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Extra resources for Applications of Research Reactors (IAEA TECDOC-1234)
6 of 100 000 people develop glioblastoma multiforme in the United States each year. The largest single age group diagnosed with this cancer is age 65 to 74, followed by age 75 and up. Approximately 2/3 of the diagnosed patients are over age 65. 6 out of 100 000), there would be about 780 cases per year in a country that has a population of 30 000 000. Because the expected lifetime in some countries is lower than in the USA, the incident rate should be lower. In addition, for a country with a widely dispersed rural population, some diagnoses will be missed.
Use of a neutron guide Thermal neutron guides, including super mirror guides, can be used to conduct the neutrons from the beam port to a region away from the background neutrons near the reactor. In many cases, the neutrons are conducted through a guide into a separate building adjacent to the reactor building. This process provides a major improvement in the signal to noise ratio (neutron signal to neutron background ratio). While guides are routinely utilized at high power level research reactors, they are especially useful for an intermediate power level reactor.
Neutron beam guide tubes. 7. Cold neutron source Cold neutrons are commonly defined as those having wavelengths longer than 4 ångströms, corresponding to the Bragg cut-off in beryllium. The intensity of cold neutrons is only about 1 to 2% of the total neutron flux in the thermal distribution for the normally extracted neutron beam of a research reactor. A device for increasing the cold neutron flux about 20 to 40 times the normal value at 5 ångströms using a low temperature moderator is called a cold neutron source (CNS).