for Japanese


16 March, 2015

Cesium-only Measurements Now Possible at Fukushima

On March 9, a joint research group from RIKEN (Japan’s largest comprehensive research institution) and G-Tech Corporation announced their development of radiation measuring equipment that can inexpensively and nondestructively detect radioactive cesium contamination in food, distinguishing it from background radiation caused by natural levels of radioactive potassium.

In Fukushima Prefecture, four years after the March 2011 accident at the Fukushima Daiichi Nuclear Power Station, there is still fear and misinformation about food. In an effort to prevent damage caused by rumors and the like, measurements are made of radioactivity in agricultural and fishery products, as well as in the processed foods that use them, to confirm their safety.

Conventional detectors — using scintillators that fluoresce in the presence of radiation (gamma rays) — are located at the bottom of testing containers. As it is hard for such detectors to measure food in many configurations and packages, the food often must be ground up in a mixer, which destroys it.

To measure food without grinding it up, the joint team developed a device with scintillators positioned around the entire inner surface of the container, in a way that envelops or wraps the food. To do that, the team decided to use scintillators made of plastic owing to its low cost and relative ease to form into desired shapes.

Normally, however, plastic scintillators are not sensitive enough to easily distinguish between naturally-occurring potassium and the radioactive cesium isotopes emitted after nuclear accidents. The distribution of photon energy from plastic scintillators was precisely studied, allowing the group to eventually develop an algorithm to separate the signals from the various sources.

Employing that method, the group developed a radiation-measuring device featuring tubular-type plastic scintillators. The name of the device is LANFOS, standing for “Large Area Non-destructive Food Sampler.”

The LANFOS technology will allow the manufacture of large, inexpensive radiation detectors that can analyze packages of food just as they are, without destroying their contents. That will enable the thorough inspection of all packaged foods before shipment.


This site uses Akismet to reduce spam. Learn how your comment data is processed.

SNS facebooktwitter

NPPs Map


Grossi on Fukushima: Marking a Decade Since the Accident

10 March, 2021
Grossi on Fukushima: Marking a Decade Since the Accident04:11

Recent News

18 November, 2021
METI Minister Speaks to IAEA International Conference on Decade of Progress Since Fukushima Daiichi Accident
15 November, 2021
Nuclear Energy’s Contribution to Achieving SDGs
8 November, 2021
COP26: Prime Minister Kishida Announces Additional Contribution of USD10 Billion for Climate Change Measures
30 October, 2021
Reelection of Suttsu Mayor Means Literature Investigation for HLW Disposal Will Continue
21 October, 2021
Kishida Makes First Visit to Fukushima Since Becoming Prime Minister
15 October, 2021
LDP Adds SMR Development and Nuclear Fusion to NPP Restarts in Its Policy Manifesto
7 October, 2021
Kishida Administration Inaugurated, with New METI Minister Hagiuda Holding Press Conference on Taking Office
6 October, 2021
IAEA Holds 65th General Conference in Vienna, with Japanese Minister of State for Science and Technology Delivering Statement in the General Debate
30 September, 2021
JAEC Releases 2020 White Paper on Nuclear Energy
17 September, 2021
NRA Permits Shimane-2 under New Regulatory Standards
14 September, 2021
IAEA Deputy Director General Evrard Visits Japan in Advance of Safety Review of ALPS-treated Water
1 September, 2021
Evaluation Report Issued by IAEA’s Review Mission to Fukushima Daiichi: First Visit since 2018
24 August, 2021
METI and IAEA Agree on Further Review Missions to Fukushima Daiichi
4 August, 2021
JAEA Restarts High-Temperature Engineering Test Reactor “HTTR”
2 August, 2021
Information about Fukushima Daiichi NPS Water Treatment
28 July, 2021
METI’s Committee Shows Rough Draft of Next Strategic Energy Plan
2 July, 2021
Mihama-3 Restarted After Decade-long Hiatus: First Restart in Japan of a Reactor Operating Beyond 40 Years
28 June, 2021
Mihama-3 Restarts after Decade-long Hiatus
25 June, 2021
New Canada-Japan Partnership Supports Greater Collaboration to Meet Climate Change Objectives and Net-zero Goals
24 June, 2021
METI Issues New Green Growth Strategy Through Achieving Carbon Neutrality