18 Questions
During which stage of conception development is the embryo most sensitive to the lethal effects of ionizing radiation?
Pre-implantation
What risks for the fetus are associated with radiation exposure during the pre-implantation phase?
Severe mental retardation
At what point during gestation can irradiation cause functional disabilities?
After 30 weeks
What is the most likely outcome of cellular damage to the embryo in the first three weeks of gestation?
Death of the embryo/fetus
Which phase of conception development involves days 0 to 14 and has a relatively small number of cells in the embryo?
Pre-implantation
What effect can radiation exposure have on the live-born child if it occurs before or immediately after the implantation of the embryo?
Lethal effects
At what dose threshold do malformations typically occur?
100-200 mGy
During which stage of pregnancy is the fetus most sensitive to the effects of radiation on the central nervous system?
8-15 weeks
What is the threshold for malformations associated with central nervous system problems caused by radiation during pregnancy?
0.2 Sv
When are malformations most likely to be caused during pregnancy?
8-15 weeks after pregnancy
At what stage of pregnancy does the fetus become more resistant to the effects of radiation?
16 weeks on
At what weeks post-conception is the central nervous system particularly sensitive to radiation exposure?
8-15 weeks
What fetal dose range can result in severe mental retardation and microcephaly?
> 1 Sv
When is mental retardation not observed to be induced by radiation exposure?
Before 8 weeks from pregnancy
What kind of effect is observed on IQ with increasing radiation dose?
General downward shift
Between which weeks of gestation were severe abnormalities observed due to radiation exposure?
4-11 weeks
What level of exposure is necessary to cause a miscarriage during the fetus' sensitivity period to x-rays?
> 50 mSv
At what dose would no effect be detectable in the general distribution of IQ, according to the text?
$0.2$ Sv
This quiz covers the radiation-related risks throughout pregnancy, focusing on the stage of pregnancy and absorbed dose. It explains how fetal radiation risks are most significant during organogenesis and in the early fetal period, with specific sensitivity during the first 8 weeks. The quiz also includes information on dose measurements and effects.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
