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Lithium Polyethylene

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Gamma-sensitive radiation detectors used in the vicinity of reactors or other neutron sources must be shielded from capture-gamma rays. These gammas arise from capture of thermal neutrons by surrounding materials or by the detecting crystal itself. Use of borated polyethylene as a shield can attenuate the neutron flux, but the neutrons captured by the boron will result in a 0.42 MeV gamma ray and will therefore not completely eliminate the gamma background.
7.5% Lithium-Polyethylene is very effective in reducing gammas because it produces no capture gammas. Thus, when used to shield a gamma detector from neutrons, it eliminates the usual capture-gamma background. It should be noted that due to its lower capture cross-section, lithium is less effective than boron for capturing thermal neutrons and therefore requires a greater thickness than borated polyethylene.

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About us

John Caunt Scientific Ltd are a Manchester-based distributor of bespoke radiation detection equipment and health physics instrumentation, with over 40 years’ experience in the nuclear shielding industry.

Over the years, our company has gained an outstanding reputation for our overall knowledge of radiation measurement and our ability to design innovative products that are highly recommended by our clients across the country.

Here at John Caunt, we believe that they key to success within this particular industry is to strive for quality, reliability and innovation. We have a team of dedicated specialists who work closely with customers to ensure their radiation detection requirements are fulfilled as efficiently as possible. We as a company take pride in our ability to combine our knowledge and skills with the latest technologies to create new solutions that are proven to achieve excellence. We offer a distinct range of gamma spectrum core loggers, core sample gamma loggers, active extremity dosimeters, nuclear decommissioning equipment and spectrometry products.

John Caunt Scientific has understood the needs of customers for many years, and has evolved existing products as well as new ones to improve the overall detection of radiation, which is absolutely essential in a number of environments. Some of the industries we cater for include Health Physics, Oil & Gas, Defence, Nuclear Power Generation, POCO & Decommissioning and High Energy Physics. Each piece of equipment we design is built to last and will provide consistency wherever possible. Whether our clients are looking for single-channel analysers or multi-channel analysers, we at John Caunt Scientific have the perfect solution for any application.

We at John Caunt have designed multiple solutions over the years that meet the high standards and regulations set out by the industry. Some of these include;

Instruments – Gamma Monitors, Counting Equipment, Neutron Monitors.

Shielding – Neutron Shielding, Gamma Shielding.

Detectors – Scintillation Detectors.

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Articles/Press Releases

04/12/2024 - The RMS30 is a flexible & intuitive radiation detection system from JCS Nuclear Solutions
A Versatile, Intelligent, Dual Channel, Radiation Detection platform where sample time, counting period, alarm thresholds (per probe) can be defined by the operator.
27/11/2024 - Pulsed Gamma and X-ray Field Compatibility
The first in a suite of new upgrades being added to the GMSS595 is its ability to measure dose rates in pulsed gamma and X-ray fields. This breakthrough extends its applications beyond traditional gamma monitoring.
12/03/2020 - JCS announce a new Alpha/Beta Contamination Probe
We are pleased to announce the new Scionix thin Alpha/Beta SiPM Scintillation detector with a built-in temperature compensation & preamplifier.

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Company details for JCS Nuclear Solutions

JCS Nuclear Solutions