Exposure - Being exposed to ionizing radiation, radioactive material, or other hazardous materials. Radiation exposure is measured in Roentgens (R) or the subunit milliroentgens (mR). For practical. purposes, one roentgen is equal to one rem.
581-590 Credit Score: A score in this range is evident of a poor credit history, which is a turn-off for many lenders. 591-600 Credit Score: Get your score up to 600 to become eligible for more types of loans and at lower interest rates. This is still borderline poor credit.
1 In the Fair, Isaac credit bureau systems, which is probably what you've got in mind, the range is from somewhere in the low 300's to something close to 900..  2 A score range may be 0-800, 40-400, or some other range of numbers..  FICO scores range from 300 to 850..