HeadHASEBE, Mitsuyasu

Technical Staff:

Technical Assistant:

MATSUDA, Yoshimi(Radiation Protection Supervisor, Myodaiji area)
SAWADA, Kaoru
IINUMA, Hideko
HAYASHI, Tomoko

3. C leaning and checking the radioactive
wastewater storage tanks

All wastewater from the CRF is stored in the radioactive
wastewater storage tanks. Wastewater is discharged after
confirming that the concentration of RIs in the water isbelow the legal concentration limit. In February 2022, we
commissioned contractors to clean and inspect the inside ofthe tanks. By this checking, the wastewater storage tanks
were diagnosed to continue to be usable.
The figures for training courses of RI handling are shown inTable 1. The annual changes of the CRF registrants and thetotal number of entrances to the CRF per fiscal year are shownin Figure 1. The numbers of the CRF registrants and users
from April 2021 to March 2022 are shown in Table 2. During
this period the total number of the users and visitors counted
by the access control system was 802 (Table 3). The balance ofRIs received and used at the CRF is shown in Table 4.
350

14000
# of registrants

1. Revision of the CRF’s rules

The CRF’s rules were revised twice in 2021. In April 2021,
to respond to the elimination of the seal and signature and thereorganization of the IMS technical organization, the CRF’s
two rules, the Center for Radioisotope Facilities Myoudaiji
District Experimental Facilities Radiation Damage
Protection Rules and the Center for Radioisotope Facilities
Myoudaiji District Experimental Facilities Radiology WorkerRegistration Procedure Guide, were revised accordingly. In
July 2021, to meet the revision of the Japanese relevant laws,
the CRF’s rule (Center for Radioisotope Facilities Myoudaiji
District Experimental Facilities Radiation Damage ProtectionRules) was revised. The main changes include:1) the measurement of exposure doses in the lens of theeyes (from “150mSv per year” to “50mSv per year and
100mSv per 5 years”)
2) the method of recording radiation dose measurements andcalculations

2. Renewal of the RI handling managementsystem

The relevant laws require the handling (acceptance, use,dispose and dispensing) of RIs to be recorded. The CRF has
used a PC software (the RI handling management system,
Aloka ISR1000), but the software is no longer compatible
with the current situation. With the approval of the CRF
Steering Committee, we renewed the software in March 2022
using budget allocated from NIBB and NIPS.

12000

Total number of entrances"

2021

2019

2017

2015

2013

2011

2009

2007

2005

2003

2001

0

1999

0

1997

2000

1995

4000

50

1993

100

1991

6000

1989

150

1987

8000

1985

200

1983

10000

1981

250

1979

The Center for Radioisotope Facilities (CRF) provides awell-established and comfortable environment for naturalscience researchers across Japan as part of the InterUniversity Research Institute Corporation. Center staff
maintain controlled areas in compliance with relevant laws
and monitor the purchase and transfer of radioisotopes (RIs).
The following is an outline of the major activities that CRF
conducted in 2021.

# of registrants

300

Total number of entrances

CENTER FOR RADIOISOTOPE FACILITIESFigure 1. Annual number of the CRF registrants and the total number ofentrances to the CRF
Table 1. Training courses offered for radiation workers during fiscal year 2021.

Training course
Introductory course for beginners
Introductory course for experts
Users training course
Radioisotope handling practice# of participants
0532
1

Table 2. Number of the CRF registrants and users during fiscal year 2021.

Type# of registrants# of users

The number of persons
3716

Table 3. Total number of uses by individual users and visitors during
fiscal year 2021.

Type

The number of persons# of users# of visitors

688
114

Table 4. RIs received and used (in kBq) during fiscal year 2021.

Nuclide
32
32
1414
3
3Situation

P

Received

C

Received

PCH
H

Used
Used

Received
Used

Radioactivity

59,20046,45018,50023,865037107