What CapeSym does

CapeSym, Inc. is a privately held US materials science company founded in 1992 as Cape Simulations and headquartered in Natick, Massachusetts. The company develops and manufactures novel scintillator and semiconductor radiation detection materials, detector modules, and integrated detector systems used for nuclear detection, gamma spectroscopy, and radiation monitoring. Its core commercial offering is the ScintiClear line of strontium-iodide (SrI2(Eu)) gamma detectors with light output near 90,000 ph/MeV and energy resolutions reaching 2.9% at 662 keV, supplemented by CLYC(Ce) and LaBr3(Ce,Sr) scintillator crystals, halide perovskite scintillators (including CsPbBr3), and semiconductor detectors (TlBr, CdZnTe). CapeSym operates a 20,000 sq. ft. facility equipped with Bridgman, Czochralski, Float Zone, and Travelling Heater Method crystal-growth furnaces, and currently produces crystals as large as 4 inches in diameter and 12 inches tall with a stated roadmap to 6-inch diameter.

The company generates revenue through four streams: (1) hardware sales of encapsulated crystals and packaged detector cores in 1", 1.5", and 2" diameters plus Developer's Kits; (2) one-time licensing of its SYMMIC thermal analysis software; (3) professional services consulting in crystal growth, thermal management, and materials characterization that has supported more than 70 companies; and (4) R&D contract work for US government agencies including NIH, DoE, DTRA, CWMD, DHS, NASA, USAF, and MDA. Pricing is quote-based and tailored to customer specifications under multi-year contracts, with sales executed through a direct enterprise field motion. The customer base spans security, defense, medical and scientific imaging, and emerging applications such as satellite and drone-mounted radiation detection. All commercial production is conducted in the USA under ISO 9001:2015 certification.

CapeSym commercializes detector technology originally developed at US government laboratories and has industrial processes that deliver warrantied energy resolution of 3.3% at 2-inch diameters — a performance consistency benchmark the company highlights as a key differentiator versus laboratory-only SrI2 producers. The technical team includes more than 10 PhDs across crystal growth, solid-state physics, analytical chemistry, materials science, thermo-fluid transport, and engineering design. Founder and President Shariar Motakef leads the organization, which remains privately held without disclosed external venture investors and has not pursued an IPO or acquisition event to date.

Name

CapeSym

Legal name

CapeSym, Inc.

Website

https://capesym.com

Company type

Private

Founded year

1992

Operating status

Operating

Headcount range

1–10 employees

Short description

CapeSym is a privately held US materials science company that develops and manufactures scintillator and semiconductor radiation detectors, crystal growth services, and SYMMIC thermal analysis software for nuclear detection, defense, medical imaging, and space applications.

Ownership category

akta.pro rank

Product category

Radiation Detection Equipment

NAICS

Analytical Laboratory Instrument Manufacturing (334516), Irradiation Apparatus Manufacturing (334517)

SIC

Laboratory Analytical Instruments (3826), X-Ray Apparatus & Tubes & Related Irradiation Apparatus (3844)

akta.pro primary industry

Radiation Detection Instruments & Systems (Portal monitors, spectrometers, contamination monitors) (EUAKAIAK)

akta.pro secondary industries

Nuclear Materials Testing, Assay & Characterization Services (NDA/NDE, radiochemistry, materials analysis) (EUAKAIAL), Nonproliferation Technology & Detection (radiation portal monitors, RPMs, spectroscopy, forensics) (EUAKAJAG)

Keywords

• Radiation detection systems
• Scintillator crystals
• Semiconductor detectors
• Gamma spectroscopy
• Nuclear detection

Headquarters

HQ city

Natick

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Technology or R&D, Infrastructure, Supply Chain

Revenue model

1. Detector Products: Sale of ScintiClear gamma detectors, encapsulated crystals, and packaged detector cores in multiple sizes. Also includes Developer's Kits with PMT, high voltage, and MCA components.
2. SYMMIC Software: Sale of SYMMIC thermal analysis software for materials characterization and engineering analysis.
3. Consulting Services: Materials characterization and engineering consulting services supporting companies in thermal management, crystal growth, advanced materials technologies, biomedical devices, and industrial equipment design and fabrication. Has supported more than 70 companies.
4. R&D Government Contracts: Research and development services supporting US government agencies including NIH, DoE, DTRA, CWMD, DHS, NASA, and MDA missions.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

CapeSym manufactures and sells ScintiClear gamma radiation detectors based on strontium-iodide scintillator technology with warrantied energy resolution of 3.3% in 2-inch diameters. The company also produces a portfolio of scintillator crystals (SrI2(Eu), CLYC(Ce), LaBr3(Ce,Sr), perovskites) and semiconductor detectors (CsPbBr3, TlBr, CdZnTe), along with the SYMMIC thermal analysis software, supporting nuclear detection, medical imaging, and satellite radiation monitoring applications.

Product overview

CapeSym offers a portfolio of radiation detection products centered on ScintiClear gamma detectors (available as SiPM, Standard PMT, Compact PMT, Compact Spectrometer, and Developer's Kit variants) and detector cores in 1", 1.5", and 2" diameters. The company also manufactures scintillator crystals (SrI2(Eu), CLYC(Ce), LaBr3(Ce,Sr), and Perovskite) and semiconductor detectors (CsPbBr3, TlBr, CdZnTe) for nuclear detection applications. SYMMIC thermal analysis software provides simulation capabilities for crystal growth and materials processing.

Differentiator

Problem solved

Functional benefit

Brands

• ScintiClear: Scintillator gamma detectors with light output near 90,000 ph/MeV and energy resolutions reaching 2.9% at 662 keV, based on strontium-iodide technology. Offered as encapsulated crystals or packaged detector cores in 1", 1.5" and 2" diameters.
• Scinticlear
• SYMMIC

Products and services

• ScintiClear Gamma Detectors Gamma radiation detectors based on strontium-iodide scintillator technology with light output near 90,000 ph/MeV and energy resolutions reaching 2.9% at 662 keV, warrantied at 3.3% ER even in 2-inch diameters and essentially free of internal radioactivity. Offered as encapsulated crystals or packaged detector cores in 1", 1.5", and 2" diameters, available in SiPM, Standard PMT, Compact PMT, and Compact Spectrometer configurations. For government agencies, security integrators, and commercial entities performing unambiguous radioactive material identification.
• ScintiClear Developer's Kit Plug-and-play solution with PMT, high voltage supply, and Multi-Channel Analyzer (MCA) enabling rapid integration of ScintiClear detectors for development and evaluation. Designed for R&D teams integrating gamma detection systems.
• SrI2(Eu) Scintillator Crystals Strontium-iodide scintillator crystals doped with europium, offering high energy resolution for nuclear detection applications. For nuclear detection and radiation monitoring researchers and integrators.
• CLYC(Ce) Scintillator Crystals Cesium Lithium Yttrium Chloride scintillator crystals doped with cerium, used for dual gamma-neutron detection applications. For radiation detection system integrators requiring simultaneous gamma and neutron identification.
• LaBr3(Ce,Sr) Scintillator Crystals Lanthanum bromide scintillator crystals doped with cerium and strontium for nuclear detection applications. For radiation detection system integrators.
• Perovskite Scintillators Halide perovskite-based scintillator materials for radiation detection applications. For next-generation radiation detection system developers.
• CsPbBr3 Semiconductor Detectors Cesium lead bromide perovskite semiconductor radiation detectors for X-ray and gamma detection. For medical imaging, security, and scientific instrumentation integrators.
• TlBr Semiconductor Detectors Thallium bromide semiconductor radiation detectors for room-temperature X-ray and gamma detection. For medical imaging and scientific instrumentation integrators.
• CdZnTe Semiconductor Detectors Cadmium Zinc Telluride semiconductor detectors for X-ray and gamma radiation detection. For medical imaging, security, and scientific instrumentation integrators.
• SYMMIC Thermal Analysis Software Thermal analysis software for simulation and modeling of heat transfer in materials processing and crystal growth. Sold under a one-time license to companies requiring advanced materials characterization and engineering analysis.

Quantifiable outcome

• Light output near 90,000 ph/MeV
• +4 more outcomes

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature8 records

Scale indicators5 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Mirion Technologies: Largest publicly listed radiation detection and nuclear measurement company, offering scintillation detectors, spectroscopy systems, and portal monitors across defense, medical, and industrial markets. Directly comparable to CapeSym's ScintiClear product line but at far greater scale and with a broader portfolio.
• AMETEK (ORTEC): AMETEK's ORTEC division manufactures nuclear instrumentation including HPGe, scintillation, and Si detectors for spectroscopy, safeguards, and physics research. Comparable as a broad incumbent serving similar radiation detection end markets with deeper product breadth.
• Luxium Solutions (formerly Saint-Gobain Crystals): Global supplier of scintillation crystals (NaI, LaBr3, CLYC, SrI2) and detection assemblies for nuclear medicine, security, and oil & gas. A broad incumbent competing with CapeSym on scintillator crystal supply and packaged detector products.

Direct peers

• Kromek Group: UK-based developer of cadmium zinc telluride (CZT) and other radiation detection technologies for medical imaging, security screening, and nuclear detection. A direct peer in compact high-resolution gamma detection with comparable scintillator/semiconductor product positioning.
• Radiation Monitoring Devices (RMD): Subsidiary of Dynasil that develops scintillators (including CLYC, SrI2), CZT semiconductors, and neutron/gamma detectors for medical imaging, homeland security, and nuclear safeguards. Most direct comparable to CapeSym in crystal growth and detector module product overlap.
• Berkeley Nucleonics: Manufactures radiation detection and measurement instruments including portable spectrometers, isotope identifiers, and nuclear instrumentation for security, medical, and research markets. Directly comparable as a mid-sized peer serving similar end-customers.
• Scionix Holland: Manufacturer of organic and inorganic scintillation detectors and assemblies for radiation monitoring, medical imaging, and physics research. Directly comparable as a specialty scintillator/detector peer with similar product mix.
• Crytur: Czech crystal-growth specialist producing scintillation crystals (including CeBr3, CLLB, and others) and custom detector solutions for nuclear medicine, security, and scientific applications. Comparable to CapeSym's core scintillator crystal manufacturing capabilities.
• ZRF Ritec: Latvian/Russian developer of scintillation detectors, SiC semiconductor detectors, and spectrometers for radiation monitoring and physics research. A regional direct peer with overlapping scintillator and detector module offerings.

Emerging players

• H3D: Ann Arbor-based developer of high-resolution gamma-ray imaging spectrometers based on CZT and other room-temperature detectors for homeland security and nuclear safeguards. Comparable as an emerging direct peer in compact high-resolution gamma detection.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds5 records

Investors2 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about CapeSym