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RADIATION & PREGNANCY

Physics

RADIATION & PREGNANCY

1. Deterministic effects (on the foetus) have a threshold of 100 mSv: death, low IQ, malformations. Risk is greater in early pregnancy.

2. Cancer risk (for the child) is about 1 in 10,000 per mSv.

3. Decision to terminate pregnancy in the event of irradiation:
- Cannot justify termination of pregnancy with dose < 100 mGy. > 99% chance that child will not develop a childhood cancer.
- Dose 100 - 500 mSv: decision to terminate is based on individual circumstances.
- Dose > 500 mSv: there may be significant foetal damage.

4. Stages of the foetus:
- Pre-implantation: 0 - 10 days.
- Organogenesis: 10 days - 6 weeks.
- Foetal growth: 6 weeks - term.


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REFERENCES

1. Bushberg, J. T. (2012). The essential physics of medical imaging. Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins. Find it at Amazon
2. Heggie, J. C., Liddell, N. A., & Maher, K. P. (1997). Applied imaging technology. Melbourne: St. Vincents Hospital.

Ⓒ A. Manickam 2018

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