| Feb. 1974 | Nagase-Landauer, Ltd., was established as a joint venture of Nagase & Co., Ltd. (listed on the first section of both the Tokyo and Osaka stock exchange) and Tech/Ops Landauer, Inc. (Currently named　Landauer, Inc., listend on the New York stock exchange) with a capital of 47.7 million (JPY). Established Radiation Dosimetry Services using Film Dosimeters. |
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| Apr. 1976 | Established Osaka Sales Office |
| Apr. 1979 | Established Ring badge Services using TLD Ring Dosimeters from the USA |
| Apr. 1985 | Launched the Neutrak badge Service for Neutron Dosimetry using the etched pit method developed by the company |
| Sep. 1988 | Began exporting ADC precise molded product Baryotrak to the USA, a product co-developed with Fukuvi Chemical Industry Co., Ltd. |
| Oct. 1990 | Exclusive Distributorship Agreement with BTI Canada for Bubble Detectors |
| Dec. 1990 | Increased the Capital to 88 million (JPY) |
| Oct. 1997 | Began the sales of Harzlas TNF-1, a high-energy heavy charged particle detector |
| Apr. 2000 | Began using OSL dosimeters for dosimetry with the Luxel Badge from Landauer USA |
| Mar. 2001 | Completely converted from Film badge to Luxel badge (OSL Dosimeters) |
| Apr. 2002 | Obtained the ISO 9001:2000 accreditation for the Luxel badge Service |
| Apr. 2005 | Obtained the ISO 9001:2000 accreditation for the Ring badge Service |
| Nov. 2009 | Completed the construction of the New Head Office and factory in Tsukuba City |
| Apr. 2010 | Launched the QuIxel badge Service |
| Jul. 2010 | Obtained the ISO 9001:2008 accreditation for the QuIxel badge Service |
| Sep. 2014 | Expanded the manufacturing base and capacity |
| Apr. 2017 | Launched the Luminess badge Service |
| May. 2017 | Obtained the ISO 9001:2015 accreditation for the Luminess badge Service |
| Mar. 2019 | Obtained the ISO 17025:2017 accreditation for the Luminess Badge Service |
| Apr. 2021 | Launched the Vision badge Service |
