Washington ( CNN ) -- The Transportation Security Administration on Friday ordered re-testing of all radiation-emitting full-body scanners after an internal review showed calculation errors , missing data and other discrepancies on paperwork by contractors who routinely check the machines ' radiation levels . As recently as Wednesday , the agency vouched for the safety of the machines , with Homeland Security Secretary Janet Napolitano telling a Senate committee that independent studies concluded the machines are `` more then safe . '' `` The amount of radiation is approximately ( the same as that received ) as two minutes in the air , '' Napolitano said . The TSA reiterated that position Friday , characterizing problems as `` record-keeping errors . '' But Sen. Susan Collins , R-Maine , said the TSA found problems with more than one-quarter of the reports it reviewed , `` including gross errors about radiation emissions . '' `` That is completely unacceptable when it comes to monitoring radiation , '' Collins said . `` If TSA contractors reporting on the radiation levels have done such a poor job , how can airline passengers and crew have confidence in the data used by the TSA to reassure the public ? '' The TSA said all `` backscatter '' full body scanners will be re-tested by the end of March , the TSA said . It will also require contractors to re-train machine testers , while increasing TSA oversight over the tests . Further , the TSA said it would ask the National Institute for Occupational Safety and Health ( NIOSH ) to update its 2008 report . The announcements came as the TSA , responding to public pressure , posted raw data about radiation tests on its website . The agency also promised to post all future radiation checks on the web site for public review . The TSA said its internal review looked at randomly selected reports generated over the last two years at 15 airports . The tests are conducted by manufacturers and contractors . `` These reports confirm that each piece of technology reviewed meets all national safety standards , '' the TSA said . But , the TSA said , the reports contained `` inaccuracies . '' Those inaccuracies included `` calculation errors not impacting safety , '' no reading of background radiation levels , and missing `` non-measurement related information . '' TSA spokesman Nicholas Kimball said Friday that numerous independent tests have confirmed that body scanners are safe , `` but these record-keeping errors are not acceptable . '' `` We 're taking a number of steps to ensure the mistakes are n't repeated and the public will be able to see for themselves by reviewing all future reports online , '' Kimball said . Marc Rotenberg , president of a privacy rights group and a critic of the full-body scanners , said the latest development is `` more evidence '' that the TSA should suspend use of the machines . A House government oversight subcommittee will hold a hearing on TSA oversight of the full-body scanners on Wednesday .
The TSA characterizes them as ` ` record - keeping errors '' A senator says the agency found problems with a quarter of reports reviewed . A House committee will hold a hearing on the oversight of the scanners next week .