Teletherapy 1

Posted on Sep 13, 2023 in Other subjects

IONIZING RAD Capac fotons or other particles to separate electrons with ‘q tomes with contact. all physical processes involve n ls transfer and / or processing power d Q Debno CONDITIONS MET D SUBSTANCE RADIO FOTONS * provide for q ua rad penetrating deep enough to react to dl agency can not provide 1 * denergía amount sufficient where vol is small (if the source has 1 spesor cnsiderable absorb 1 part of the rad, if the source does not have it does not absorb the rad and makes fakta 1 isotope absorption under the age cn) * No ad tner a period d xq dsintegración dmasiado short time is lost changing fuents * dbe not have other dangerous products. ISOTOPES USED * + Cs137 (pumps Cs) less penetrating the Co q 60 and his term d d dsintegracion is 30 years * Co 60 TERM ENERGY* Nl sntido classic, q 1 rdiacion pued enrgia dpositar in 1 white (target) s tatistics d the sum of many actions prticulas and cncepto of cnducira to “Dose absorbda” * nl sntido d dterminada energy, energy cracteriza q trnsprta 1 particle d sta rdiacion. enrgia s sta Mev CO59 Xpresa n * has 1 core is not stable radioactive q * Simply add 1 neutron to the nucleus to activate * obtained is not stable, cn tndencia to fragment spontaneously to evolve stable products are obtained products q d Co60 decay of Ni60 * q * is a stable substance to it there are 3 issues: 1) beta-rays: electron energy of 312 Kev 2) emission of 1.17 MeV gamma 3) gamma emission of 1.33 Mev (1.25 Mev of average) Co machine devices * head – fixed to the arm and rotates about a horizontal axis * Arm – peromite head movement around the table d.In theratron the head rotates about an axis fixed to the arm horiz, to radiate the patient without moving d d d fuents his stretcher stored cobalt * n * recipents cylindrical dimensions 2x2cm: Disponr d d activity were high enough source pra q ls tratamients n durn dmasiad absorption grnde pra avoid 1 d dmasiado intense radiation inside qs producn n d q have tdo through thickness d l d is the height. N tner dnominado grand diameter d because the shadows and use finalmnte n times d tner q nl reactr activation and expensive nuclear dnominado lrgos source pra produce radioactive sources BENEFITS D * does not have breakdowns and feel more confident with q * the source accelerators is fair to address the issue of the rad x frmado everywhere COLLIMATOR * d cnjunto sheets x 1, d 1 psad very absrbent tungsten material separated manualment x engines or equipped with reticles d * d steel wire placed in the beam axis of irrad (center beam) d 1 can be rotated around the axis motorized and manual in theratron alcyonIsocenter When the head is not rotated relative to the arm cn beam axis intersects the axis dl arm at one point. is at an invariable distance from the source (isocentric distance) * for devices d Co60 is 80cm * 100cm accelerators TYPES OF TWILIGHT IN THE PUMP Co60 * GEOMETRIC-beam at the edges dl d 1 zone is observed that transmission dsd completament can not be the source. the variation of TD remains until l cte rise d dl eclipse the source, then decreases along progresivament d cnsiderable an area about the beam dimensions dl. * TRANSMISSION-the remains of q rad get through the collimator and not absorb x puedn full fotons q to2 out the source * d DISSEMINATION the rad-q is produced in the collimator face interac tions dbid to beam 1 CONSECUANCIAS D THE TWILIGHT * ensures a beneficial effect on transition d d edges of treated areas * reduced dose is lower and the shadows is uselessEQUIPMENT LIMITATIONS Co * source-skin distance 80cm: do not get d-dimensional fields q in theratron exceed 35x35cm. the irrad vol de grands have trouble to frame the fields d hese limits. is necessary to avert the patient from the source x lo q amending the beam characteristics and dosimetry complicates and increases the duration. * fuents rad the high rate can not exceed certain limits (if e is d long-term treatment, triempos prohibitive) type braking photons rad d providing an accelerator beams. can have all kinds of energy HEAD COMPONENTS THROTTLE 1) paketesd d electrons 2) some stragglers + or – trapped x phases slowed, have 1 less than the d vel good electrons 3) the electrons are arrank2 x beam over the holes, others come out of the window d q interactions as causes electrons get to select the same vel q tngan on the acceleratorcabzal this happens n dl accelerator. is passed on the small beam x ntrehierro d 1 q electrohimán powerful forces electrons to move under 1 circular path for q serves equalizer cone manufactured d 1 d lead alloy brought in tryecto of fotons, 1 max d absorbs energy in the axis direction of q coincides cn the beam axis of the advantages and disadvantages with respect to Co accelerators accelerators are complex machines + * ADVANTAGES 1) dose rates do not decrease the activity d cn source 2) + high dose rate d 3) get large fields + 4) have the x-rays and electrons palette * DISADVANTAGES 1) susceptible to breakdowns 2) + state Delk comprobaciónb often 3) throttle price higher than that of Co.