Current status of radiation chemistry in India with perspective to antioxidants and metal nanoparticles

In the world scenario understanding radiation chemistry in the time domain of hundreds of nano seconds tomilliseconds started with the inception of pulse radiolysis technique. In India also research on time-resolved radia-tion chemistry started after the linear accelerator based pulse radiolysis system was set up in 1986 in ChemistryDivision of Bhabha Atomic Research Centre. In the initial years the basic understanding of the mechanisms un-derlying redox reactions of organic compounds was th…     

印度辐射化学研究现状--抗氧化剂与纳米金属研究展望

In the world scenario understanding radiation chemistry in the time domain of hundreds of nano seconds to milliseconds started with the inception of pulse radiolysis technique. In India also research on time-resolved radiation chemistry started after the linear accelerator based pulse radiolysis system was set up in 1986 in Chemistry Division of Bhabha Atomic Research Centre. In the initial years the basic understanding of the mechanisms underlying redox reactions of organic compounds was the main area of research. The basic thrust was in characterizing the transients, determination ofredox potentials, rate constants, ionic equilibria, etc.     

COMMUNICATION OF NUCLEAR DATA PROGRESS No.16(1996)

This is the 16th issue of Communication of Nuclear Data Progress (CNDP), in which the achievements in nuclear data field for the last year in P. R. China and a paper from India are carried. It includes the measurements of neutron activation cross section for ~(193)Ir (n, 2n) ~(192m2)Ir reaction at 14.7 MeV     

Synthesis of 2-[~(18)F]fluoro-3-[2(S)-2-azetidinylmethoxy]pyridine as a radioligand for imaging nicotinic acetylcholine receptors

Nicotinic acetylcholine receptors (nChRs) are involved in the various pharmacological effects or disease states. In order to study the central nChRs by PET or SPECT, some radioligands have been investigated. In this paper, the procedure for synthesis of 2-[18F]fluoro-3-[2(S)-2-azetidinylmethoxy]pyridine (2-[18F]-A-85380), a potential PET ligand for in vivo imaging nicotinic acetylcholine receptor was described. 2-[18F]-A-85380 was prepared from the precursor, 2-nitro-3-[(1-(tert-butoxycarbonyl)-2-(S)-azetidinyl)methoxy]pyridine(4), which was synthesized with commercial (S)-2-azetid- inecarboxylic acid as starting material. The whole procedure for radiosynthesis and purification was executed in about 1h and 45-55% of the added fluorine-18 was found in the purified 2-[18F]-A-85380, with specific activity of 1.0-2.2×1011 Bq/μmol.     

Evaluation and Calculation of Activation Cross Sections for ~(151,153)Eu(n,2n), (n,3n), (n,γ) and (n,x) Reactions below 20 MeV

Eu is a rare-earth element. Its activation cross section is important for nuclear science and technology applications. However, there are some discrepancies in several evaluated nuclear data libraries. The cross section for ~(151,153)Eu(n,2n) reactions were one of the Coordinate Research Programs of IAEA on activation cross sections     

美国《保健物理》(Health Physics)杂志英文摘要(2021年120卷第2期)

Microbial Contamination Risk and Disinfection of Radiation Protective Garments Stephen Balter 1,Michelle A.Rodriguez 2,Janett A.Pike 3,Norman J.Kleiman 4(1.Departments of Radiology and Medicine,College of Physicians and Surgeons Columbia University,New York,NY 10032;2.City University of New York(CUNY)Graduate School of Public Health and Health Policy New York,NY 10027;3.Department of Environmental Health Sciences Mailman School of Public Health Columbia University,New York,NY 10032;4.Infection Prevention&Control New York-Presbyterian Hospital New York,NY 10032).     

Evaluation and Calculation of Activation Cross Sections for ~(158,159)Tb(n,2n), (n,3n), (n,γ) and (n,x) Reactions Below 20 MeV

Introduction ~(159)Tb is a rare-earth element. Its activation cross section is a good indicator for nuclear science and technology applications. However, the evaluated data are very scarce in several nuclear data libraries. The cross section for ~(159)Tb(n,2n)~(158)Tb reaction was one of the Coordinate Research Program of IAEA on activation cross     

The AMS measurement of 236U at CIRCE

Accelerator mass spectrometry(AMS) is an ultrasensitive technique for measuring long-lived actinides,e.g.,~(236)U,~(237)Np and Pu isotopes.In order to improve the detection limit for actinides abundance,and to increase the detection efficiency in actinides AMS measurement,a 16-strip silicon detector was used to identify actinides at the Center for Isotopic Research on Cultural and Environmental heritage in Caserta,Italy.The sensitivity of ~(236)U/~(238)U was 1×10~(-11) by special resolution and 5.0×10~(-12) by time resolution.The pulse height defect of~(236)U in an ion-implanted silicon detector in the low-energy range with 17.26 MeV is presented.     

美国《保健物理》(Health Physics)杂志英文摘要(2022年122卷第2期)北大核心CSCD

SEED:An Operational Numerical Tool for Dosimetric Reconstruction in Case of External Radiological Overexposure F.Entine1,2,G.Garnier2,M.Dondey2,Y.Rizzi1,A.Gobert1,C.Bassinet1,S.Papin2,I.Pennacino2,A.Cazoulat2,J.C.Amabile3,C.Huet1(1.Institute for Radiation Protection and Nuclear Safety(IRSN),31 avenue de la Division Leclerc-92260 FONTENAY-AUX-ROSES,France;2.French Defense Radiation Protection Service(SPRA),1 bis rue du lieutenant Raoul Batany-CS500-92141 CLAMART Cedex,France;3.Armed Forces Medical Service Head quarters(DCSSA),60 boulevard du général Martial Valin-CS 21623-75509 PARIS Cedex 15,France).     

Two-Proton Simultaneous Emission From ~(29)S

The phenomena of two-proton emission are extensively studied in recent years[1-3]. The nucleus 29S, which the last two proton locates in 2s1/2 orbit may show such exotic behavior. Our previous experiment[4]     

R—RATRIX ANALYSIS FOR ~(17)O SYSTEM AND COMPARISON BETWEEN CODES RAC AND EDA

1 R-matrix Analysis of ~(17)O System This is a cooperation program of Tsinghua University,P.R.C.and LosAlomos National Laboratory(LANL),U.S.A.It was finished at LANL in theOct,1989.The analysis includes all best experimental data in ~(17)O system forneutron energies from 0 to 6.2 MeV.The result will be used in CEND-2 of P.R.C.and ENDF/B-4 of U.S.A.     

Measurements and Simulations of Neutron Wavelength Spectra at Curved Neutron Guide CNGB's End

<正>There are four curved neutron guides(CNGA,CNGB,CNGC and CNGD) in the guide hall of China Advanced Research Reactor.Neutron wavelength spectra at different points on the cross section of neutron guide CNGB end were measured and simulated.The results are summarized in Fig.1 and Fig.2.From the results,     

Instrumental neutron activation analysis of beachrock samples of South East Coast of Tamilnadu, India

Element profiles of some beach rock samples collected from South East Coast of Tamilnadu, India have been determined using single comparator method of INAA. The geo-chemical behavior of the elements in the region is discussed. The irradiations were done at thermal neutron flux of ~ 1011 cm-2·s-1 at 20kW power using Kalpakkam Mini Reactor (KAMINI), IGCAR, Kalpakkam, Tamilnadu, India. Around 19 elements have been determined from 15 samples by high-resolution gamma spectrometry. The accuracy and precision were evaluated by assaying the irradiated Standard Reference Material (SRM 1646a Estuarine sediment) and were found to be in good agreement with certified values.     

β-decay Study of T_z=-3/2Proton-rich Nucleus ~(29)S

<正>The exotic decay of nuclei far from the stability has recently become a hot topic of nuclear structure research.The nuclide ~(29)S is not well investigated in the A=4n+1,T_z=-3/2series of strong+β-delayed proton precursors.The decay schemes of these nuclei are characterized by     

Indirect Measurement of Astrophysical ~(13)C(α,n)~(16)O S-Factors

The 13C(α,n)16O reaction is believed to be the main neutron source reaction for the s-process in asymptotic giant branch (AGB) stars. The astrophysical S-factors of this reaction have been determined based on an evaluation of the α spectroscopic factor of the 1/2+ subthreshold state in 17O (Ex=6.356 MeV) by using the 13C(11B,7Li)17O α transfer reaction. Our result confirms that the 1/2+ subthreshold resonance is dominant for the 13C(α,n)16O reaction at low energies of astrophysical interest.     

Prototype Appratus for Radioactive Ion Beam Production in CARR

正The CARR(China Advanced Research Reactor)has been developed and in routine operation now,and its maximum neutron flux density is1×10~(15) cm~(-2)·s~(-1).High intensity fission products ion beam can be generated by installing ~(235)U target and ion source in reactor’s neuron tunnel.     

THE EVALUATIONS AND THEORETICAL CALCULATIONS OF ~(235)U(p,n)~(235)Np,~(235)U(p,2n)~(234)Np AND ~(235)U(d,2n)~(235)Np REACTION CROSS SECTIONS

The excitation functions of ~(235)U(p,n)~(235)Np,~(235)U(p,2n)~(234)Np and~(235)U(d,2n)~(235)Np reactions were calculated and evaluated respectively. Up to now,the experimental data for ~(235)U(p,n)and(p,2n)reactions in theenergy region from threshold to 25 MeV have not been found;Argonne Na-tional Lab.(ANL)and Lawrence Radiation Lab.at Berkeley(BRK)havemeasured the excitation function of~(235)U(d,2n)~(235)Np reaction respectively;buttheir data appear in great difference. New experimental data have to wait for being measured for unpredictabletime delays.In order to meet the practical requirements,the theoretical calcula-tion and experimental evaluation are carried out.     

Elemental analysis of rain－and fresh water by neutron activation analysis

Analysis of rain-and fresh water for trace constitutents is a mandatory part of environmental monitoring.This text gives a survey of neutron activation analysis(NAA) within the framework of current environmental water research programmes.based on the practice developed in co-operation with the Dutch Energy Research Centre at Petten(ECN).While the procedures reported in literature cover obout thirty five elements,our routine procedures of instrumental neutron activation analysis(INAA) is limited to ten to fifteen elements.THe use of some dedicated radiochemical separations(RNAA) adds another six,some of which are speciated as well.Current contributions of NAA to water analysis center on determination and speciation of anionic trace elements,notably Br.I,As,and Se,on the assay of some ultra traces like Ag,Au and Hg and on validation.     

Preclinical evaluation on ~(125)I-BMIPP

The biodistribution of 125I-BMIPP and the variation of myocardial uptake of 125I-BMIPP using the metabolic intervention drug were reported. Myocardial uptake of the 125I-BMIPP in rats showed a peak of 5.70ID%/g at 2 min. The ratios of myocardium to blood, to liver and to lung at 30 min were 3.40, 2.64 and 2.88 respectively. The initial elimination half time of 4.0 min in rabbits was in accordance with the half elimination time of free fatty acid from blood. Myocardial uptake of 125I-BMIPP in the group of glucose-insulin was significantly increased (p<0.05) than those of the normal control. In vivo and in vitro binding test for 125I-BMIPP to HSA showed a rather constant level of activation up to 2 h. Partition coefficients (1gP) were 1.93 and 1.68, respectively.     

Toward real-time digital pulse process algorithms for CsI(Tl) detector array at external target facility in HIRFL-CSR

A fully digital data acquisition system based on a field-programmable gate array(FPGA) was developed for a CsI(Tl) array at the external target facility(ETF) in the Heavy Ion Research Facility in Lanzhou(HIRFL). To process the CsI(Tl) signals generated by γ-rays and light-charged ions, a scheme for digital pulse processing algorithms is proposed. Every step in the algorithms was benchmarked using standard γ and α sources. The scheme, which included a moving average filter, baseline restoration, ...