Radiation monitoring | Device roundup

Toshiba gamma positioning camera

20 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.


Image of Fukushima Daiichi unit 1 airlock
Image of Fukushima Daiichi unit 1 airlock taken by gamma camera

Gamma camera view of the same image, showing radiation intensity
Gamma camera view of the same image, showing radiation intensity

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.


Toshiba gamma camera
Toshiba gamma camera

Toshiba gamma camera rig in use
Toshiba gamma camera in use

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.


Toshiba gamma camera Toshiba gamma camera
Toshiba gamma camera rig in use Toshiba gamma camera rig in use
Gamma camera view of the same image, showing radiation intensity Gamma camera view of the same image, showing radiation intensity
Image of Fukushima Daiichi unit 1 airlock Image of Fukushima Daiichi unit 1 airlock


Privacy Policy
We have updated our privacy policy. In the latest update it explains what cookies are and how we use them on our site. To learn more about cookies and their benefits, please view our privacy policy. Please be aware that parts of this site will not function correctly if you disable cookies. By continuing to use this site, you consent to our use of cookies in accordance with our privacy policy unless you have disabled them.