Assertion: atom's number | /r/HasProperty | 8 to 15 weeks post-conception
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Source sentences:
text: While a lack of statistical data, with just 30 individuals out of 1,800, prevents a definitive determination of a threshold point, the data collected suggests a threshold interuterine or fetal dose for SMR, at the most radiosensitive period of cognitive development, when there is the largest number of undifferentiated neural cells (8 to 15 weeks post-conception) to begin at a threshold dose of approximately "0.09" to "0.15" Gy, with the risk then linearly increasing to a 43% rate of SMR when exposed to a fetal dose of 1 Gy at any point during these weeks of rapid Neurogenesis.