Flow peak detection using penalized asymmetric least squares in on-line isotope dilution-laser ablation-inductively coupled plasma-mass spectrometry

Yanagisawa, Kayo; Yokota, Hiromi*; Fujimoto, Katsushige*; Takagai, Yoshitaka*

Bunseki Kagaku, 73(9), p.515 - 522, 2024/09

https://doi.org/10.2116/bunsekikagaku.73.515

On-line isotope dilution-laser ablation-inductively coupled plasma-mass spectrometry (on-line ID-LA-ICP-MS) is capable of quantification for each point ablated by laser, then the quantitative mapping of elements can be also conducted by reconstruction of the obtained each point data. The volume of data obtained as flow peaks in this system as a flow injection analysis, will be multiplied by each data such as number of m/z, scan time, time resolution and measurement position, and the total amount of data is enormous, resulting in a large human power and time consumption for data processing. In this paper, an original application software using Python to improve the efficiency of data processing in on-line ID-LA-ICP-MS was developed. To discriminate between the time-to-peak intensity and the background noise, an automatic peak detection using penalized asymmetric least squares was developed.

Synthesized research report in the second mid-term research phase; Mizunami Underground Research Laboratory Project, Horonobe Underground Research Laboratory Project and Geo-stability Project

Hama, Katsuhiro; Mizuno, Takashi; Sasao, Eiji; Iwatsuki, Teruki; Saegusa, Hiromitsu; Sato, Toshinori; Fujita, Tomoo; Sasamoto, Hiroshi; Matsuoka, Toshiyuki; Yokota, Hideharu; et al.

JAEA-Research 2015-007, 269 Pages, 2015/08

JAEA-Research-2015-007.pdf:68.65MB
JAEA-Research-2015-007(errata).pdf:0.07MB

We have synthesised the research results from Mizunami/Horonobe URLs and geo-stability projects in the second mid-term research phase. It could be used as technical bases for NUMO/Regulator in each decision point from sitting to beginning of disposal (Principal Investigation to Detailed Investigation Phase). High quality construction techniques and field investigation methods have been developed and implemented and these will be directly applicable to the National Disposal Program (along with general assessments of hazardous natural events and processes). It will be crucial to acquire technical knowledge on decisions of partial backfilling and final closure by actual field experiments in Mizunami/Horonobe URLs as main themes for the next phases.

Highly efficient frequency doubling of high-energy Nd:YAG laser using a CsBO crystal

Suzuki, Masayuki; Kiriyama, Hiromitsu; Nakai, Yoshiki; Okada, Hajime; Daito, Izuru; Kagebayashi, Yoshio*; Yokota, Toshio*; Bolton, P.; Daido, Hiroyuki; Kawanishi, Shunichi

Optics Communications, 283(3), p.451 - 453, 2010/02

https://doi.org/10.1016/j.optcom.2009.10.015

We have demonstrated efficient frequency doubling of high energy fundamental Nd:YAG laser pulse energy of the multi-J level at a high repetition rate using high optical quality top-seeded solution growth CsBO (TSSG-CBO) crystal. Second-harmonic (532 nm) generation (SHG) output energy of 12 W at 10 Hz is obtained with a conversion efficiency of 60% The numerical calculation SHG efficiency agrees well with the measured results. These results indicate that CBO is a good candidate material for high energy SHG of Nd-doped lasers at the several J level or more with high repetition rate.

Development of software to support the efficiency of mass spectrometric imaging

Yanagisawa, Kayo; Yokota, Hiromi; Matsueda, Makoto; Ishiniwa, Hiroko*; Fujimoto, Katsushige*; Takagai, Yoshitaka*

no journal, , 

Fuel debris is considered a heterogeneous mixture of nuclear fuel, control rods and reactor structural materials that has cooled and solidified, and it is important to understand its composition (elements and isotopes) and distribution to formulate storage, treatment and disposal methods after fuel debris removal. Mass spectrometric imaging using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is useful for the aforementioned fuel debris analysis because it can visualise the distribution of elements and isotopes at the 10 - 10 g/g level with a spatial resolution of 10-100 m. However, the number of data is enormous when the number of measurement points is large. In this study, an automatic peak detection method using the asymmetric least squares method with a penalty term was developed, data processing for LA-ICP-MS was automated and an intuitive GUI was constructed.

A New spectral analysis method based on non-peak searching algorithm for Laser Induced Breakdown Spectroscopy (LIBS)

Yokota, Hiromi*; Fujimoto, Katsushige*; Kawakami, Tomohiko*; Nagayama, Sakiko*; Abe, Yuta; Otaka, Masahiko

no journal, , 

no abstracts in English

Generation of high energy, efficient green laser pulse by high quality CBO crystal

Suzuki, Masayuki; Kiriyama, Hiromitsu; Nakai, Yoshiki; Okada, Hajime; Daito, Izuru; Kagebayashi, Yoshio*; Yokota, Toshio*; Bolton, P.; Daido, Hiroyuki; Kawanishi, Shunichi

no journal, , 

A second harmonic generation (SHG) of Nd:YAG or Nd:glass is typically utilizing to pump the Ti:sapphire chirped-pulse amplification laser system for realizing a high intensity pulse laser. CsBO (CBO) crystal has a potential to obtain the high energy SHG because the effective nonlinear coefficient and damage threshold are high. In this presentation, we have demonstrated efficient frequency doubling of high energy fundamental Nd:YAG laser pulse energy of the 1.2 J with a conversion efficiency of 60% at a 10 Hz using high optical quality top-seeded solution growth CBO (TSSG-CBO) crystal. These results indicate that TSSG-CBO is a good candidate material for high energy SHG of Nd-doped lasers at the several J level with high repetition.