Japan Information | Community Environmental Monitoring Program

Update - April 5:
April calibration response tests of the ion chambers located at the CEMP stations will occur according to the following schedule. These calibration checks will result in brief spikes in gamma radiation readings, and are not related to actual increases in background radiation. These calibration response spikes will be subsequently removed during regular quality-assurance checks of the data, so as not to skew data averages.

April 5 - Indian Springs, Amargosa, Pahrump, Tecopa, Beatty, Sarcobatus, Goldfield
April 6 - Tonopah, Rachel, Alamo
April 12 - Caliente, Pioche, Garden Valley, Twin Springs, Nyala, Ely
April 13 - Cedar City, Milford, Delta, Overton, Mesquite, Duckwater, Stone Cabin, Medlin's Ranch
April 14 - St. George, Las Vegas, Henderson, Boulder City

Update - April 4:
Regular updates on Fukushima and other nuclear news at the Health Physics Society News Cafe Facebook Page.

Update - March 29:
As the situation in Japan continues to evolve, this blog will keep you abreast of the latest information on the assistance and expertise that DOE is providing to the Japanese response and recovery efforts.
→ US Department of Energy Blog on the Situation in Japan

Update - March 25:
Results of air filter samples collected by DRI from CEMP stations located in Las Vegas, Henderson, and Boulder City are becoming available. Air samples from other communities in the CEMP network will be analyzed as they are received, beginning the week of March 28^th.

Here is a blog designed for those who may have no knowledge or background in nuclear power and who are trying to understand issues related to the recent events in Japan. Any opinions expressed in the blog are those of the author, and DRI neither endorses any opinions expressed nor vouches for the accuracy of technical information provided. However, it is believed to provide an excellent primer on a number of different issues to those who are unfamiliar with these topics, and provides occasional updates of ongoing scenarios at the damaged plants as well as the opportunity to interact with the author and others in the forum.
→ Plain English Nuclear

Update - March 24:
Analysis of air samples collected by UNLV using a high-volume air sampler placed on the roof of the Bigelow Health Sciences building detected small amounts of radionuclides attributable to the Fukushima Daiichi nuclear plant accident in Japan. Click here for the results of the analysis.

Results of air filter samples collected by DRI from CEMP stations located in Las Vegas, Henderson, and Boulder City will be reported as they become available, beginning on March 25^th. Air samples from other communities in the CEMP network will be analyzed as they are received, beginning the week of March 28^th.

Update - March 23:
A calibration response test of the ion chamber located at the CEMP stations in Las Vegas will be carried out on March 23^rd. This calibration check will result in a brief spike in gamma radiation readings which is not related to an actual increase in background radiation.

Update - March 18:
There is a chance of precipitation forecast throughout the region covered by the CEMP beginning this weekend through early next week. Precipitation, as well as decreases in barometric pressure, both usually result in a small increase in background radiation. This is due to an increase of radon released from the ground, as well as the removal of naturally-occurring radionuclides from the atmosphere by rainfall. Increases observed in background gamma radiation readings during these meteorological events are expected, and are unlikely to be related to a radiation plume from Japan. DRI will examine any observed increases to ensure that they fall within the expected range for these events.

Information on the nuclear reactor accidents in Japan

The recent earthquake and tsunami in Japan have caused damage to multiple nuclear reactors in Japan, resulting in the release of some radioactivity into the airborne environment. Prevailing winds may carry a plume of radioactivity associated with these releases towards the United States. If a radioactive plume reaches the United States, it is unlikely to present a public health hazard, based on the information thus far reported regarding the release of radioactivity from the reactors. The pressurized ion chambers employed at monitoring stations in the CEMP are highly sensitive and can measure very small changes in environmental background gamma radiation exposure rates. It is likely they will detect such a plume if it does pass through the area. The CEMP will report any increases believed to be a result of the events in Japan, and will conduct further analyses of air filter samples as appropriate.

NOTE: Monthly calibration tests of the ion chambers located at the CEMP stations in Overton and Mesquite are scheduled to occur on March 17th, and at Las Vegas, Henderson, and Boulder City on March 18th. These calibration checks will result in brief spikes in gamma radiation readings which are not related to actual increases in background radiation.

For further information, please contact Ted Hartwell at (702) 862-5419.

Additional Information

Here are links to organizations that can provide additional useful information on the ongoing events associated with the nuclear power plants in Japan: