Today's Tech: RIM reveals prices of new PlayBook, Nokia to launch Windows Phone 8 devices, iPhone radiation rates revealed

RIM, the Little Engine That Could of the mobile world, last week announced the launch of a brand new 4G LTE BlackBerry PlayBook, presumably designed to kick off its comeback season. But after revealing the prices of the device today - $549.99 (£353) for a 32GB tablet on a no-term contract, for instance - it appears RIM could have a difficult time competing with the likes of Google's attractively priced Nexus 7.

Good news for Nokia-philes, though. According to a Bloomberg report, the Finnish company may be preparing to announce its line of first-generation Windows Phone 8 handsets as early as September. Citing "a person with knowledge of the matter," the wire says consumers can expect the devices, as well as a pair of new-and-improved Lumia phones, to be unveiled at Nokia World 2012, a week ahead of the expected launch of the new iPhone.

Speaking of which, Apple's current-generation smartphone has gotten a less-than-desirable rating from radiation safety experts Tawkon. The firm's data reveals that the iPhone 4S has a specific absorption rate three times as great as the Galaxy S3, meaning iPhone users are absorbing more radiation than their peers using Samsung's flagship smartphone. Still, it should be noted that both devices are below the maximum levels recommended by various regulatory bodies.

In yet more Apple bad news, the company's brand-new OS X Mountain Lion is reportedly causing the battery life on some MacBook Pros and MacBook Airs to drop significantly. Users have taken to Apple's support forums since the operating system's release two weeks ago to complain about adverse effects on their computers' battery life. Apple is apparently working with impacted users gather information about the problem and, presumably, work on a fix.

On the search engine front, Chinese search giant Baidu has fired four employees suspected of accepting bribes to delete unfavourable posts on the company's forum. The workers accepted thousands of pounds in payments, the firm's spokesperson said. Three of the employees in question have been arrested, though it's unclear why a fourth appears to have been left off the hook thus far.