Influence Of Radiation Field Research Articles

Triggering parametric-down conversion-based quantum key distribution via radiation field

We discuss the influence of radiation field on the secure key size and the maximum safety distance during QKD by using a set of photons produced via a spontaneous parametric-down conversion (SPDC) photon source. Four implementations that use multiple-photons and decoy states are discussed, these include nondecoy state, infinite active decoy state, passive decoy state with threshold detector and passive decoy state with perfect photon-number resolving detector. Results show that the radiation field significantly improves both the secure key size and the maximum secure communication distance. Therefore, the radiation field is found to be a good candidate to reduce unwanted interactions of photons with the quantum channel and hence, to increase the secure key rate and the maximum safety distance between legitimate users.

Investigation of the thermal state of an asynchronous motor with an asymmetric magnetic circuit

Modern technology for the processing of spent fuel assemblies (SFA) and radioactive waste (RW) is utilized in radiation protection cells. Under the conditions of exposure to high radiation fields, there is an intense destruction of various assemblies of actuators made of organic materials, including insulation of motor windings, which leads to frequent equipment failures requiring repair or replacement. Within the limits of the existing need, a project is being developed, with the purpose of creation of a radiation-resistant asynchronous electric motor with ceramic insulation for operation in. The proposed technical solutions make possible to increase the service life of the engine operating under the influence of radiation fields in radiation protection chambers by 4-5 times. Operation under an extreme condition requires an assessment of the engine itself. Considering a non-standard cooling system is of crucial importance for such projects.

Influence of radiation field on safety and efficacy for stage II/III esophageal cancer treated with definitive chemoradiotherapy: An exploratory analysis of JCOG0909.

104 Background: JCOG0909, a single-arm confirmatory trial of definitive chemoradiotherapy (dCRT) including salvage treatment, demonstrated promising efficacy and safety for cStage II/III (UICC-TNM 6th) esophageal cancer (EC) (Ito Y, ASCO 2018). Radiation (RT) fields included the elective regional lymph node during initial 41.4 Gy, such as bilateral supraclavicular fossae and superior mediastinal lymph nodes for upper thoracic (Ut), and mediastinal and perigastric lymph nodes for middle thoracic (Mt)/lower thoracic (Lt) EC. It is unclear whether the safety and efficacy are associated with the tumor location in patients with cStage II/III EC treated with dCRT. Methods: Patients who were enrolled in JCOG0909 and underwent dCRT were analyzed. Patients were categorized into three groups according to primary tumor location (Ut/Mt/Lt). We compared adverse events during dCRT, complete response (CR) rate, progression-free survival (PFS) and overall survival (OS) among groups. Results: Ninety-four patients (Ut/Mt/Lt: 16/59/19) were analyzed. The proportions of cStage IIA/IIB/III were 31%/44%/25% in Ut group, 20%/42%/37% in Mt group, and 21%/32%/47% in Lt group, respectively. The summary of safety and efficacy was listed in Table 1. Grade 3-4 leukopenia, neutropenia and thrombocytopenia were more frequently observed in Mt and Lt groups than in Ut group. CR rate was 63% in Ut, 63% in Mt, and 42% in Lt, respectively. 3-year PFS in Ut/Mt/Lt was 60%/59%/47% and 3-year OS was 73%/78%/58%, respectively. Conclusions: The RT field by the tumor location might be associated with efficacy and safety of dCRT for cStage II/III esophageal cancer. [Table: see text]

Microscopic model of second-harmonic generation in glass fibers

A microscopic model is given to explain the irreversible changes in glass fibers caused by simultaneous irradiation with 1064- and 532-nm light. The model involves an excitation of Ge E′ defects by photons of the fourth harmonic. A quantum-mechanical formalism is developed that is especially suited to describe a system under the influence of radiation fields.

Influence of radiation field and fractionation schedule of total lymphoid irradiation (TLI) on the induction of suppressor cells and stable chimerism after bone marrow transplantation in mice.

When BALB/c mice received 17 daily fractions of 2 Gy each of total lymphoid irradiation (TLI, total dose 34 Gy) and 30 X 10(6) C57 B1 bone marrow cells (BM) on the day after the last fraction, stable bone marrow chimerism without signs of graft-vs-host disease (GVHD) was obtained in 84% of the animals. On the contrary, in BALB/c mice receiving only seven fractions of TLI (total dose 14 Gy), all bone marrow grafts were rejected. When the last two fractions of a 14-Gy TLI course were given without shielding the extra lymphatic tissues (combined total lymphoid + total body irradiation, TLBI), chimerism could be induced in 53% of the animals. When this 14-Gy TLBI schedule was used, it was even possible to administer four fractions per day (multiple fractions per day schedule, MFD), thus reducing the overall treatment time to 2 consecutive days. After this concentrated form of TLBI, chimerism was detected in 35% of the animals. As in the 34-Gy TLI schedule, graft-vs-host reaction could not be prevented in the 14-Gy TLBI schedule when spleen lymphocytes (10 X 10(6) were added to the BM inoculum. Leucopenia or suppression of the phytohaemagglutinin (PHA)-induced blastogenesis could not predict which schedule would result in a successful allogeneic bone marrow take. Suppressor cells of the mixed lymphocyte reaction, on the other hand, were only found in the spleen of BALB/c mice treated with the TLI or TLBI schedules, which also resulted in stable bone marrow chimerism.

The neutrino theory of light

The standpoint assumed by Jordan is the following. Before the radioactive processes revealed the probability of the existence of the neutrinos, the only experimentally known wave fields were those which appear now as pure light fields. They turn out to be only a limiting case of a very much larger multitude of possible fields, which contain free (not compensated) neutrinos. The validity of this hypothesis could be experimentally tested by a study of a possible influence of radiation fields on the β-decay. If it is true that the β-emission is accompanied by an emission of a neutrino there should be an influence of an external neutrino field on the β-emission. But since light fields are nothing than neutrino fields (with neutrino pairs) we should also expect an influence of light radiation on the β-decay. The law of this interaction has yet to be calculated.