Atomic bomb survivor data shows a significant association between developing cancer and a radiation exposure about 100 mSv.

WSJ: New Tracking of a Patient's Radiation Exposure

Also, even if the company is doing well, MSV could be negatively affected by industry or economic trends.

FORBES: The Place of Shareholder Value

Then, most of the other issues, MSV included, take care of themselves.

FORBES: The Place of Shareholder Value

Mr. Page, a maintenance technician who lives in Clearfield, Utah, learned that his cumulative exposure from multiple scans he received at Intermountain was 97.3 mSv.

WSJ: New Tracking of a Patient's Radiation Exposure

Radiation doses are measured in units known as millisieverts, or mSv.

WSJ: New Tracking of a Patient's Radiation Exposure

The overall risk of getting cancer in anyone's lifetime is 40% and some experts feel that 100 mSv of medical radiation can increase this by 1%.

WSJ: New Tracking of a Patient's Radiation Exposure

But focusing entirely on MSV brings its own baggage.

FORBES: The Place of Shareholder Value

In a July 17, 2002 letter to the FCC, lawyers for the council and Mobile Satellite Ventures, a LightSquared predecessor, urged the FCC to approve an agreement in which MSV would limit the power of ground stations to protect GPS receivers.

FORBES: As Icahn Circles, LightSquared Lashes Out At GPS Critics