0.05–0.50
Gy (5–50 rads) |
Incidence of
failure to implant may increase slightly, but surviving embryos will
probably have no significant (noncancer) health effects |
Incidence
of major malfor-mations may increase slightly
Growth retardation possible |
Growth retardation
possible
Reduction in IQ possible (up to 15 points,
depending on dose)
Incidence of severe mental retardation up
to 20%, depending on dose |
Noncancer
health effects unlikely |
Noncancer
health effects unlikely |
>
0.50 Gy (50 rads)
The expectant mother may be experiencing
acute radiation syndrome in this range, depending on her whole-
body dose. |
Incidence of
failure to implant will likely be large,‡ depending on dose
but surviving embryos will probably have no significant (noncancer)
health effects |
Incidence
of miscarriage may increase, depending on dose
Substantial risk of major malfor-mations
such as neurological and motor deficiencies
Growth retardation likely |
Incidence
of miscarriage probably will increase, depending on dose
Growth retardation likely
Reduction in IQ possible
(› 15 points, depending on dose)
Incidence of severe mental retardation ›
20%, depending on dose
Incidence of major malfor-mations will probably
increase |
Incidence
of miscarriage may increase, depending on dose
Growth retardation possible, depending on
dose
Reduction in IQ possible, depending on dose
Severe mental retardation possible, depending
on dose
Incidence of major malfor-mations may increase |
Incidence of
miscarriage and neonatal death will probably increase depending on
dose§ |
Note: This table is intended
only as a guide. The indicated doses and times post conception are
approximations. |