To convert roentgens (R) to rad, you typically use the conversion factor of 1 R being approximately equal to 1 rad for gamma and X-ray radiation in air. Therefore, 31 roentgens is approximately 31 rads. However, the exact conversion can vary based on the type of radiation and its energy, so it's important to consider the context in specific situations.
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.