Decontamination Plan for the Concrete of the Activated Accelerator Room and Its Implementation: A Case Study in the Decommissioning of the PET Cyclotron Room at the Medical and Pharmacological Research Center Foundation

Miyazaki Yoshiharu, Yoshida Go, Masumoto Kazuyoshi, Matsumura Hiroshi, Tanaka Masahiro

doi:10.3769/radioisotopes.69.365

Bibliographic Information

Other Title

放射化した加速器室コンクリートに対する除染計画とその実施：先端医学薬学研究センターにおけるPETデリバリー製造用サイクロトロン加速器室の廃止措置の研究事例
ホウシャカシタカソクキシツコンクリートニタイスルジョセンケイカクトソノジッシ : センタンイガクヤクガクケンキュウセンターニオケル PET デリバリーセイゾウヨウサイクロトロンカソクキシツノハイシソチノケンキュウジレイ

Search this article

Abstract

<p>Herein, we present the case study of the decontamination of highly activated concrete in the accelerator room. The activated cyclotron room for pharmaceutical for the positron emission tomography (PET) in the Medical and Pharmacological Research Center Foundation (Ishikawa, Japan) was decontaminated. The contact dose rates of the concrete walls, floor, and ceiling were measured at 50 cm mesh using a NaI survey meter. The depth profiles of specific activity in the concretes were obtained by core boring at seven different places. The activated concrete regions were estimated in detail based on the relationship between the measured contact dose rates and depth profiles of the specific activity. The activated concrete was chipped and removed based on the estimated activated region. Then, through remeasurement, it was confirmed that the removal of the activated concrete was completed. The measurement of the contact dose rate using the NaI survey meter could determine the removal depths of the concrete at short range mesh. This contributed to the reduction of radioactive waste.</p>

Journal

RADIOISOTOPES

RADIOISOTOPES 69 (12), 365-373, 2020-12-15

Japan Radioisotope Association

Keywords

Details 詳細情報について

Export