MS-PC_2022 (1)

MS-PC Introduction Performance Specifications for Instrumentation Systems Designed to Measure Radon Gas in Air Introduction i Scope Summary This standard specifies minimum performance criteria and testing procedures for instruments and/or systems designed to quantify the concentration of 222 Rn gas in air. These are consistent but general performance criteria applicable to the wide variety of radon measurement devices used for indoor measurements, primarily in residential environments or buildings not associated with the possession or handling of radioactive materials. Also included is a description of documentation necessary for demonstration of compliance with this standard. This standard addresses performance criteria for radiological and environmental parameters only. This standard does not address the calibration or other quality assurance requirements for the use of the instruments and/or systems, or the measurement of other isotopes of radon such as 220 Rn and 219 Rn or progeny of any radon isotope. This standard does not address interference from isotopes of radon other than 222 Rn, grab sampling methods, mechanical and electrical issues related to the devices, or performance criteria for laboratory equipment that might be used to analyze devices, such as a gamma-ray spectroscopy system for analyzing a charcoal canister. Sampling periods of less than 1 hour in duration are explicitly excluded from consideration in this standard. Although the performance criteria could be adopted for use in a certification program, such a program is beyond the scope of this standard. Overview In 1992, the U.S. Environmental Protection Agency (EPA) published Indoor Radon and Radon Decay Product Measurement Device Protocols as guidance for devices that were to be listed in the EPA’s National Radon Proficiency Program. This EPA program was privatized in 1998. Because there remained a need for updating and improving radon measurement standards, a consensus process at the AARST Consortium on National Radon Standards was developed to promulgate a series of standards to address these issues. This standard is one in that series. The primary aim of this standard is to identify minimum performance criteria for devices or systems used for measurements of radon in indoor environments for the purpose of determining whether or not the home or building should be mitigated to reduce the radon concentration below an applicable guideline concentration. However, this standard may be useful for devices or systems for measuring radon in other circumstances. Devices that are used to measure radon for the purpose of compliance with federal or State regulations related to the possession or handling of radioactive materials may require additional or more restrictive criteria than set forth in this standard. Manufacturers and/or laboratories claiming that the device(s) they produce or use meet the requirements of this standard should maintain documentation supporting that claim; Section 8 provides a sample report template. Compliance with this standard does not constitute “certification” or “device approval,” such as from a national proficiency program. Hereafter, the term radon is used to mean specifically 222 Rn gas and thoron to mean specifically 220 Rn gas; the term radon progeny means the short-lived radioactive decay products of 222 Rn gas, and thoron progeny means the short- lived radioactive decay products of 220 Rn gas. A complementary standard, ANSI N42.50, Performance Specifications for Systems Designed to Measure Radon Progeny in Air (ANSI/IEEE N42.50), has been promulgated to address instrumentation for the measurement of radon progeny. This standard specifies minimum performance requirements for radon measuring devices, as well as testing criteria for demonstrating and documenting compliance. The tests are to be conducted in a STAR under various conditions of radon concentration, temperature and humidity. A manufacturer or laboratory that makes or uses a device or measurement system that is listed by a national radon proficiency program may already have results of testing on file that could partially or fully suffice to demonstrate compliance with this standard. For example, results of device