Safety Guide Date on Radiation Shielding in a Reprocessing Facility

Sekiguchi, Akira*;

JAERI-M 86-060, 267 Pages, 1986/04

JAERI-M-86-060.pdf:7.01MB

no abstracts in English

A Helium-3 proportional counter technique for estimating fast and intermediate neutrons

Kosako, Toshiso*; Nakazawa, Masaharu*; Wakabayashi, Hiroaki*; Sekiguchi, Akira*

PNC TJ260 78-06, 97 Pages, 1976/11

PNC-TJ260-78-06.pdf:4.58MB

He proportional counter was employed to determine the fast and intermediateneutron spectra of wide energy region. The mixed gas (He, Kr) type counterresponse and the spectrum unfolding code were prepared and applied to some neutronfields. The counter response calculation was performed by using the Monte Carlocode,paying regards to dealing of the particle range calculation of the mixed gas.An experiment was carried out by using the van de Graaff accelerator to check theresponse function. The spectrum unfolding code was prepared so that it mayhave the function of automatic evaluation of the higher energy spectum's effectto the pulse hight distribution of the lower energy region. The neutron spectraof the various neutron fields were measured and compared with the calculations suchas the discrete ordinate Sn calculations. It became clear that the techniquedeveloped here can be applied to the practical use in the neutron energy rangefrom about 150 KeV to 5 MeV.

Laser plasma interaction and the ion acceleration experiments by high contrast high intensity laser J-KAREN-P system

Nishiuchi, Mamiko; Sakaki, Hironao; Pirozhkov, A. S.; Sagisaka, Akito; Kon, Akira; Fukuda, Yuji; Kiriyama, Hiromitsu; Dover, N.*; Sekiguchi, Kentaro; Ogura, Koichi; et al.

no journal, , 

Petawatt class laser systems are in nowadays almost ready to work in all over the world. High energy particles accelerated by the interaction between laser pulses from high intensity laser system and the material shows interesting and particular parameters. Therefore those attract many fields of applications. High contrast and ultra high intensity laser system J-KAREN at KPSI is now under upgrading for achieving highest energy ion beams. No laser system with pulse duration less than 100 fs has demonstrated 100 MeV class proton acceleration in the world. To achieve high energy ions requires higher intensity laser on the target. We report on this presentation the status of the upgrading and the experimental results obtained at the first light experiment.