As reference, I looked up the SAR of several phones... Samsung Galaxy SIII i535 (CDMA. VZW) had an overall rating of 1.29 US / 0.88 EU. Note the US and EU measure them differently. The US legal limit is 2.0. The source did not differentiate 'head' or 'body". source: http://sarshield.com/radiation-chart/
They're selling a radiation shield to help prevent exposure and it benefits them to provide lots of information - so take this with a grain of salt. It is very difficult to find comprehensive lists because the manufacturers would rather not have to publish this information. Lots of issues related to radiation exposure potentially causing brain cancer. Kind of like the cigarette manufacturers - smoking didn't cause cancer, no need to worry, nothing to see here, move along.
You make your own choices...
OnePlus One/64 - Calkulin OnePlus One v1.3 (CM11s 4.4.4), Franco Kernel r16, TWRP 220.127.116.11 custom - EFS backup
Google Nexus 10 - ROM: CM 11, Kernel: Stock, Recovery: TWRP 18.104.22.168
Samsung GS III - sold, HTC EVO 4G - retired