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Metals, alloys and elements

Cesium-137

Also known as 137Cs radioisotope, Cesium Cs-137, Caesium-137

CAS 10045-97-3Formula CsMolar mass 136.91 g/mol
1 supplier listed
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Element with atomic number and standard atomic weight

Key facts

What buyers check first

All properties
CAS number
10045-97-3
Formula
Cs
Molar mass
136.91 g/mol
HS code
284443
Category
Metals, alloys and elements

What is Cesium-137?

Plain description, key identifiers and synonyms

Cesium Cs 137 is a radioactive isotope of cesium with an atomic mass of 139 and potential application in radiotherapy. Cesium Cs 137 is prevalent due to its spontaneous production, which occurs as a result of nuclear fission of other radioactive materials, such as uranium and plutonium. This radionuclide has a relatively long half-life, 30 years, and decays by emitting beta particles. Both Cs 137 and its metastable nuclear isomer, barium-137m, emit gamma radiation of moderate energy and so are used in sterilization procedures in the food industry or in hospital environments.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
cesium-137
CAS number
10045-97-3 CAS number cross-checked
Molecular formula
Cs
InChIKey
TVFDJXOCXUVLDH-RNFDNDRNSA-N
InChI
InChI=1S/Cs/i1+4
Canonical SMILES
[Cs]
Isomeric SMILES
[137Cs]

Synonyms

  • 137Cs radioisotope
  • Cesium Cs-137
  • Caesium-137
  • Cesium, isotope of mass 137
  • Cesium 137
  • 137Cs
  • (137Cs)caesium
  • Cesium Cs 137
  • 137Cs isotope
  • Isotope:137Cs
  • 137Cs (isotope)
  • Cesium-137 isotope
  • Isotope:Cesium-137

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
136.91 g/molcalc.
Exact mass
136.9071 Dacalc.
LogP (octanol/water)
-0.38calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
1calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Cesium-137 suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

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  • EvitaChem
    China, BeijingUnclaimed profile
    Cesium-137Grade, purity and minimum order on request
    Price on request
    View

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Where suppliers are based

1 supplier in 1 country

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Cesium-137 price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Cesium-137 is traded under.

HS 2844.43Indicative HS code

Radioactive elements and isotopes and compounds other than those of subheading 284410…

World exports in 2024
$2.19B
+8.8% vs 2023, imports $2.53B
2022 to 2024
Top exporters
  1. Canada32.1%
  2. Netherlands17.0%
  3. Germany11.4%
Top importers
  1. United States37.8%
  2. Germany8.4%
  3. China5.8%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Cesium-137 is indicative (it is known at chapter level only). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Cesium-137, based on the data on this page

What is Cesium-137?

Cesium Cs 137 is a radioactive isotope of cesium with an atomic mass of 139 and potential application in radiotherapy. Cesium Cs 137 is prevalent due to its spontaneous production, which occurs as a result of nuclear fission of other radioactive materials, such as uranium and plutonium.

What is the CAS number of Cesium-137?

The CAS registry number of Cesium-137 is 10045-97-3.

What is the molecular formula and weight of Cesium-137?

The molecular formula of Cesium-137 is Cs and its molar mass is 136.91 g/mol.

What is Cesium-137 used for?

Known uses and roles of Cesium-137 include isotope-labelled compounds in research and laboratory.

Is Cesium-137 hazardous?

No GHS hazard classification for Cesium-137 is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Cesium-137?

Cesium-137 is usually classified under HS code 284443 (Radioactive elements and isotopes and compounds other than those of subheading 284410…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Cesium-137?

CompoundList lists 1 supplier of Cesium-137 in China. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Cesium-137?

Suppliers quote Cesium-137 on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Cesium-137

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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