One gray=0.01 Rads...Incorrect (very), Correct.....One Gray = 100 Rads.
An exposure of 0.02 what? No units are given, so conversion to roentgens cannot be made.
200 to 1000 rads will cause illness with a greater effect towards the end. Any dose over 1000 rads will often prove to be fatal.
1 gray
270 roentgens causes death in 20% of people within 2 to 6 weeks. The rate of death increases as the roentgens of radiation increases, 1,000 roentgens being enough to ensure 100% death rate from radiation sickness and 5,000 roentgens causing instant incapacitation and death within a week.
X Rays
Roentgens are units of radiation exposure used for x-rays and gamma rays. They are defined in terms of the number of ions produced in one cubic centimeter of air by the radiation.
BI-RADS is simply the word used in the categories of mammogram results. BI-RADS 0 means additional imaging is needed. BI-RADS 1 means no evidence of cancer. BI-RADS 5 means likely cancer. There are a range of results in between.
Rads
The cast of Rads 1000 - 1972 includes: John Steiner
BI-RADS is a system of categorizing results of mammograms. BI-RADS 2 means that the finding is benign -- not cancer. Such a result would be typical if a lymph node were found in the breast.
BI-RADS 4 on a mammogram means there is a suspicious abnormality, and a biopsy might be required. It does not necessarily mean cancer.