Gallery: Cell phones with the lowest radiation levels

Emissions from a cell phone in the U.S., Europe and Canada must be measured and meet established standards before it can be put up for sale. Specific absorption rate, or SAR, is "a way of measuring the quantity of radio frequency (RF) energy that is absorbed by the body," according to the FCC.

The U.S. and Canada require a SAR rating below a maximum of 1.6 watts per kilogram while Europe will certify a phone with a SAR level below 2 watts per kilogram.

Some phones barely make the cut while others pass with ease. Here are the 20 cell phones with the lowest SAR index scores.

At No. 20 is the Casio Exilim C721from Verizon Wireless with a SAR level of 0.524. (review)

Tied at 18 is the Samsung SGH-T369 from T-Mobile with a SAR index of 0.52. (review)

Also at No. 18 is the Samsung Rugby II SGH-A847 from AT&T. It's SAR index is also 0.52. (review)

No. 17 is the Samsung SGH-T249 prepaid phone with a SAR index of ).51. (review)

At 16, AT&T's Samsung Flight A797 has a SAR index of 0.505. (review)

At No. 15, the HTC Imagio from Verizon Wireless has a SAR index of 0.498. (review)

The Samsung Contour from MetroPCS has a SAR index of 0.49 for 14th place. (review)

At No. 13, the Kyocera Neo E1100 from MetroPCS has a SAR index of 0.479. (review)

The Motorola i890 from Sprint is tied for 11th place with a SAR index of 0.45. (review)

Also at 11 is the Motorola Devour from Verizon Wireless which has a SAR rating of O.45. (review)

At No. 10 is theDoro PhoneEasy 410, a phone for seniors, which has a SAR index of 0.445. (review)

No. 9, the HTC Surround from AT&T, has a SAR index of 0.439. (review)

At 9, the Samsung Smiley from T-Mobile has a SAR index of 0.43. (review)

The No. 7 Samsung Captivate from AT&T has a SAR index of 0.42. (review)

Tied at No. 5 is the Samsung Evergreen from AT&T with a SAR index of 0.41. (review)

Also at 5 is the Samsung Haven from Verizon Wireless is also geared to seniors and has a SAR index of 0.41. (review)

At 4, the Samsung Gravity T from T-Mobile boasts a SAR index of 0.38. (review)

Tied at No. 3, the Kin 2 from Verizon Wireless is the only non-Samsung phone in the top 8. It has a SAR index of 0.29. (review)

Also at No. 2 is the Samsung Acclaim from U.S. Cellular with a SAR index of 0.29. (review)

And the cell phone with the lowest SAR index of 0.196 is the unlocked Samsung Blue Earth. (review)

Here is the complete list of cell phones with the lowest radiation levels.