Product Overview
Liquid Krypton is the cryogenic liquid form of the noble gas krypton (Kr), obtained through the fractional distillation of liquefied air. As a rare and dense cryogenic fluid, Liquid Krypton possesses unique properties-including high density, high scintillation light yield, and good charge transport-that make it a specialized medium for high-energy physics research and certain niche technological applications. The availability of high-purity Liquid Krypton is crucial for experiments requiring specific detection characteristics.
Basic Information
| CAS No. | 7439-90-9 |
| UN No. | UN 1970 (Krypton, refrigerated liquid) |
Key Attributes & Parameters
| Purity | Typically ≥ 99.995% (4.5N grade), with customized higher purities available. Key impurities like xenon and hydrocarbons are tightly controlled. |
| Boiling Point | -153.4 °C (-244.1 °F) at atmospheric pressure. |
| Density | ~2.41 g/mL at its boiling point. |
| Appearance | Colorless, transparent cryogenic liquid. |
| Scintillation Wavelength | Peak at ~150 nm (vacuum ultraviolet), with a short decay time. |
Features & Advantages
Cost-Effective Alternative for Certain Applications
Compared to xenon, Liquid Krypton offers a more economical option for large-volume detectors where its specific properties are advantageous, such as in calorimetry.
Fast Scintillation Response
Its short scintillation decay time is beneficial for applications requiring precise timing and high event-rate capabilities.
High Density for Compact Detectors
Provides good stopping power in a relatively compact volume, useful in particle physics calorimeters.
Good Ionization Yield
Facilitates the collection of ionization charge, supporting dual-phase detection techniques.
Functional Characteristics
In particle detection systems, Liquid Krypton functions primarily as an active scintillating medium. When ionizing radiation passes through it, ultraviolet scintillation photons are emitted. In specialized configurations like liquid krypton ionization chambers or calorimeters, the ionization electrons produced are also collected via an applied electric field. This allows for simultaneous measurement of scintillation light and charge, enabling precise energy deposition measurements and, in some designs, spatial resolution.
Primary Application Fields
High-Energy Physics (HEP)
Historically and currently used as the active medium in electromagnetic calorimeters for particle physics experiments (e.g., the NA48, KLOE, and future experiments) to measure the energy of photons and electrons with high precision.
Nuclear Physics Research
Employed in specialized detection systems for studying particle interactions and properties.
Fundamental Science
Potential use in rare-event searches where its specific scintillation and ionization properties are being investigated.
Aerospace & Lasers
Gaseous krypton has major applications; the liquid form is relevant in production, storage, and certain laser technologies.
Customer Collaboration Case
We supplied ultra-high-purity Liquid Krypton for a renowned international research consortium's particle physics experiment upgrade. Their electromagnetic calorimeter required several tons of Liquid Krypton to achieve superior energy resolution for photons. The challenge involved ensuring extreme purity (particularly low levels of electronegative impurities like oxygen and water) to maintain excellent charge collection efficiency over the detector's lifetime. Our team implemented a dedicated purification cycle and stringent on-site filling protocol with real-time purity monitoring. The consistent quality and reliable supply of the Liquid Krypton were vital for the successful commissioning of the calorimeter, which now operates with design performance, contributing to high-precision measurements in frontier physics research.
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