2015 Dose Data from the Fixed Point Surveillance Network
The Fixed Point Surveillance (FPS) network monitors public radiation dose due to radioactive materials in the atmosphere. The FPS network is used primarily to measure the external dose from three noble gases in particular; Argon-41, Xenon-133 and Xenon-135, as well as the total combined external dose from all sources, measured as Total Air KERMA.
For all of the tables on this page, the following definitions apply:
A Gray (Gy) is a standard unit of measurement for radiation dose, defined as 1 Joule of energy deposited per kilogram of matter. A nanoGray (nGy) is 1x10 -6 milliSieverts (mSv) and it is a much more common unit of measure for these types of very low doses.
KERMA (Kinetic Energy Released in Matter)
In this case the 'Total Air KERMA' refers to the radiation dose from all external gamma sources, not just from the three noble gases Argon-41, Xenon-133 and Xenon-135. This includes natural background radiation as well, such as from mineral deposits in the ground or radon gas in the air.
The system has a limit on the amount of low-level radiation it can reliably detect and use to calculate a monthly dose and the hyphens represent any data which falls below this detection limit. The minimum detectable dose for the three noble gases being monitored are:
- 6 nGy/month for Argon-41
- 3 nGy/month for Xenon-133
- 3 nGy/month for Xenon-135
The dose data for this month was not collected due to a problem with the equipment or data transfer.
Please click on a system name below to navigate directly to that system's data table.
The tables below show the most recent dose data available from the FPS network. Data is normally updated quarterly. (Last update: January 30th, 2016).
Gentilly System - 2015
Bruce System - 2015
Greater Toronto Area/Lake Ontario System - 2015
Darlington Perimeter System - 2015
Pickering Perimeter System - 2015
Ottawa Valley System - 2015
Regional System - 2015
Point Lepreau System - 2015
Vancouver Island System - 2015
Halifax System - 2015
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