# Neutron Activation Analysis (NAA) > Quantifies elements via gamma rays from irradiated samples. Source: https://covalent.com/techniques/chemical-analysis/neutron-activation-analysis-naa/ Updated: 2026-04-20T22:39:02+00:00 --- ![](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/themes/covalent/assets/images/blog-default-banner.jpg) ![](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/themes/covalent/assets/images/blog-mobile-banner.jpg) [Connect](https://covalent.com/covalent-connect/) # Neutron Activation Analysis (NAA) Neutron Activation is a sensitive technique that quantifies elements by measuring gamma rays emitted from neutron-irradiated samples. It excels at ultra-trace, multi-element analysis for solids, liquids, and powders, even when conventional methods are unsuitable. [Add to Quote](#) ## What Is Neutron Activation Analysis (NAA) ? Neutron Activation is a method for quantifying the concentration of elements in materials. Samples are irradiated with neutrons, which causes elements to form unstable radioactive isotopes. As the elements decay, they release gamma rays that are measured to identify the material’s composition. This method is helpful in detecting small amounts of material, especially in fields such as semiconductors, nanotechnology, and advanced [coatings](/applications/coating-testing/), where precision is important. At Covalent, we focus on delivering accurate results while keeping the sample prep as simple and straightforward as possible. Ultra-Trace Detection ### Ultra-Trace Detection Measures elements down to parts-per-billion levels. Multi-Element Analysis ### Multi-Element Analysis Detects and quantifies multiple elements in a single run. Matrix-Independent Accuracy ### Matrix-Independent Accuracy Provides reliable results regardless of sample composition. ## Why Use NAA? Neutron Activation is ideal when ultra-trace, multi-element quantification is needed, especially for samples that are difficult to digest or analyze by other methods. Its minimal sample preparation, matrix-independent accuracy, and high sensitivity make it well-suited for semiconductors, advanced materials, geological studies, and any application requiring precise, reliable elemental analysis. Neutron Activation is especially useful for samples—solid or liquid—that cannot be digested for ICP analysis, contain halides, or include elements like H, N, or O that are difficult to measure by standard methods. It also offers a more sensitive or cost-effective option when only a few elements need quantification, or when elements cannot be measured by ICP, such as noble or atmospheric gases. ### High Sensitivity Captures ultra-low concentrations that other techniques may miss. ### Minimal Sample Prep Works with solids, powders, and liquids with little to no preparation. ### Versatile Applications Ideal for semiconductors, advanced coatings, and geological samples. ## Covalent’s Capabilities Offer NAA for Trace Multi‑Element Analysis and Reliable Quantification [Get a Quote](https://covalent.com/get-a-quote/) ## Working Principle Instrumental Neutron Activation Analysis (INAA) works by irradiating samples with neutrons in a nuclear reactor or with a neutron generator. Irradiation which causes certain stable nuclei to capture neutrons and become radioactive isotopes. As these unstable isotopes decay, they emit characteristic gamma rays that are measured to identify and quantify the elements present in the sample. ### Equipment Used for NAA: Nuclear reactor or neutron generator and gamma ray detectors. High-speed pneumatic rabbit sample transfer is available for very short half-life nuclides, ex: 20F. Prompt gamma neutron activation for H, B, Gd and other elements. Fast neutron activation for N & O. ### Key Differentiators Neutron activation analysis requires minimal or no sample preparation and has limited sensitivity to the chemistry of the sample matrix, enabling robust quantification to trace levels in a wide variety of samples. #### Strengths - Neutron activation can give higher precision (more repeatable measurements) than most other methods. - Isotope dilution and possible qNMR are better/comparable. - Unlike SIMS and LA-ICP-MS, matched calibration standards are typically not needed. - Liquids or solids can be easily measured. #### Limitations - High boron content can cause self-shielding; He, Li, Be, C, S, Pb not measurable. - Samples may become radioactive and cannot always be returned. - Short-lived isotopes (e.g., 20F) limit sensitivity; long-lived matrix elements may require extended decay times. - Certain matrices (Na, Al, Mn) reduce accuracy; Si, C, Ca, N, H, O are preferred. - Gas samples are difficult to measure; argon detection is challenging. - Requires careful consideration of interferences and isotope half-lives. Two colleagues working together on a laptop, discussing a project in a bright, professional environment. ## Unsure Whether NAA Is Right for You? Our experts are here to help you determine if Neutron Activation Analysis is the best fit based on your material, detection limits, industry needs, and project goals. [Talk to an Expert](https://covalent.com/contact-us/) ## Sample Information Example Output Sample Requirements - Elemental composition reports showing relative concentrations of multiple elements in a single run. - Gamma-ray spectra with characteristic peaks identifying specific elements in the sample. - Detection limit tables indicating sensitivity from <1 ppb to percent-level concentrations. - Isotope-specific data highlighting ultra-trace elements in complex matrices. [https://covalent.com/wp-content/uploads/2026/01/table.png](https://covalent.com/wp-content/uploads/2026/01/table.png) Relative detection limits of elements by neutron activation analysis, from percent-levels. Elements that are not measured by neutron activation are not colored. ### What we accept: Little to no sample preparation is required, for larger solid samples they can be broken down to smaller pieces to fit in the sample container. Solids, powders and liquids can be analyzed. Please reach out to discuss if you need to analyze gas samples. ## Use Cases - Environmental Monitoring - Geological Exploration - Semiconductor Manufacturing - Metallurgy & Materials Science - Agriculture & Food Science - Medical & Biological Research - Pharmaceutical Production - ![Nuclear Magnetic Resonance Spectroscopy in Pharmaceuticals](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/uploads/2025/11/uc-environmental-applications.jpg) ### Environmental Monitoring Quantifying trace metals and pollutants in soil, water, and air particulates. - ![Geological Exploration](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/uploads/2025/11/uc-geology-and-earth-sciences.jpg) ### Geological Exploration Determining elemental composition of rocks and minerals for mining and resource assessment. - ![Semiconductor Manufacturing](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/uploads/2025/11/Semiconductor-Battery-and-Materials-Industries.jpg) ### Semiconductor Manufacturing Measuring ultra-trace metal contaminants in silicon wafers and process chemicals. - ![Metallurgy & Materials Science](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/uploads/2025/11/uc-metallurgy-and-alloy-developments.jpg) ### [Metallurgy & Materials Science](/solutions/metallurgical-analysis-and-testing/) Determining trace elements in alloys and ceramic materials for development and quality control. - ![Agriculture and Food Science](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/uploads/2025/11/uc-food-and-beverage.jpg) ### Agriculture & Food Science Analyzing nutrient and contaminant levels in crops, fertilizers, and food products. - ![Medical and Biological Research<](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/uploads/2025/11/uc-biomedical-and-life-sciences.jpg) ### Medical & Biological Research Measuring trace element concentrations in tissues and biological samples. - ![Pharmaceutical Production](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/uploads/2025/11/uc-pharmaceuticals-biomedical-devices.jpg) ### Pharmaceutical Production Verifying elemental purity and detecting contaminants in raw materials and formulations. ## Complementary Techniques - **ICP:** ICP gives precise elemental concentrations, while neutron activation confirms elemental presence based on nuclear properties. Together they provide cross validation when matrix or interference issues limit either method alone. - **Ion chromatography:**Ion chromatography separates and quantifies ionic species, giving detailed information about specific anions or cations. Neutron activation identifies elements through nuclear signatures, so the two complement each other by linking elemental composition to specific ionic forms that neutron activation cannot distinguish. - **Inert gas fusion:** Inert gas fusion measures light elements like oxygen, nitrogen, and hydrogen with high sensitivity. Neutron activation identifies elemental content through nuclear signatures, so together they cover both light gas forming elements and heavier elements that neutron activation detects more effectively. [Inductively Coupled Plasma Mass Spectrometry (ICP-MS)](https://covalent.com/techniques/chemical-analysis/inductively-coupled-plasma-mass-spectroscopy-icpms/) Measures trace elements with high accuracy. [Explore](https://covalent.com/techniques/chemical-analysis/inductively-coupled-plasma-mass-spectroscopy-icpms/) [Add to Quote](#) ## Why Choose Covalent for Your NAA Needs ? Covalent delivers precise, multi-element results with ultra-trace sensitivity, fast turnaround, and expert support, backed by advanced facilities and decades of experience across materials science, semiconductors, and regulated industries. ## Frequently Asked Questions Identifying the right test can be complex, but it doesn’t have to be complicated. Here are some questions we are frequently asked. - ### How long does the entire NAA process take, from submission to results? Typical turn around time is 1-2 weeks. - ### Can NAA distinguish between different chemical forms (speciation) of an element in a sample? NAA is only sensitive to the element and not different chemical forms. - ### Are there any regulatory or licensing requirements for clients submitting samples for NAA? There are no regulatory or licensing requirements to submit samples for NAA. Resources ![](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/themes/covalent/assets/images/resource-bg-c.svg) Resources ![](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/themes/covalent/assets/images/resource-bg-o.svg) [![Metallurgical Failure Analysis: Root Cause Investigations](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/uploads/2026/05/adobestock-1429489227-768x419.jpeg) Webinar Metallurgical Failure Analysis: Root Cause Investigations Jun 18, 2026](https://covalent.com/webinars/metallurgical-failure-analysis-root-cause-investigations/) [![What Is Aerogel Used For? Applications, Properties, and Characterization](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/uploads/2026/05/aerogel-insulation-is-used-where-768x512.jpg) Blog What Is Aerogel Used For? 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Our experts can help you determine if this approach is the best fit for your samples and discuss the next steps. [Talk to a Materials Scientist](https://covalent.com/contact-us/)