Linear Formula:


MDL Number:


EC No.:



Thallium doped Cesium Iodide Crystal
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Thallium doped Cesium Iodide Wafer
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Cesium Iodide, activated by Thallium Properties (Theoretical)

Compound Formula CsI:Tl
Molecular Weight N/A
Appearance Crystalline solid, wafer, disc, window
Melting Point 621°C
Boiling Point 1280 °C
Density 4.51 g/cm3 (25 °C)
Solubility in H2O ~670 g/l (20 °C)
Crystal Phase / Structure BCC
Specific Heat 0.048 J/kg·K
Thermal Conductivity 1.13 at 298K W/m·K
Young's Modulus 5.3 GPa

Cesium Iodide, activated by Thallium Health & Safety Information

Signal Word Warning
Hazard Statements H302+H332-H315-H317-H319-H335
Hazard Codes Xn, Xi, N
Precautionary Statements P201-P261-P264-P270-P271-P272-P273-P280-P304+P340-305+P351+P338-P330-P332+P313-P333+P313-P337+P313-P362-P363-P391-P403+P233-P405-P501
Risk Codes R20/22-62 R36/37/38 R43 R50
Safety Statements N/A
Transport Information UN3077 9/PG III
GHS Pictograms

About Cesium Iodide, activated by Thallium

Iodide IonCesium Iodide, actived by Thallium (Thallium doped Cesium Iodide, or CsI:Tl) is a scintillation crystal material with high absorption power used in gamma ray absorbtion. American Elements produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia) and follows applicable ASTM testing standards. Typical and custom packaging is available, as is additional research, technical and safety (MSDS) data.

Cesium Iodide, activated by Thallium Synonyms

Tl:CsI, CsI:Tl, CsI(Tl), CsI(Tl) Scintillation Crystal, Thallium : Cesium Iodide, Thallium doped cesium iodide, Thallium-doped cesium iodide, CsITl, CsI-Tl

Chemical Identifiers

Linear Formula CsI:Tl
MDL Number N/A
EC No. N/A

Packaging Specifications

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Shipping documentation includes a Certificate of Analysis and Safety Data Sheet (SDS). Solutions are packaged in polypropylene, plastic or glass jars up to palletized 440 gallon liquid totes, and 36,000 lb. tanker trucks.

Related Elements


See more Cesium products. Cesium (or Caesium) (atomic symbol: Ce, atomic number: 55) is a Block S, Group 1, Period 6 element with an atomic weight of 132.9054519. The number of electrons in each of Cesium's shells is 2, 8, 18, 18, 8, 1 and its electron configuration is [Xe]6s1. Cesium Bohr ModelThe cesium atom has a radius of 265 pm and a Van der Waals radius of 343 pm. Cesium is a member of the alkali group of metals. It is one of three metals that occur as a liquid at room temperature, the others being mercury and gallium. Elemental CesiumCesium's main commercial source is pollucite ore; however, it is also found in beryl, avogadrite, pezzottaite, and londonite. Cesium was discovered by Robert Bunsen and Gustav Kirchhoff in 1860 and first isolated by Carl Setterberg in 1882. In its elemental form, cesium has a silvery gold appearance. The word Cesium originates from the Latin word "caesius," meaning "sky blue," which refers to the vibrant blue lines in its spectrum.


See more Iodine products. Iodine (atomic symbol: I, atomic number: 53) is a Block P, Group 17, Period 5 element with an atomic radius of 126.90447. The number of electrons in each of Iodine's shells is 2, 8, 18, 18, 7 and its electron configuration is [Kr] 4d10 5s2 5p5. The iodine atom has a radius of 140 pm and a Van der Waals radius of 198 pm. In its elemental form, iodine has a lustrous metallic gray appearance as a solid and a violet appearance as a gas or liquid solution. Elemental IodineIodine forms compounds with many elements, but is less active than the other halogens. It dissolves readily in chloroform, carbon tetrachloride, or carbon disulfide. Iodine compounds are important in organic chemistry and very useful in the field of medicine. Iodine was discovered and first isolated by Bernard Courtois in 1811. The name Iodine is derived from the Greek word "iodes" meaning violet.


See more Thallium products. Thallium (atomic symbol: Tl, atomic number: 81) is a Block P, Group 13, Period 6 element with an atomic weight of 204.38. Thallium Bohr ModelThe number of electrons in each of thallium's shells is 2, 8, 18, 32, 18, 3 and its electron configuration is [Xe] 4f14 5d10 6s2 6p1. The thallium atom has a radius of 170 pm and a Van der Waals radius of 196 pm. Thallium was discovered by Sir William Crookes in 1861 and first isolated by Claude-Auguste Lamy in 1862. Thallium is a post-transition metal that is not found free in nature. Thallium is primarily used for its electrical conductivity as thallium sulfide, which changes with exposure to infrared light. This ability makes the compound useful in photocells. Elemental ThalliumThallium bromide-iodide crystals have been used as infrared optical materials. Thallium has also been used with sulfur, selenium or arsenic to produce low melting glasses which become fluid between 125 and 150 °C, while thallium oxide has been used to produce glasses with a high index of refraction, and is also used in the manufacture of photo cells. Its name is derived from the Greek word thallos, which means twig or green shoot.


September 28, 2023
Los Angeles, CA
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