = 0.03 \times 10^{-3} Sv [/tex]
Expressing the effective dose per exposure in rem :
Let :
[tex] x [/tex] = effective dose per exposure in terms of rem
[tex] 100 = 1 [/tex]
[tex] x = 0.03 \times 10^{-3} [/tex]
Cross multiply
[tex] x = 0.03 \times 10^{-3} \times 100 = 0.003 [/tex]
Effective dose per exposure = 0.003 rem
For biological effect to be observed ;
- [tex] \frac{limit}{dose per exposure} [/tex]
- [tex] \frac{25}{0.003} = 8333.333 [/tex]
Therefore, the Number of chest X rays a patient will undergo for biological effect to be observed is 8334.
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