The phrase "radiation dosage" refers to the amount of radiation a person or object receives. It is a measure of how much exposure to radiation has occurred. Full definition
The optimized materials yield high - resolution X-ray images already at a low radiation dosage. (sciencedaily.com)
That meant they had to survive not only the increased radiation dosage, but also exposure to vacuum and the loss of water. (astrobio.net)
Puff by puff, the poison builds up to the equivalent radiation dosage of 300 chest x-rays a year for a person who smokes one and a half packs a day. (scientificamerican.com)