Final answer:
The ICRU establishes standards for radiation measurement, the ICRP focuses on protecting people from radiation, and the NCRP advises the U.S. government on radiation protection.
Step-by-step explanation:
The International Commission on Radiological Units and Measurements (ICRU) is responsible for establishing and maintaining international standards for the measurement and use of ionizing radiation. They develop and recommend radiation measurement quantities and units, such as the gray (Gy) and sievert (Sv), to ensure accurate and consistent radiation dose measurements.
The International Commission on Radiological Protection (ICRP) is focused on protecting people and the environment from the harmful effects of radiation. They develop recommendations for radiation protection, set dose limits, and provide guidance on the use of radiation in various applications.
The National Committee on Radiation Protection and Measurements (NCRP) is an independent organization that advises the U.S. government on radiation protection issues. They develop and publish reports and recommendations on radiation protection practices and standards in various fields, including medicine, nuclear power, and public health.