Thallium(I) iodide
Thallium(I) iodide (TlI), CAS number 7790-30-9, is an inorganic compound with a molecular weight of 331.29 g/mol. Available as a powder, this thallium salt is supplied by Tech Serve Solutions at a 99.999% trace metals basis purity. Its unique properties lend it to specialised applications within materials science and research, particularly where precise elemental composition is critical.

Scintillation Detectors
Thallium-doped thallium iodide (CsI(Tl)) is a widely recognised scintillator material. It efficiently converts ionising radiation into light, making it valuable for detecting gamma rays and X-rays in various scientific and medical imaging applications.
Infrared Optics
Due to its transparency in the infrared spectrum, thallium(I) iodide can be used in optical components such as windows and prisms for infrared spectroscopy and thermal imaging systems.
Materials Science Research
As a high-purity inorganic compound, TlI serves as a research chemical for exploring novel materials and investigating solid-state physics phenomena, including crystallography and semiconductor properties.
| Molecular weight | 331.29 |
|---|---|
| Linear formula | TlI |
| Assay | 99.999% trace metals basis |
| Form | powder |
| Density | 7.29 g/mL at 25 °C(lit.) |
| Melting point | 440 °C(lit.) |



Hazard statements
- H300Fatal if swallowed
- H330Fatal if inhaled
- H373May cause damage to organs through prolonged exposure
- H411Toxic to aquatic life with long-lasting effects
Precautionary statements
- P260Do not breathe dust, fume, gas, mist, vapours or spray
- P264Wash thoroughly after handling
- P273Avoid release to the environment
- P284Wear respiratory protection
- P301IF SWALLOWED
- P310Immediately call a POISON CENTER or doctor
| Transport (UN / ADR) | UN 1707 6.1 / PGII |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | T+,N |
| Risk statements (R) | 26/28-33-51/53 |
| Safety statements (S) | 13-28-45-61 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Thallium(I) iodide used for?
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Thallium(I) iodide (TlI) is primarily utilised in scintillation detectors for radiation detection and in optical components for infrared applications. It is also employed as a research chemical in materials science.
What is the CAS number and formula for Thallium(I) iodide?
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The CAS number for Thallium(I) iodide is 7790-30-9, and its chemical formula is TlI.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Thallium(I) iodide with an assay of 99.999% on a trace metals basis. We do not represent this product as USP, BP, or EP grade.
How should Thallium(I) iodide be handled?
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Thallium(I) iodide is highly toxic if swallowed or inhaled and may cause long-term health effects. It is also toxic to aquatic life with long-lasting effects. Handle with extreme caution in a well-ventilated area, wearing appropriate personal protective equipment, including respiratory protection. Avoid release into the environment. Refer to the Safety Data Sheet for comprehensive handling instructions.
Is Thallium(I) iodide a controlled substance?
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While specific regulations vary by jurisdiction, thallium compounds are generally subject to strict controls due to their high toxicity. Please consult your local regulations regarding the possession and use of Thallium(I) iodide.
How is Thallium(I) iodide packed and shipped?
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Thallium(I) iodide is packed and shipped in compliance with UN 1707, Class 6.1, Packing Group II regulations for hazardous materials. TSS ensures all shipments adhere to international transport standards.
How can I request a quote or sample?
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To request a quote or a sample of Thallium(I) iodide, please contact the Tech Serve Solutions sales department through our website or by phone, providing your specific requirements.
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