Liquid Nitrogen Dewar for Germanium Detector – Union Carbide LR31 Used

Liquid Nitrogen Dewar for Germanium Detector – Union Carbide LR31 Cryogenic Tank LN2 Dewar

Condition: Used in good and clean condition for an older unit. It was used with a Germanium Detector, so cap is not included. There are no rattles or any other sounds of movement when the Dewar is turned upside down.

Product Overview

The Union Carbide LR31 is a specialized cryogenic tank designed for storing and handling liquid nitrogen, particularly for use with germanium detectors. This high-quality dewar offers reliable performance for laboratory and research applications in gamma-ray spectroscopy and related fields.

Key Features

• Specifically designed for use with germanium detectors
• Manufactured by Union Carbide, a trusted name in cryogenic equipment
• Double-walled construction with vacuum insulation for optimal thermal efficiency
• Likely constructed from durable, lightweight aluminum alloy
• Superior vacuum performance for low liquid nitrogen consumption
• Portable design for easy transportation within laboratory settings

Applications

Ideal for:

• Scientific research laboratories

Union Carbide LR31 Liquid Nitrogen Dewar for Germanium Detectors – FAQ

What is a Liquid Nitrogen Dewar?

A liquid nitrogen dewar is a specialized type of vacuum flask used for storing cryogenic liquids such as liquid nitrogen. It is designed to maintain extremely low temperatures by providing excellent thermal insulation.

How does the Union Carbide LR31 Dewar work?

The Union Carbide LR31 Dewar works by maintaining a high vacuum between its inner and outer walls, which significantly reduces heat transfer. This allows the liquid nitrogen inside to remain at a very low temperature, typically around 77 K (-196°C), for an extended period.

Why is liquid nitrogen used with Germanium Detectors?

Liquid nitrogen is used to cool Germanium Detectors because it reduces thermal noise, which can interfere with the detector’s ability to accurately measure radiation. Cooling the detector to cryogenic temperatures improves its energy resolution and overall performance.

What are the safety precautions for handling liquid nitrogen dewars?

Handling liquid nitrogen requires careful safety precautions due to its extremely low temperature. Users should wear cryogenic protective gear, including gloves and face shields, to prevent frostbite and other injuries. Dewars should be stored in well-ventilated areas to avoid the risk of asphyxiation from nitrogen gas buildup.

What are the main components of a cryogenic dewar?

A cryogenic dewar typically consists of an inner vessel made of stainless steel, an outer vessel made of carbon steel, and a high vacuum space between them filled with insulating materials such as perlite. Some dewars also include safety valves to release excess pressure.

How should I fill the Union Carbide LR31 Dewar with liquid nitrogen?

To fill the dewar, ensure that the vent tube and fill tube are open and free of obstructions. Use a funnel and a short piece of tubing to carefully pour liquid nitrogen into the dewar. Avoid direct contact with the cryostat and detector to prevent damage from rapid temperature changes.

What are the applications of the Union Carbide LR31 Dewar?

This dewar is ideal for applications requiring precise temperature control, such as gamma-ray spectroscopy with Germanium Detectors. It is also used in various scientific and industrial settings where cryogenic cooling is essential.

How do I maintain the Union Carbide LR31 Dewar?

Regular maintenance involves checking the vacuum integrity, ensuring that safety valves are functioning correctly, and inspecting for any signs of wear or damage. Proper storage and handling will extend the dewar’s lifespan and ensure safe operation.

What should I do if the Germanium Detector warms up?

If the detector warms up, allow it to reach room temperature before refilling the dewar with liquid nitrogen. Ensure no voltage is applied during this process to avoid damage. Follow the manufacturer’s guidelines for recooling the detector.

About Union Carbide Corporation

History and Formation

Union Carbide Corporation, originally known as Union Carbide & Carbon Corporation, was formally incorporated on November 1, 1917. The company was formed through the acquisition of several key businesses, including Linde Air Products Co., National Carbon Co., Inc., and Prest-O-Lite. These acquisitions laid the foundation for Union Carbide’s future growth and diversification into various industries.

Innovations and Contributions

Union Carbide has been a pioneer in the development and manufacture of numerous industrial and chemical products. The company played a significant role in the production of ethylene and its derivatives, which are essential in the manufacture of plastics and synthetic rubber. During World War II, Union Carbide’s expertise in scaling laboratory operations to full-scale production was invaluable in the manufacture of butadiene and polyethylene, critical components for synthetic rubber and high-frequency cable insulation.

Product Range and Expansion

By the mid-20th century, Union Carbide had expanded its product range to include electronic components, cryogenics, metals, and various types of plastics. The acquisition of the Bakelite Corporation in 1939 added phenolic resins to its portfolio, further solidifying its position in the plastics industry. The company also developed the high-pressure process for polyethylene production, which became one of its major successes post-war.

Global Presence

At its peak, Union Carbide operated over 400 plants in North America and had affiliated companies worldwide. Its global reach and extensive product range made it a dominant player in the chemical and materials industries. In the UK, Union Carbide’s plastics interests were merged with those of the Distillers Company to form Bakelite Xylonite Ltd., which employed thousands of people and produced a wide range of plastic products.

Challenges and Legacy

Despite its many successes, Union Carbide faced significant challenges, including the tragic Bhopal disaster in 1984, where a methyl isocyanate gas leak resulted in thousands of deaths and injuries. This incident severely impacted the company’s reputation and financial stability. Over the following years, Union Carbide sold off many of its businesses to meet its liabilities. In 2001, the company was acquired by The Dow Chemical Company, marking the end of its independent operations.

Continued Impact

Today, the legacy of Union Carbide continues through its contributions to the chemical and materials industries. The technologies and products developed by Union Carbide, including the LR31 Liquid Nitrogen Dewar, remain integral to various scientific and industrial applications. The company’s history of innovation and resilience continues to inspire advancements in these fields.