ASTM E1855

ASTM E1855 is the ASTM standard for using 2N2222A silicon bipolar transistors as neutron spectrum sensors and displacement damage monitors. It provides a technical basis for evaluating how these transistors respond under neutron exposure, helping users relate device behavior to radiation effects in a controlled way. For laboratories, test programs, and engineering teams working with radiation-sensitive electronics, this standard supports more consistent measurement and comparison.

ASTM E1855 standard overview

The official title shows that this standard focuses on a specific transistor type, the 2N2222A silicon bipolar transistor, and its use as both a neutron spectrum sensor and a displacement damage monitor. In practical terms, ASTM E1855 helps define a common method for observing radiation-induced changes in device performance. That makes it useful when test results need to be repeatable, comparable, and tied to a recognized ASTM test method rather than an informal procedure.

Where is ASTM E1855 used?

This standard is commonly used in radiation testing environments where neutron exposure must be assessed through electronic components. It is relevant to laboratories, device evaluation workflows, and engineering groups that study displacement damage effects in silicon bipolar transistors. ASTM E1855 is especially useful when a test setup needs a practical sensor or monitor to help characterize neutron-related performance changes in electronics and related qualification work.

Practical importance of ASTM E1855

ASTM E1855 matters because it supports more reliable testing and evaluation of radiation effects using a well-defined device and method. That can improve consistency in procurement, qualification, and quality control activities where neutron exposure or displacement damage is a concern. By following a recognized ASTM standard, organizations can reduce ambiguity in test results, compare data more effectively, and strengthen technical confidence in measurement and compliance decisions.

• 2N2222A silicon bipolar transistor-based testing
• Neutron spectrum sensing applications
• Displacement damage monitoring
• Repeatable radiation evaluation methods
• ASTM-aligned technical reference