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Main Author:	Patrícia Rebello
Format:	Artículo científico
Language:	en
Published:	Sociedade Brasileira de Física 2004
Subjects:	Física, Astronomía y Matemáticas
Online Access:	https://www.redalyc.org/articulo.oa?id=46434562
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Nuclear Fragmentation in Protontherapy Patrícia Rebello Mahir S. Hussein Física, Astronomía y Matemáticas The procedure followed by the Laborat´orio de Metrologia Nuclear (LMN) at the IPEN, in Sao Paulo, for thestandardization of the 45Ca is described. The activity measurement was carried out in a 4¼¯-° coincidencesystem, by the tracing method. The radionuclide chosen as the ¯-° emitting tracer nuclide was 60Co becauseof its end-point beta-ray energy which is close to 45Ca. Six sources were prepared using a 1:1 ratio (¯-pure and¯-°) dropped directly on the Collodion film, and other two solutions of 45Ca + 60Co were mixed previouslyusing a 1:1 and 1:2 ratio before making the radioactive sources. The activity of the solution was determined bythe extrapolation technique. The events were registered using a Time to Amplitude Converter (TAC) associatedwith a Multi-channel Analyzer. 2004 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46434562 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.3A Vol.34

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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