Units To lays out radiation dose units one to a row and amounts one to a column. Opened at nanosieverts, it reads any amount of them at once in millisieverts, millirem, microsieverts, rem, sieverts and every other radiation dose unit, even bananas, chest X-rays and years of background. Type an amount the way you would say it, lay out a range of amounts, and choose how many decimal places to show.