Radon measurement methods and radon measurment tools

A radon detection and measurement device that is configured to have a pre-deployment laboratory calibration and is configured for a single measurement interval, the device comprising:

• a housing that defines an internal cavity and includes a vent;
• a diffusion chamber disposed in the internal cavity, the diffusion chamber including a casing that substantially prevents introduction of ambient light into the diffusion chamber;
• a diffusion chamber sensor positioned in the diffusion chamber, the diffusion chamber sensor being configured to detect radioactive decay of radon in the diffusion chamber and responsive to detection of the radioactive decay, the diffusion chamber sensor is configured to generate an electrical signal;
• a diffusion pathway that is coupled between the diffusion chamber and the vent, the diffusion pathway being configured to enable introduction of ambient air into the diffusion chamber;
• a clock circuit configured to output time data responsive to an initiation signal;
• measurement circuitry communicatively coupled to the diffusion chamber sensor and the clock circuit, the measurement circuitry being configured to receive the electrical signal from the diffusion chamber sensor and to associate with the electrical signal a particular time datum that is based on the time data at which the electrical signal is received in a detection data set;
• and
• a triggering mechanism that includes:
• a first feature that selectively physically isolates the vent from an ambient environment;
• and
• an electrical insulator configured to selectively electrically trigger the measurement circuitry, wherein:
• the triggering mechanism is configured to respond to a triggering action by concurrently or substantially concurrently affecting the first feature and the electrical insulator such that the diffusion pathway is fluidly connected with the ambient environment via the vent and functionality of the measurement circuitry is initiated, and
• the measurement circuitry is configured to limit the detection data set to a time period between the triggering action and the measurement interval.