Cesium iodide (HCID 24601)

Overview

X-ray image intensifier

Names & identifiers

Preferred name: Cesium iodide
IUPAC: cesium iodide
English name: Cesium iodide
Molecular formula: CsI
Molecular weight: 259.81

Names & synonyms

CESIUM IODIDE7789-17-5Caesium iodideCesium iodide (CsI)Cesium monoiodideU1P3GVC56LNSC-15199DTXSID3064859RefChem:124640DTXCID9048063232-145-2Cesiumiodide

Show more names

CESIUM IODINECesium iodide, 99.9%, for analysisCaesiumiodideCesiumIodideGrCaesium lodidecesiummonoiodidedicesiumdiiodideCESIUM IODIDE AR

Dicesium diiodidecesium;iodideTricesium triiodideCesium iodide (Cs2I2)Cesium iodide (Cs3I3)UNII-U1P3GVC56LEINECS 232-145-2MFCD00010962

Database identifiers

CAS: 7789-17-5
PubChem CID: 24601
DTXSID: DTXSID3064859
UNII: U1P3GVC56L
EC Number: 232-145-2
Nikkaji: J43.757C

Properties

Computed structural properties

Topological polar surface area: 0 Å²
Hydrogen bond donors: 0
Hydrogen bond acceptors: 1
Rotatable bonds: 0
Heavy atoms: 2
Formal charge: 0
Complexity: 2

Experimental & physicochemical properties

Chemical ClassesMetals -> Metals, Inorganic Compounds

SpringerMaterials Propertiesdielectric constant

Density4.51 @25 °C

Boiling Point1280 °C @760 [mm Hg]

Melting Point632 °C

Physical DescriptionDeliquescent solid; [Merck Index] White hygroscopic solid; Odorless; [Alfa Aesar MSDS]

Physicochemical properties

Melting point: 626 °C · 626 °C (lit.)
Boiling point: 1280 °C · 1280 °C
Density: 4.51 g/mL · 4.51 g/mL at 25 °C (lit.)
refractive index: 1.7876 · 1.7876
Flash point: 1280 °C · 1280°C
storage temp.: Keep in dark place,Inert atmosphere,Room temperature
solubility: soluble in ethanol, methanol, acetone
form: beads
Specific Gravity: 4.51 · 4.51
color: White
PH: pH(50g/l, 25℃) : 5.0～9.0
Water Solubility: 74 g/100 · 74 g/100 mL (20 ºC)
Specific Heat Capacity: 0.2 J/ · Cp(crystal): 0.2 J/(g·K), at 25℃
Sensitive: Hygroscopic
Merck: 14 · 14,2014
Dielectric constant: 5.6 · 5.6(Ambient)
Stability: Stable. Deliquescent.
Major Application: cleaning productscosmeticsflavors and fragrancesfood and beveragespersonal care
InChI: 1S/Cs.HI/h;1H/q+1;/p-1
InChIKey: XQPRBTXUXXVTKB-UHFFFAOYSA-M
SMILES: [I-].[Cs+]
CAS DataBase Reference: 7789 · 7789-17-5(CAS DataBase Reference)
EWG's Food Scores: 1 · 1
FDA UNII: 1 P3GVC56L · U1P3GVC56L
NIST Chemistry Reference: Cesium iodide(7789-17-5)
EPA Substance Registry System: Cesium iodide (CsI) (7789-17-5)
UNSPSC Code: 41116107 · 41116107
NACRES: 24 · NA.24
Symbol(GHS): 8 · GHS08,GHS09
Signal word: Warning
Hazard statements: 361 fd-H400 · H361fd-H400
Precautionary statements: 201 · P201-P202-P273-P280-P308+P313-P391
PPE: 95 · dust mask type N95 (US), Eyeshields, Faceshields, Gloves
Hazard Codes: Xn,Xi
Risk Statements: 36 · 36/37/38-42/43-43
Safety Statements: 22 · 22-36/37-45
RIDADR: 3077 · UN 3077 9 / PGIII
WGK Germany: 2 · 2
RTECS: 350000 · FL0350000
F: 8 · 8
TSCA: TSCA listed
HazardClass: 9 · 9
HS Code: 28276000 · 28276000
Storage Class: 13 · 13 - Non Combustible Solids
Hazard Classifications: 1 Repr · Aquatic Acute 1Repr. 2
Toxicity: 50 i.p · LD50 i.p. in rats: 1.4 g/kg (Cochran)
REACH Registrations: Active
Limited Quantities: 5 L · 5.0 L (1.3 gallons) (liquid) or 5.0 kg (11 lbs) (solid)
Excepted Quantities: Max Inner Pack (30g or 30ml) and Max Outer Pack (1Kg or 1L)

Safety & regulation

GHS classification

GHS Classification · 5 items

This chemical does not meet GHS hazard criteria for 33% (30 of 91) of reports.

Warning

H315 (48.4%): Causes skin irritation [Warning Skin corrosion/irritation]

P261, P264, P264+P265, P271, P272, P273, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P333+P317, P337+P317, P362+P364, P391, P403+P233, P405, and P501 (click each P-code to see the statement)

Aggregated GHS information provided per 91 reports by companies from 10 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.

Hazard information

Regulatory Information · 3 items

Chemical: Cesium iodide (CsI)

Status: Active Update: 16-05-2023 https://echa.europa.eu/registration-dossier/-/registered-dossier/12840

Caesium iodide: Does not have an individual approval but may be used under an appropriate group standard

Other Safety InformationEvaluation - Cesium salts

Hazards SummaryA skin and strong eye irritant; May cause skin sensitization; Harmful by ingestion; [Alfa Aesar MSDS] See Cesium. See Iodine for the TLV of Iodides.

Hazard Classes and CategoriesSkin Irrit. 2 (48.4%)

Safety & protection

Threshold Limit Values (TLV)0.01 [ppm], inhalable fraction and vapor (iodides)

Protective Action Criteria (PAC) · 3 items

7.2 [mg/m3]

79 [mg/m3]

470 [mg/m3]

Toxicology

Adverse EffectsSkin Sensitizer - An agent that can induce an allergic reaction in the skin.

Safety data

F: 8
PPE: dust mask type N95 (US), Eyeshields, Faceshields, Gloves
wgk: 2
tsca: TSCA listed
rtecs: FL0350000
ridadr: UN 3077 9 / PGIII
hs_code: 28276000
Toxicity: LD50 i.p. in rats: 1.4 g/kg (Cochran)
risk_code: 36/37/38-42/43-43
Signal word: Warning
Symbol(GHS): GHS08,GHS09
hazard_code: Xn,Xi
safety_code: 22-36/37-45
hazard_class: 9
Storage Class: 13 - Non Combustible Solids
Hazard statements: H361fd-H400
Limited Quantities: 5.0 L (1.3 gallons) (liquid) or 5.0 kg (11 lbs) (solid)
Excepted Quantities: Max Inner Pack (30g or 30ml) and Max Outer Pack (1Kg or 1L)
REACH Registrations: Active
Hazard Classifications: Aquatic Acute 1Repr. 2
Precautionary statements: P201-P202-P273-P280-P308+P313-P391

Chemistry & industry

Uses & manufacturing

UsesUsed in prisms for infrared spectroscopy, x-ray fluorescent screens, and scintillation counters; [Merck Index]

General Manufacturing InformationCesium iodide (CsI): ACTIVE

Applications · 5 items

DescriptionCesium iodide is a soft material and extremely hygroscopic. Cesium iodide scintillators have been used extensively for indirect x-ray imaging detectors, such as for CT examinations. Cesium iodide is also used to construct electromagnetic shower detector for the CLEO II experiment, which investigates electron-positron annihilation at center-of-mass energies near 10 GeV. Cesium iodide is useful for beam splitters for Far IR spectrophotometers and IR transmission windows.

UsesPrisms for infrared spectroscopy; in x-ray fluorescent screens, scintillation counters.

UsesCesium iodide (CsI) is a kind of ionic compound that has been widely used as scintillators in many areas such as X-ray image intensifier tubes, photocathodes, and display devices. Cesium iodide is used in scintillation counters(Geiger counters) to measure levels of external radiation. It is also useful as a "getter" to remove air molecules remaining in vacuum tubes. Cesium Iodide is a material with high γ-ray stopping power due to its relative high density and atomic number. For scintillation counting, it is used either in its un-doped form or doped with sodium or thallium. CsI is resistant to thermal and mechanical shock. The physical characteristics of CsI are independent of the activator used. Compared to NaI(Tl), it is relatively soft and plastic, and does not cleave. Because it has no cleavage plane, it is quite rugged-which makes it well-suited for well logging, space research or other applications where severe shock conditions are encountered.

UsesCesium iodide is used in FT-IR (Fourier Transform Infrared Spectrometers) as a beamsplitter. Cesium Iodide exhibits high gamma-ray stopping power. Useful as input phosphor in fluoroscopy equipment, and efficient photocathode for extreme ultraviolet wavelengths. Fast and dense scintillating material - useful in electromagnetic calorimetry in particle physics.

General DescriptionCesium iodide is a simple ionic salt. It has the capacity to undergo second order transformation from cubic B2 structure to body-centered tetragonal structure at low pressures. It is mostly used as input screens of X-ray image intensifiers.