IV. OPERATION RECORDS

RIKEN Accel. Prog. Rep. 54 (2021)

RIKEN Accel. Prog. Rep. 54 (2021)

Fee-based activities of the Industrial Application Research TeamA. Yoshida,∗1 T. Kambara,∗1 H. Haba,∗1 A. Nambu,∗1 and D. Mori∗1
The fee-based activities of the Industrial Application
Research Team in 2020, which are the utilization ofheavy-ion beams in the industry and the distributionof radioisotopes, are summarized below.
RIKEN Nishina Center allows the use of the AVF
cyclotron, RILAC, and RIKEN Ring Cyclotron (RRC)
by private companies in Japan for a fee.1) At present,
the main users are semiconductor companies that irradiate space-use semiconductor devices with Ar, Kr,and Xe ions from the RRC to simulate single-event
eﬀects due to the heavy-ion components of cosmic radiation. Proposals for beam utilization are reviewed
by a program advisory committee dedicated to industrial use (InPAC). In July 2020, InPAC reviewed andapproved via e-mail three proposals that were in continuation to previously approved proposals and held its
10th meeting online, where it reviewed and approved
two new proposals. In 2020, six companies executed
eleven fee-based beamtimes, seven of which utilized aKr beam with a total beam time of 153 h and four
utilized an Ar beam with a total beam time of 73 h.
In response to the users’ demand, we are preparing to
supply C ions and considering the supply of Xe ionswith higher energies.
Since 2007, RIKEN has distributed radioisotopes(RIs) to users in Japan for a fee in collaboration with
the Japan Radioisotope Association2) (JRIA). The nuclides are 65 Zn (T1/2 = 244 days), 109 Cd (T1/2 = 463days), 88 Y (T1/2 = 107 days), 85 Sr (T1/2 = 65 days),and 67 Cu (T1/2 = 61.8 hours) produced at the AVF cyclotron by the Nuclear Chemistry Research Team. According to a material transfer agreement (MTA) drawn
between JRIA and RIKEN, JRIA mediates the transaction of the RIs and distributes them to users. 65 Zn
and 109 Cd are delivered approximately two weeks after
the acceptance of an order. 85 Sr, 88 Y, and 67 Cu, whichhave short half-lives, are not stocked like 65 Zn and109
Cd but are instead produced in a scheduled beamtime after an order is accepted. Therefore, they aredelivered two months or more after an order. Details
can be found in the online ordering system J-RAM3)of JRIA.
In 2020, we delivered one shipment of 109 Cd with anactivity of 10 MBq, three of 65 Zn with a total activityof 12 MBq, two of 88 Y with a total activity of 2 MBq,
and two of 85 Sr with a total activity of 3 MBq. The
ﬁnal recipients of the RIs were four universities, one
private company, and one medical research center.
Figure 1 shows the yearly trends in the number oforders and the amounts of distributed RIs. Comparedwith 2019, the amounts of distributed 109 Cd, 65 Zn, and∗1

Sr increased, that of distributed 67 Cu decreased, andthat of distributed 88 Y remained the same. During
the past 10 years, the demand for long-lived RIs has
drastically decreased, whereas that for short-lived RIs
is increasing.

85Fig. 1. Number of orders (upper) and amounts (lower) of
the RIs distributed yearly from 2007 to 2020. The distribution of 88 Y started in 2010, that of 85 Sr in 2015,
and that of 67 Cu in 2018.

References1) http://ribf.riken.jp/sisetu-kyoyo/ (Japanese).
2) http://www.jrias.or.jp/ (Japanese),
http://www.jrias.or.jp/e/ (English).
3) https://j-ram.org (Japanese).

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