What does HR stand for?

Hard Radiation

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

Other Resources:

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Samples in periodicals archive:

00 Paperback QP82 With plans now afoot for the US to resume flights to the moon and thus subject astronauts to hard radiation, NASA requested information from the Council.

Managing space radiation risk in the new era of space exploration

The company believes that simultaneous imaging of both soft and hard radiation will improve tissue characterization without requiring a second beam of radiation, thereby avoiding the problems of time lag, registration artifacts, and increased radiation dose.

RSNA 2005 review: Part 1