Iodine-123 (123I) is a radioactive isotope of iodine used in nuclear medicine imaging, including single photon emission computed tomography (SPECT) or SPECT/CT exams. The isotope's half-life is 13.22 hours; the decay by electron capture to tellurium-123 emits gamma radiation with a predominant energy of 159 keV (this is the gamma primarily used for imaging). In medical applications, the radiation is detected by a gamma camera. The isotope is typically applied as iodide-123, the anionic form.

Portal templates with redlinked portals

Iodine-123

In acoustics, a beat is an interference pattern between two sounds of slightly different frequencies, perceived as a periodic variation in volume whose rate is the difference of the two frequencies. When tuning instruments that can produce sustained tones, beats can be readily recognized. Tuning two tones to a unison will present a peculiar effect: when the two tones are close in pitch but not identical, the difference in frequency generates the beating. The volume varies like in a tremolo as the sounds alternately interfere constructively and destructively. As the two tones gradually approach unison, the beating slows down and may become so slow as to be imperceptible. As the two tones get further apart, their beat frequency starts to approach the range of human pitch perception, the beating starts to sound like a note, and a combination tone is produced. This combination tone can also be referred to as a missing fundamental, as the beat frequency of any two tones is equivalent to the frequency of their implied fundamental frequency.

St. Elizabeth Catholic Church is a historic Roman Catholic church at 114 Louisiana Highway 403 in Paincourtville, Louisiana, in Assumption Parish, Louisiana. It was built in 1902 and added to the National Register in 1983. It is a brick Basilica plan Gothic-style church. It has twin towers. Its gable front has a small rose window. Its interior has a small transept, three semi-hexagonal apses, and stained glass windows dating mainly to between 1906 and 1910.

America 2040

St. Elizabeth Catholic Church

In acoustics, a beat is an interference pattern between two sounds of slightly different frequencies, perceived as a periodic variation in volume whose rate is the difference of the two frequencies. When tuning instruments that can produce sustained tones, beats can be readily recognized. Tuning two tones to a unison will present a peculiar effect: when the two tones are close in pitch but not identical, the difference in frequency generates the beating. The volume varies like in a tremolo as the sounds alternately interfere constructively and destructively. As the two tones gradually approach unison, the beating slows down and may become so slow as to be imperceptible. As the two tones get further apart, their beat frequency starts to approach the range of human pitch perception, the beat

St. Emma Plantation is a 13,000-acre (5,300 ha) former sugar plantation and house in Ascension Parish, Louisiana, United States. The plantation was the scene of a Civil War skirmish in the fall of 1862. The Greek Revival plantation house was owned by Charles A. Kock, a prominent sugar planter, between 1854 and 1869. The house was listed on National Register of Historic Places in 1980.

Isotope content page

St. Emma Plantation

St. Elizabeth Catholic Church (Paincourtville, Louisiana)

Beat (acoustics)

St. Emma