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AbstractAbstract
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Original Title
Fachbegriffe zur Radioaktivitaet
Primary Subject
Source
ARN: DE19860091865; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Allgemeine Forstzeitschrift; ISSN 0002-5860;
; v. 41(29); vp

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AbstractAbstract
No abstract available
Original Title
Fachbegriffe zur Radioaktivitaet
Primary Subject
Source
ARN: DE19860091863; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Allgemeine Forstzeitschrift; ISSN 0002-5860;
; v. 41(28); vp

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AbstractAbstract
[en] In June 1975, the General Conference on measures and weights has internationally introduced the names of unit Gray for the activity of a radioactive substance. The reasons for this change - the valid units so far were Rad and Curie - and the international activities with regard to a general acceptance of these new units are reported on. (orig./AK)
[de]
Die Generalkonferenz fuer Masse und Gewicht hat im Juni 1975 die Einheitennamen Gray fuer die Energiedosis und Becqerel fuer die Aktivitaet einer radioaktiven Substanz international eingefuehrt. Ueber die Gruende fuer diese Aenderung - die bisher gueltigen Einheiten heissen Rad und Curie - und ueber die internationalen Bemuehungen um die Tragfaehigkeit der neuen Regelung wird berichtet. (orig.)Original Title
Die neuen radiologischen Masseinheiten Gray und Becqerel
Primary Subject
Source
1 tab.; 5 refs.
Record Type
Journal Article
Journal
Medizinische Welt; v. 26(44); p. 1993-1995
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AbstractAbstract
No abstract available
Original Title
Warum gibt es Becquerel und ips?
Primary Subject
Source
ARN: DE19870036707; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Forst- und Holzwirt; ISSN 0015-7961;
; v. 41(15); vp

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AbstractAbstract
[en] The research of the distribution of the absorbed dose along the perimeter and length of the polymer protective sheath on the basis of a halogen-free composition depending on the technological dose of radiation exposure of shipboard cable samples was performed. It has been established that irregularity of irradiation around the cable perimeter can reach 20…30% with a technological dose in the range of 1.25…0.5. The irradiation along the cable is more uniform and does not exceed 5% at a technological dose in the range of 1.25…0.567. With a reduction in the technological dose, the irregularity of radiation around the perimeter and length of the cable increases. It is established that with an average absorbed dose of 210 kGy, the protective polymer shell does not meet the requirements of the standard for relative elongation at break. Optimal and physical-mechanical characteristics of the polymer shell made of halogen-free material are provided under irradiation in the range of the absorbed dose of 160 to 170 kGy. (author)
Original Title
Raspredelenie pogloshchennoj dozy po perimetru i dlinne polimernoj zashchitnoj obolochki pri radiatsionnom obluchenii sudovogo kabelya
Primary Subject
Record Type
Journal Article
Journal
Voprosy Atomnoj Nauki i Tekhniki; ISSN 1562-6016;
; (no.5-123); p. 44-48

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Craft, David; Khan, Fazal; Young, Michael; Bortfeld, Thomas, E-mail: dcraft@partners.org2016
AbstractAbstract
No abstract available
Primary Subject
Source
S0360-3016(16)32912-1; Available from http://dx.doi.org/10.1016/j.ijrobp.2016.07.033; Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
International Journal of Radiation Oncology, Biology and Physics; ISSN 0360-3016;
; CODEN IOBPD3; v. 96(4); p. 913-914

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Alahmad, Haitham N; Park, Ji-Yeon; Potter, Nicholas J; Lu, Bo; Yan, Guanghua; Liu, Chihray; Li, Jonathan G, E-mail: lijong@shands.ufl.edu2019
AbstractAbstract
[en] A sliding-window (SW) methodology for VMAT dose calculation was developed. For any two adjacent VMAT control points (CPs) n and n+1, the dose distribution was approximated by a 2-CP SW IMRT beam with the starting MLC positions at CP n and ending MLC positions at CP n+1, with the gantry angle fixed in the middle of the two VMAT CPs. Therefore, for any VMAT beam with N CPs, the dose is calculated with N-1 SW beams. VMAT plans were generated for ten patients in Pinnacle using 4° gantry spacing. For each patient, the VMAT plan was converted to a SW IMRT plan and dose was re-calculated. Another VMAT plan, with 1° gantry spacing, was created by interpolating the original VMAT beam. The original plans were delivered on an Elekta Versa HD and measured with Mapcheck2 using an in-house developed subarc method. For both the isodose distribution and DVH, there were significant differences between the original VMAT plan and either the SW or the interpolated plan. However, they were indistinguishable between the SW and interpolated plans. The average passing rate between the original VMAT plan and measurements was 84%. For both the interpolated and SW plans, the average passing rate was 96%. We conclude that the proposed SW approach improves VMAT dose calculation accuracy without increase in dose calculation time. (paper)
Primary Subject
Secondary Subject
Source
IC3DDose: 10. International Conference on 3D Radiation Dosimetry; Kunshan (China); 16-19 Sep 2018; Available from http://dx.doi.org/10.1088/1742-6596/1305/1/012065; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Literature Type
Conference
Journal
Journal of Physics. Conference Series (Online); ISSN 1742-6596;
; v. 1305(1); [5 p.]

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Reference NumberReference Number
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Fomintseva, M.; Bochkareva, T.; Grischuk, D., E-mail: maria.fomintseva@gmail.com
International Conference on Advances in Radiation Oncology (ICARO). Book of extended synopses2009
International Conference on Advances in Radiation Oncology (ICARO). Book of extended synopses2009
AbstractAbstract
[en] Full text: IMRT planning supposes us to use as large amount of fields and field segments with complex shapes and segments with screened isocentre. This involves certain demands to the treatment planning system (TPS) dose calculation algorithm and brings us to a necessity of additional control. While introducing IMRT into practice we encountered some problems. In our Center we have the linear accelerator Elekta Precise Digital with 1 cm at isocentre MLC, TPS Precise Plan with facility to create IMRT plans, and standard dosimetric equipment: water and solid water phantoms, Keithly dosimeter with ionization chamber and a set of radiographic films. With the advent of the ability to create sophisticated dose distributions, requirements on accuracy of target and definition of critical structures increased. To combine the CT, MRI, PET, etc. data one needs special fusion programmes. Such programmes can be delivered by a TPS vendor or sold separately. In addition to the dose to point prescription dose-volume constrictions for target and critical structures appeared. They are described by so-called cost function. Dose in a point of beam intersection may differ from dose in point of prescription. For example, ICRU 2008 recommends prescribing dose to a volume rather them to a point. This mismatching may need special attitude, perhaps specific forms of delivered dose registration. We have created a set of tests to check parameters of TPS important for IMRT. Fields with narrow fragments are often used in IMRT planning. Collimator scattering contribution increases in this case. The difference between absolute dose calculations and measurements was no more than 4%. The next problem concerned the TPS ability to calculate dose distribution from screened isocentre fields correctly. This is because dose distribution is usually calculated relative to isocentre dose, which in this case is negligibly small and consequently uncertain. We verified that TPS calculation agreed well with measurement. The difference was less than 1% in simple geometries and up to 5% in complex geometries with heterogeneity. To apply an IMRT plan to a patient, one needs to verify it beforehand. As a patient-specific test we chose to perform absolute dose measurements in several critical points for single multisegment field and total dose measurements in water phantom in vertical and horizontal mode for all beams. Good agreement of calculation and measurements led us to transit from 2-D to 3-D conformal radiotherapy and to begin introducing IMRT in our clinical practice. To use IMRT in clinical practice more extensively, we need to work out a patient-specific QA protocol. In spite of the absence of required equipment and software for this QA we consider the use of IMRT in clinical practice possible because we made a basic set of tests. (author)
Primary Subject
Source
International Atomic Energy Agency, Division of Human Health, Vienna (Austria); American Association of Physicists in Medicine (AAPM), One Physics Ellipse, College Park, MD (United States); American Brachytherapy Society (ABS), Reston, VA (United States); American Society for Radiation Oncology (ASTRO), Fairfax, VA (United States); European Society for Therapeutic Radiology and Oncology (ESTRO), Brussels (Belgium); International Association for Radiation Research (IARR), Radiation Biology Center, Kyoto University, Sakyo-ku (Japan); International Commission on Radiation Units and Measurements, Inc. (ICRU), Bethesda, MD (United States); Asia-Oceania Federation of Organizations for Medical Physics (AFOMP), Osaka University, Suita-city (Japan); Asociacion Latinoamericana de Terapia Radiante Oncologica (ALATRO), Cancun (Mexico); European Association of Nuclear Medicine (EANM), Vienna (Austria); European Federation of Organisations for Medical Physics (EFOMP), Udine (Italy); International Network for Cancer Treatment Research (INCTR), Brussels (Belgium); International Organization for Medical Physics (IOMP), Kogarah, NSW (Australia); Trans Tasman Radiation Oncology Group (TROG), Department of Radiation Oncology, Calvary Mater Newcastle, NSW (Australia); International Union Against Cancer (UICC), Geneva (Switzerland); 353 p; 2009; p. 192; ICARO: International Conference on Advances in Radiation Oncology; Vienna (Austria); 27-29 Apr 2009; IAEA-CN--170/156P
Record Type
Report
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AbstractAbstract
[en] Objective: In radiotherapy, it is important to conform the high dose volume to the planned target volume. A variable thickness paired wedge filter system was developed to compensate for dose inhomogeneity arising from field width segment variation in conformal irradiation. Materials and methods: The present study used a 6 MV linear accelerator equipped with multileaf collimator leaves and a paired wedge compensating filter system. The dose variation due to field width was measured in each field segment width. The variation in attenuation of the compensators was measured as a function of filter position. As the field width increases, the relative absorbed dose also increases; this is the point of requiring compensation, so it can be in reverse proportion. Results: As the field width increases, the relative absorbed dose also increases; this is why compensation is required and thus it must be in reverse proportion. Attenuation of the absorbed dose by the paired filters was in proportion to the filter position. The filter position to compensate for the difference of absorbed doses was defined by the square root of the field width. For a field varying in width from 4 to 16 cm, the variation in the absorbed dose across the field was reduced from 12% to 2.7%. Conclusion: This paired wedge filter system reduced absorbed dose variations across multileaf collimator shaped fields and can facilitate treatment planning in conformal therapy. (Copyright (c) 1998 Elsevier Science B.V., Amsterdam. All rights reserved.)
Primary Subject
Source
Country of input: Austria
Record Type
Journal Article
Journal
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AbstractAbstract
[en] Recently, the area of radiation usage is being enlarged by the industry's advancement over the world. And, the usage of radiation generator and radioisotope is increasing every year. So, they are researching actively how to protect operators from the radiation that causes direct or indirect harmfulness to radiation-related operators of the related institutions. Therefore, in case of operator's dose, not only the main dosimeter's correctness but also the reasonal evaluation to the read values becomes the important factor. From this view, LLD's application to the read dose value is being embossed more importantly than any other thing. So, this study tried to find out what change was generated in the personal dose and the group dose when LLD was applied based on the internal real operator's read value, for 3 years, 2005 - 2007, and find out the personal dose change after dividing them into the exposure group and the supervising group based on the common people's personal dose (1 mSv/y)
Primary Subject
Source
Korean Nuclear Society, Daejeon (Korea, Republic of); [1 CD-ROM]; Oct 2008; [2 p.]; 2008 autumn meeting of the KNS; Pyongchang (Korea, Republic of); 30-31 Oct 2008; Available from KNS, Daejeon (KR); 2 refs, 2 figs, 4 tabs
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Miscellaneous
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