Radiation monitoring | Device roundup
Toshiba gamma positioning camera20 April 2012
A Toshiba camera not yet for sale commercially has been helping workers at Fukushima Daiichi determine areas of high gamma radiation.
The camera superimposes two images: a standard black and white image, and a 16-by-16 coloured grid.
The coloured grid is created by a 16x8 array of CdTe semi-conductor gamma detectors (interpolated by software) aimed at the same focal plane as the digital camera. Toshiba would not say exactly how they are arranged inside the camera to produce the image. The intensity of the gamma reading, and hence the shades of the colour scale, is not absolute, but can be customised by users. Toshiba declined to specify the energy sensitivity of the device.
Minimum standoff distance is 0.75 m. The refresh rate of the device is 1.5 seconds/image. In use, the camera is set up on a tripod and connected to a PC, from which it is operated, and to which it saves the photographs.
The camera was developed for decommissioning work in Japan, and Toshiba teams are using it to help the process; this is the urgent priority, a Toshiba spokesman said; commercial sales can come later.