US states using the concept of IDR?? While I'm reading IAEA safety report 47, I've learned the concept of IDR, instantneous dose rate, which is commonly used in UK. IDR is the tool for recommendation of the limit of high dose rate in a short time, e.g., an hour. Generally, in US, NCRP is the common recommendation as I know, there is not recommendation for the limit of high dose rate in any hour but just averaged over a week or a year. However my prof. said that there are some states in US using the concept of IDR and asked me to find that states. Do you guys know anything about my question? I'm waiting.