Radiation In Region Research Articles

The effects of alpha irradiation on the optical reflectivity of composite polymers

This paper reports an increase in the optical reflectivity of two kinds of copolymers used in contact lenses, with different proportions of silicon and fluorine derivatives, when irradiated with 4.1 MeV alpha particles from an 241Am source. The fiber-optic reflectance technique showed that the lens with a higher proportion of silicon and fluorine content and a lower proportion of methyl-methacrylate is more susceptible to alpha radiation. X-Ray photoelectron spectroscopy and Raman spectroscopy have revealed the formation of silicon oxide and carbide species as a result of chain scission and recombination in the 20 μm thick irradiated regions of lens materials. It is presumed that the high (260 eV/nm) linear energy transfer of alpha particles in polymers creates trapped gas “Bubbles”, and the observed increase in the optical reflectivity with increased irradiation time is explained on the basis of diffuse reflectance caused by the scattering of light from the hard surfaces of these “Bubbles”.

Obvious phase transition status induced by He+-ions implantation in KTN crystal

We report on the formation of a critical ferroelectric state induced by the He+ ion implantation in potassium tantalate niobate crystal. Obvious phase change has been observed in the ion irradiated region, which is mostly related to the stable polarized nanometric regions formed during the ion implantation process. Under the irradiation of 2 MeV He+ ions, two distinguishable layers corresponding to different energy transfer modes (elastic nuclear collision and inelastic electronic collision, respectively) between the incident He+ ions and the intrinsic lattices have been formed beneath the irradiated surface. Lattice dynamics before and after the ion implantation process are investigated by the confocal µ-Raman system. And the variations of typical Raman-active vibrational modes demonstrate the presence of lattice distortion in the irradiated region. X-ray diffraction experiments further suggest the mostly uniform lattice elongation in this region. Piezo-response force characteristic measurements reveal the existence of stable polarized nanometric regions with more intense polarization and verify that the crystal with such a phase status possesses extraordinary microscopic disorders, which is different from the traditional ferroelectric or paraelectric phase. Optical transmission experiments demonstrate that the irradiated region possesses relatively low propagation loss. The ion implantation method provides a new approach to form a temperature-stable critical ferroelectric state in relaxor ferroelectric materials. Analyses of the modification on the lattice dynamics of the irradiated region can help us build a clear awareness of the physical essence of this critical state and the relaxor ferroelectricity. Also, with good optical transmittance, the irradiated region is capable of promising optical functional devices.

Outcomes After Breast Radiation Therapy in a Diverse Patient Cohort With a Germline BRCA1/2 Mutation

BRCA1/2 pathogenic variant (PV) mutations confer radiation sensitivity preclinically, but there are limited data regarding breast cancer outcomes after radiation therapy (RT) among patients with documented BRCA1/2 PV mutations versus no PV mutations. This retrospective cohort study included women with clinical stage I-III breast cancer who received definitive surgery and RT and underwent BRCA1/2 genetic evaluation at the The University of Texas MD Anderson Cancer Center. Rates of locoregional recurrence (LRR), disease-specific death (DSD), toxicities, and second cancers were compared by BRCA1/2 PV status. Of the 2213 women who underwent BRCA1/2 testing, 63% self-reported their race as White, 13.6% as Black/African American, 17.6% as Hispanic, and 5.8% as Asian/American Indian/Alaska Native; 124 had BRCA1 and 100 had BRCA2 mutations; and 1394 (63%) received regional nodal RT. The median follow-up time for all patients was 7.4 years (95% confidence interval [CI], 7.1-7.7 years). No differences were found between the groups with and without BRCA1/2 PV mutations in 10-year cumulative incidences of LRR (with mutations: 11.6% [95% CI, 7.0%-17.6%]; without mutations: 6.6% [95% CI, 5.3%-8.0%]; P=.466) and DSD (with mutations: 12.3% [95% CI, 8.0%-17.7%]; without mutations: 13.8% [95% CI, 12.0%-15.8%]; P=.716). On multivariable analysis, BRCA1/2 status was not associated with LRR or DSD, but Black/African American patients (P=.036) and Asians/American Indians/Alaska Native patients (P=.002) were at higher risk of LRR compared with White patients, and Black/African American patients were at higher risk of DSD versus White patients (P=.004). No in-field, nonbreast second cancers were observed in the BRCA1/2 PV group. Rates of acute and late grade ≥3 radiation-related toxicity in the BCRA1/2 PV group were 5.4% (n=12) and 0.4% (n=1), respectively. Oncologic outcomes in a diverse cohort of patients with breast cancer who had a germline BRCA1/2 PV mutation and were treated with RT were similar to those of patients with no mutation, supporting the use of RT according to standard indications in patients with a germline BRCA1/2 PV mutation.

Multiple Gamma‐Ray Glows and a Downward TGF Observed From Nearby Thunderclouds

AbstractAround 17:00 on January 12, 2020 (UTC), radiation detectors installed at two locations with a 1.35 km separation in Kanazawa City, Japan, captured a total of four gamma‐ray enhancements. The first pair was simultaneously observed at the two locations at 17:03 and were abruptly terminated by a lightning discharge. The remaining two enhancements were also nearly simultaneously observed 3 min later, and one of them was also terminated by another lightning discharge. At the last termination, a downward terrestrial gamma‐ray flash and a negative energetic in‐cloud pulse were observed. Both pairs were associated with thundercloud cells. In the first pair, simultaneous detection in two locations 1.35 km apart suggests either a gamma‐ray glow emerged in‐between and time variability of its intensity were directly observed or there were two (or more) gamma‐ray glows in the cell which reached the two detectors coincidentally. In the latter pair, the peak time in the downwind detector was 40 s later than that of the upwind detector. If the irradiation region moved with the cell, it would have taken ∼110 s. The discrepancy suggests either the glow moved 2.5 times faster than the cell or there were two (or more) glows in the cell. Also, the fact that the thunderstorm cell hosting the latter glows experienced the lightning discharge 3 min before suggests that the strong electric field in the cell can develop within a few minutes.

Disordering kinetics in monocrystalline and epitaxial Si upon energy deposition induced by dual-beam ion irradiation

In this work, the effect on the amorphization process of the simultaneous electronic (Se) and nuclear (Sn) energy deposition occurring upon dual-beam irradiation experiments was studied in both bulk Si single-crystals (Si-b) and epitaxial Si thin layers (Si-tl). For this purpose, 900 keV I (for Sn) and 27 MeV Fe (for Se) ions were used at different fluences in order to get complete disordering kinetics. These latter were determined through the monitoring of both the disorder fraction, obtained via Rutherford backscattering spectrometry in channeling experiments and the elastic strain derived from X-ray diffraction measurements. Raman spectroscopy 2D-maps were also recorded to support the results of the two other techniques. RBS/C data indicate that Sn irradiation alone leads to full amorphization of the irradiated region in both Si-b and Si-tl at a fluence of 1.5 × 1014 cm−2. In contrast, during the dual-beam irradiation (Sn & Se), such a complete phase transformation is prevented up to a fluence of 3 × 1014 cm−2. Similarly, the maximum elastic strain developing before the loss of crystallinity reaches a maximum of ~ 1% at 1.5 × 1014 cm−2, but it remains below 0.2% at the same fluence in the Sn & Se regime for which full amorphization is not detected. These results indicate that the electronic energy deposition induces a significant dynamic annealing of the damage created by the nuclear energy loss, and this annealing occurs over the entire investigated fluence range (i.e., up to 3 × 1014 cm−2). The annealing efficiency is shown to be lower for Si-tl, as demonstrated by the disorder and strain values that are always larger than for the bulk counterpart.

Functional Modifications Induced via X‐ray Nanopatterning in TiO2 Rutile Single Crystals

The possibility to directly write electrically conducting channels in a desired position in rutile TiO2 devices equipped with asymmetric electrodes—like in memristive devices—by means of the X‐ray nanopatterning (XNP) technique (i.e., intense, localized irradiation exploiting an X‐ray nanobeam) is investigated. Device characterization is carried out by means of a multitechnique approach involving X‐ray fluorescence (XRF), X‐ray excited optical luminescence (XEOL), electrical transport, and atomic force microscopy (AFM) techniques. It is shown that the device conductivity increases and the rectifying effect of the Pt/TiO2 Schottky barrier decreases after irradiation with doses of the order of 1011 Gy and fluences of the order of 1012 J m−2. Irradiated regions also show the ability to pin and guide the electroforming process between the electrodes. Indications are that XNP should be able to promote the local formation of oxygen vacancies. This effect could lead to a more deterministic implementation of electroforming, being of interest for production of memristive devices.

Sequential ion-electron irradiation of zirconium carbide ceramics: Microstructural analysis

Zirconium Carbide (ZrCx) was irradiated with 10 MeV Au3+ ions to a dose of 10 displacements per atoms (dpa) and subsequently with 100 and 300 keV electrons in a transmission electron microscope (TEM). After ion irradiation, dislocation loops were observed in the microstructure and an increase in the number of carbon vacancies was revealed by Raman spectroscopy. Grazing incidence X-ray diffraction (GIXRD) analysis showed that neither amorphization nor oxidation occurred during ion irradiation of the specimen. Subsequent electron irradiation of the pre-implanted ZrCx foil led to formation of nanosized tetragonal ZrO2 precipitates (5−10 nm diameter) on the surface of the TEM lamella. The formation of the new oxide phase was not related to the electron beam-induced heating of the specimen, but to electron stimulated oxidation caused by the residual oxygen inside the transmission electron microscope. Changes in size and density of ZrO2 crystallites were observed between the pristine and ion irradiated ZrCx regions following electron irradiation, suggesting that the initial microstructure of the ZrCx substrate played a key role in the nucleation and growth of the oxide islands. The obtained results provide insights into the microstructural response of ZrCx to different types of radiation and the inadvertent effects of the electron beam during TEM analysis of in-situ and ex-situ ion irradiated ZrCx. Additionally, the findings of this work suggest a method to prepare local ZrO2 nanoprecipitates within ZrCx grains by selective electron beam irradiation.

In Vivo Study of the Efficacy and Safety of 5-Aminolevulinic Radiodynamic Therapy for Glioblastoma Fractionated Radiotherapy.

To treat malignant glioma, standard fractionated radiotherapy (RT; 60 Gy/30 fractions over 6 weeks) was performed post-surgery in combination with temozolomide to improve overall survival. Malignant glioblastoma recurrence rate is extremely high, and most recurrent tumors originate from the excision cavity in the high-dose irradiation region. In our previous study, protoporphyrin IX physicochemically enhanced reactive oxygen species generation by ionizing radiation and combined treatment with 5-aminolevulinic acid (5-ALA) and ionizing radiation, while radiodynamic therapy (RDT) improved tumor growth suppression in vivo in a melanoma mouse model. We examined the effect of 5-ALA RDT on the standard fractionated RT protocol using U251MG- or U87MG-bearing mice. 5-ALA was orally administered at 60 or 120 mg/kg, 4 h prior to irradiation. In both models, combined treatment with 5-ALA slowed tumor progression and promoted regression compared to treatment with ionizing radiation alone. The standard fractionated RT protocol of 60 Gy in 30 fractions with oral administration of 120 and 240 mg/kg 5-ALA, the human equivalent dose of photodynamic diagnosis, revealed no significant increase in toxicity to normal skin or brain tissue compared to ionizing radiation alone. Thus, RDT is expected to enhance RT treatment of glioblastoma without severe toxicity under clinically feasible conditions.

Computational simulator that calculates tumor control probability in a tumor heterogeneously irradiated for fractionated radiation oncology treatments

Although in the ionizing radiation field many concepts and processes are currently recognized as radiobiological, there are also probabilistic ones, and a probabilistic treatment makes a better understanding about them. The purpose of this study is to develop a new radiobiological simulator that calculates the tumor control probability (TCP) for a tumor heterogeneously irradiated from a fractioned treatment. The three possible types of cells and the results of interactions of ionizing radiation with each cell of a determined volume are analyzed. For an irradiated region with a dose per fraction d, the simulator determines the radiation biological effects using the cell kill ( K) and cell sub-lethal damage, volume, cell density, cell repair of damaged cells during the interfractions, and number of fractions. K is determined from its probabilistic complement, the cell survival ( S), described with the linear-quadratic (LQ) S(d) model as K = 1 − LQ S( d). TCP is calculated from computational simulations as in the ratio of simulations with K = 100% and their total. This application opens new avenues for theoretical and experimental investigations concerning simulations of radiation treatments, and methodologies for therapy optimizations. Our simulator represents a novel methodology as TCP is calculated without analytical formulas, but based on its own probabilistic definition.

Radiation Oncologists' Approach to Internal Mammary Lymph Node Radiotherapy in Breast Cancer: The Turkish Society for Radiation Oncology Breast Cancer Study Group (TROD 06-005 Survey Study).

BackgroundThis study aimed to examine the practice patterns of radiation oncologists in Turkey regarding radiotherapy to the regional lymph nodes, including internal mammary lymph nodes (IMNs), and identify the factors influencing their clinical decisions in breast cancer patients.MethodsA nationwide, 19-point questionnaire was sent to the physician members of the Turkish Society for Radiation Oncology (TROD).ResultsIn total, 165 radiation oncologists completed the survey, corresponding to a 27% response rate. Regional radiotherapy was used in 64.2% of the patients with 1–3 axillary lymphatic involvement and unfavorable prognostic factors. In contrast, 61.2% of the respondents indicated that IMN should be included in the target volume for regional radiotherapy when the patient had one positive node after axillary lymph node dissection (ALND) in the inner quadrant and central region tumors. However, 71.5% of the respondents chose to include the IMN in the non-inner quadrant and non-central region tumors for patients with four or more positive nodes after ALND. The decision to offer internal mammary lymph node radiotherapy (IMNRT) varied widely and significantly among respondents, years in practice, and the rates of dedicating their clinical time to patients with breast cancer.ConclusionThe results of this survey revealed significant national variation in attitudes regarding the treatment of IMN. Thus, this study may also help document the impact of future studies on clinical practice.

Double-pulse laser micro sintering: Experimental study and mechanism analysis aided by in-situ time-resolved temperature measurements

Laser micro sintering (LMS) is a process of manufacturing microscale parts and/or features by laser sintering. Small powder particles (e.g., on the order of ~1 μm) are often used for good spatial resolutions. Besides, pulsed lasers are often employed due to related potential advantages. For good mechanical properties, pulsed laser-based LMS typically desires high densification of sintered material, which is, however, often more difficult to achieve than conventional macro selective laser sintering or melting. A new double-pulse laser micro sintering (DP-LMS) process was recently proposed by the corresponding author, which is a novel approach to potentially achieve good densification of sintered material in pulsed laser-based LMS. It employs laser pulse groups, each of which contains “sintering laser pulse(s)” followed by “pressing laser pulse(s)” at a certain delay time, which are used to sinter (melt and coalesce) the powder particles and generate a high transient pressure onto the material, respectively. This paper reports a study of the DP-LMS process for single-track sintering. The related fundamental mechanisms are analyzed with the help of in-situ time-resolved measurements of powder bed surface temperatures during DP-LMS. Under the conditions studied, it has been found that DP-LMS can produce better sintering results than those by LMS only using the sintering or pressing laser pulses. For a good sintering result in DP-LMS, the “pressing laser pulse” needs to have a sufficiently high intensity and follow the last preceding “sintering pulse” close enough such that the irradiated surface region is still in a molten state (or partially so to a sufficient extent). The fundamental mechanism for good sintering results in DP-LMS is expected to be that the “pressing laser pulse” can induce (likely via laser ablation and plasma generation) high pressures on the powder bed surface, which can promote melt flow, reduce balling and/or enhance material densification and/or continuity. In addition, a thermal accumulation effect between adjacent “sintering laser pulses” during DP-LMS has been revealed by the in-situ temperature measurements.

Investigation of elimination of powder spreading in manufacture of thin and wide preheating beads from Co–Cr alloy powders using a P-ebeam

A preheating step consisting of the heating of substrates and powder particles is necessary to prevent spreading phenomenon of powders in an electron beam melting (EBM) process. The preheating step, however, increases the overall manufacturing time as well as the energy consumption of the EBM process. In addition, the preheating causes thermal damages of surrounding parts in the vicinity of the powder bed. These drawbacks are particularly notable when both thin and wide parts are fabricated from the EBM process. The present paper newly investigates the manufacture of thin and wide preheated beads from a plasma electron beam (P-ebeam) and a Co–Cr alloy with a low temperature heating of the substrate. The effects of process parameters, including the working distance of P-ebeam, the probe current of the P-ebeam and the travel speed of the table, on the formation of preheated beads are examined to obtain feasible preheating conditions. The influence of the probe current and the travel speed on heat transfer characteristics in the vicinity of the irradiated region by P-ebeam are investigated via finite element analyses to analyze the cause of the powder spreading and defects. Finally, suitable preheating methods are proposed to fabricate thin and wide preheated beads through the elimination of the powder spreading.

Diagnosis dan Penatalaksanaan Karsinoma Tonsil

AbstractTonsilar carcinoma is the most common squamous cell carcinoma of the tonsils that presents as ulcerated lesions on a necrotic basis. These tumors often appear at an advanced stage and often metastasize to the lymph nodes. In recent years, head and neck malignancies due to HPV infection have increased. Other causes of carcinoma of the tonsils are smoking and alcohol abuse. The overall incidence of tonsillar carcinoma increase in the younger population, and this may be associated with an increase of human papilloma virus infection. Tonsil carcinoma varies in clinical history. In the early stages, tonsilar carcinoma are asymptomatic, but at an advanced stages patients might have complaint of a persistent sore throat, unilateral otalgia, or a sensation of mass in the throat, bleeding from the mouth, fetor oris with trismus as a sign of a local invasion. The diagnosis of tonsilar carcinoma made based on history, physical examination, clinical symptoms, and supporting examinations such as of CT scan, MRI and tumor tissue biopsy. Management of tonsilar carcinoma for stage I-II and stage III (T1-2, N1) are local and regional radiotherapy to achieve a good effect. Radiotherapy is the main treatment modality in early-stage of tonsillar carcinoma. concomitant chemotherapy and radiation therapy are the standard treatment for advanced tonsillar carcinoma currently. chemotherapy can be given before radiotherapy or as neoadjuvant, given after radiotherapy or as adjuvant, or given concurrently with radiotherapy.

Is Radiation, Sentinel Lymph Node Biopsy, or Neck Dissection Beneficial for the Node Negative Neck in Merkel Cell Carcinoma?

Is Radiation, Sentinel Lymph Node Biopsy, or Neck Dissection Beneficial for the Node Negative Neck in Merkel Cell Carcinoma?

Synaptic Plasticity Powering Long-Afterglow Organic Light-Emitting Transistors.

Long-lasting luminescence in optoelectronic devices is highly sought after for applications in optical data storage and display technology. While in light-emitting diodes this is achieved by exploiting long-afterglow organic materials as active components, such a strategy has never been pursued in light-emitting transistors, which are still rather unexplored and whose technological potential is yet to be demonstrated. Herein, the fabrication of long-afterglow organic light-emitting transistors (LAOLETs) is reported whose operation relies on an unprecedented strategy based on a photoinduced synaptic effect in an inorganic indium-gallium-zinc-oxide (IGZO) semiconducting channel layer, to power a persistent electroluminescence in organic light-emitting materials. Oxygen vacancies in the IGZO layer, produced by irradiation at λ= 312nm, free electrons in excess yielding to a channel conductance increase. Due to the slow recombination kinetics of photogenerated electrons to oxygen vacancies in the channel layer, the organic material can be fueled by postsynaptic current and displays a long-lived light-emission (hundreds of seconds) after ceasing UV irradiation. As a proof-of-concept, the LAOLETs are integrated in active-matrix light-emitting arrays operating as visual UV sensors capable of long-lifetime green-light emission in the irradiated regions.

Towards real-time PGS range monitoring in proton therapy of prostate cancer

Proton therapy of prostate cancer (PCPT) was linked with increased levels of gastrointestinal toxicity in its early use compared to intensity-modulated radiation therapy (IMRT). The higher radiation dose to the rectum by proton beams is mainly due to anatomical variations. Here, we demonstrate an approach to monitor rectal radiation exposure in PCPT based on prompt gamma spectroscopy (PGS). Endorectal balloons (ERBs) are used to stabilize prostate movement during radiotherapy. These ERBs are usually filled with water. However, other water solutions containing elements with higher atomic numbers, such as silicon, may enable the use of PGS to monitor the radiation exposure of the rectum. Protons hitting silicon atoms emit prompt gamma rays with a specific energy of 1.78 MeV, which can be used to monitor whether the ERB is being hit. In a binary approach, we search the silicon energy peaks for every irradiated prostate region. We demonstrate this technique for both single-spot irradiation and real treatment plans. Real-time feedback based on the ERB being hit column-wise is feasible and would allow clinicians to decide whether to adapt or continue treatment. This technique may be extended to other cancer types and organs at risk, such as the oesophagus.

Selective metallization on glass surface by laser direct writing combined with supersonic particle deposition

Selective metallization on glass surface technique has lot of potential applications in optoelectronics. Particularly, ultra-fine copper lines provide better optical transparency, which may enable to meet the demands of novel optoelectronic devices. In this paper, we propose a new manufacturing procedure to overcome the limitations of the traditional process and to achieve narrower copper lines on the glass surface. We, first, irradiate the glass surface by the femtosecond laser for more precise ablation, and then deposit the silver nitrate particles onto the irradiated region by using a supersonic particle deposition system. Copper lines with a linewidth of 1 µm were achieved by means of this new procedure, which is, to best our knowledge, the narrowest linewidth ever reported so far using laser direct writing and the subsequent electroless copper plating. We also demonstrate a highly transparent heater (i.e., 97% optical transparency) as an application of the proposed manufacturing approach.

Controlled and deterministic creation of synthetic antiferromagnetic domains by focused ion beam irradiation

We study layered synthetic antiferromagnets (SAFs) with out-of-plane interface anisotropy, where the layer-wise antiferromagnetic (AF) alignment is induced by interlayer exchange coupling (IEC). By applying low energy He+ focused ion beam irradiation to the SAF, a depth-dependent reduction of the IEC and anisotropy can be achieved due to layer intermixing. As a consequence, after irradiation, a specific field reversal sequence of the SAF is energetically preferred. When tuning the pristine SAF to exhibit an inverted field reversal, we are thus able to create AF domains in the irradiated regions. When irradiated with a fluence gradient, these AF domains can be further deterministically manipulated by an external magnetic field. Among other applications, this could be utilized for engineering a controllable and local magnetic stray field landscape, for example, at AF domain walls, within the otherwise stray field free environment provided by the SAF.

Human Serum Albumin-Oligothiophene Bioconjugate: A Phototheranostic Platform for Localized Killing of Cancer Cells by Precise Light Activation.

The electronic, optical, and redox properties of thiophene-based materials have made them pivotal in nanoscience and nanotechnology. However, the exploitation of oligothiophenes in photodynamic therapy is hindered by their intrinsic hydrophobicity that lowers their biocompatibility and availability in water environments. Here, we developed human serum albumin (HSA)–oligothiophene bioconjugates that afford the use of insoluble oligothiophenes in physiological environments. UV–vis and electrophoresis proved the conjugation of the oligothiophene sensitizers to the protein. The bioconjugate is water-soluble and biocompatible, does not have any “dark toxicity”, and preserves HSA in the physiological monomeric form, as confirmed by dynamic light scattering and circular dichroism measurements. In contrast, upon irradiation with ultralow light doses, the bioconjugate efficiently produces reactive oxygen species (ROS) and leads to the complete eradication of cancer cells. Real-time monitoring of the photokilling activity of the HSA–oligothiophene bioconjugate shows that living cells “explode” upon irradiation. Photodependent and dose-dependent apoptosis is one of the primary mechanisms of cell death activated by bioconjugate irradiation. The bioconjugate is a novel theranostic platform able to generate ROS intracellularly and provide imaging through the fluorescence of the oligothiophene. It is also a real-time self-reporting system able to monitor the apoptotic process. The induced phototoxicity is strongly confined to the irradiated region, showing localized killing of cancer cells by precise light activation of the bioconjugate.

Spin waves excitation at micron-sized, anisotropy modified regions in amorphous Fe80B20 stripes: Local properties and inter-regions coupling

We report on the measurement of the local magnetization dynamics occurring, at units of GHz, in large aspect ratio stripes lithographed from reduced damping amorphous Fe80B20 films. The stripes were submitted to local anisotropy modifications by micrometric beam synchrotron X-ray irradiation. Our results include data on the dispersion relationships and group velocities corresponding to spin waves excited at both the non-irradiated and the irradiated regions. Whereas in the former case we observed standing spin waves with transverse-to-the stripe axis wave vector, in the latter one, for which the wave vector of the spin waves was parallel-to-the stripe axis, propagating spin waves were excited. In both regions, we measured the effective propagation distance of the spin waves, which resulted to be independent of the wave vector orientation. In the spin waves excited at the irradiated region, we also measured the decay time and effective damping coefficient, which was in good agreement with previously reported values obtained from FMR measurements in amorphous Fe80B20 continuous films. We show that the interaction of the non-irradiated and irradiated zones results, at the stripe transverse saturation remanence and under an exciting field frequency of 4 GHz, in the introduction of a π phase shift between the standing spin waves excited at both sides of the irradiated region. This result opens the possibility of using the local, transverse to the stripe axis, magnetic anisotropy easy axis induced by the X-ray irradiation as a crucial constituent of a zero-applied field spin wave phase-shifter.