"Laser Beam Breakthrough: Revolutionizing Cancer Treatment with High-energy Electrons"
Ultrafast laser technology is a significant advancement in the field of medicine, particularly in cancer treatment. Scientists at the "Institut national de la recherche scientifique" (INRS) and McGill University Health Centre in Montreal, Canada, have made a groundbreaking discovery. They have shown that powerful laser pulses can be utilized to accelerate electrons to energy levels similar to those used in radiation therapy.
The term "powerful laser pulses" refers to concentrated bursts of intense light emitted by a laser device. These bursts are highly energized and can be precisely targeted at specific cells or tissues during medical treatments. The high energy of these pulses allows the electrons to move faster and reach the desired levels necessary for medical purposes.
Remarkably, this electron source's strength lies in its simplicity. By employing just one lens in a regular air environment, a concentrated beam of electrons can be generated. Astonishingly, this electron beam is capable of delivering an entire year's worth of radiation dose in less than a second to someone standing just one meter away.
The concept of "one lens in regular air" implies that only a single optical component, like a lens, is used in a normal atmospheric setting without any specialized conditions or additional equipment. The laser pulses, focused through the lens, interact with a target, leading to the emission of electrons. The lens plays a crucial role in shaping and directing these emitted electrons into a focused beam, much like a magnifying glass concentrating sunlight onto a specific point.
Key Features
The key discovery is that a laser beam focused in ambient air can generate a plasma, which in turn can accelerate electrons to megaelectronvolt (MeV) levels. This is a substantial increase from the previously known limit of a few kiloelectronvolts (keV).
"The director of the EMT Centre at INRS, François Légaré, stated that for the first time, they have shown that a laser beam tightly focused in ambient air can accelerate electrons, allowing them to reach energies in the MeV (megaelectronvolt) range. This energy level is comparable to the irradiators used in cancer radiation therapy."
Flash Radiotherapy
High-energy electrons generated using this laser technology could be crucial in a cutting-edge cancer treatment called FLASH radiotherapy. This method aims to treat challenging tumors more efficiently while minimizing harm to nearby healthy tissues.
The researchers have found that the FLASH effect, although not fully understood, appears to involve a quick reduction of oxygen in healthy tissues. This reduction makes these tissues less sensitive to radiation, which can help protect them during cancer treatment.
Safer Practises
The researchers at INRS and MUHC highlight that their discovery is not only important for medical purposes but also emphasizes the need for safer laboratory practices. The laser beams used in this research can produce high levels of radiation that can be harmful to health.
The high energies of the electrons (MeV) observed in this research enable them to travel a significant distance, over three meters in air or several millimeters beneath the skin. This poses a risk of radiation exposure for those using the laser source.
Additionally, when the team measured the radiation near the source, they found that the electron doses were much higher, three to four times greater than those typically used in regular radiation therapy. This discovery emphasizes the need for safer practices in laboratories to protect researchers and staff.
Improved radiation treatments
The study paves the way for more research on the FLASH effect in cancer treatment and the creation of better methods to combat the disease. It demonstrates how scientific research can have practical and life-saving applications.
Although the nature of the FLASH effect is still not fully understood, the electrons produced using this laser technology have similar characteristics to those used in FLASH radiotherapy. This similarity suggests that our method of focusing the laser in regular air could help researchers study and potentially harness the benefits of FLASH effect in cancer treatment.
Once we have better control over the radiation source, additional research can be conducted to understand what exactly causes the FLASH effect. This understanding will then help us develop improved radiation treatments for individuals battling cancer, ultimately offering them more effective and targeted care.
Girish Linganna, Aerospace & Defence Analyst
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Putin meets Iran's FM Araghchi, says Russia ready to do its best to help bring peace to West Asia
Moscow (PTI): Iran's Foreign Minister Abbas Araghchi on Monday met Russian President Vladimir Putin, who hailed the Iranian people for fighting bravely and heroically for their sovereignty and said Moscow is ready to do its best to help bring peace to West Asia as soon as possible.
Araghchi, who held talks with Omani and Pakistani leadership before arriving in Russia, met Putin in St. Petersburg and thanked him for supporting Iran, state-owned TASS news agency reported.
"Russia is ready to do everything in its power to ensure that peace in the Middle East is achieved as soon as possible," Putin said during his meeting with Araghchi, which was also attended by Russian Foreign Minister Sergey Lavrov.
Revealing that he received a message from Iranian Supreme Leader Mojtaba Khamenei last week, Putin asked Araghchi to convey his "gratitude for this message and best wishes for his health and well-being."
He praised the Iranian people for fighting "bravely and heroically" for their sovereignty, Iran's state-run PRESS TV reported.
"We really hope that, based on the courage and desire for independence, the Iranian people, under the guidance of the new leader, will weather this difficult period of trials and peace will come,” Putin said.
He also stressed that Russia “intends to maintain” its strategic relations with Iran.
Araghchi said that the world witnessed Iran’s strength in countering the US during the recent war, and that the Islamic Republic is a "stable and powerful establishment."
"With their courage, the Iranian people succeeded in resisting the US aggression and will be able to endure it,” he said.
He said that it became clear that Iran has “great friends and allies” like Russia, and conveyed “warmest greetings” from Supreme Leader Mojtaba Khamenei and President Masoud Pezeshkian to the Russian leader.
Araghchi said relations between Moscow and Tehran represent a “strategic partnership at the highest level” and will continue to develop "regardless of circumstances."
"We are grateful to you for the solid and strong positions in support of the Islamic Republic of Iran," he said.
Foreign Minister Lavrov said that the talks between President Putin and the Iranian Foreign Minister were "useful and constructive."
Kremlin Spokesman Dmitry Peskov later said that Russia is "ready to provide any good offices, any mediation services that are acceptable to the parties."
"We will be ready to do everything so that ultimately peace ensues, guaranteed peace, and that there is no return to hostilities," Peskov was quoted as saying by TASS.
He was asked how Moscow can assist in future negotiations on the Iranian settlement.
Araghchi arrived in Russia after his whirlwind trip to Islamabad, which, according to him, was “very productive” and involved “good consultations" with Pakistan's Army Chief Field Marshal Asim Munir, amid uncertainty over the second round of peace talks to resolve the war in West Asia.
"We held good consultations with our friends in Pakistan. The trip was successful. We assessed the outcome of our recent (meetings) and discussed in what direction and under what conditions talks can move on,” Araghchi said in a video posted on his Telegram channel upon his arrival in St Petersburg.
Referring to the second round of talks between the US and Iran to resolve the conflict in West Asia, Araghchi said: "Developments have taken place in the negotiations."
"Despite some progress in earlier rounds, the talks failed to reach their objectives due to the Americans' approach, the excessive demands they made, and the wrong approaches they adopted. Therefore, it was necessary to consult with our friends in Pakistan to review the latest situation,” Iran's official news agency IRNA quoted him as saying.
He said that the trip to Pakistan was a good opportunity to review developments related to the US-Israeli war against Iran, expressing confidence that “these consultations and coordination between the two countries will be highly significant.”
Araghchi arrived at St. Petersburg's Pulkovo Airport early Monday, where he was welcomed by Russian officials and Iran’s ambassador to Russia, Kazem Jalali, the report said.
The first round of peace talks between Iran and the US, held on April 11 and 12, failed to bring the desired result for the parties to the conflict.
The Iranian minister arrived in Islamabad for the second time on Sunday after a short visit to Oman, where he held talks with Sultan Haitham bin Tariq al-Said on security in the Strait of Hormuz and diplomatic efforts to end the Iran-US conflict.
After Araghchi left Pakistan for Oman on Saturday, President Donald Trump announced that US negotiators Steve Witkoff and Jared Kushner would no longer be going to Islamabad for talks with Iran, contending that Washington held all the cards on the matter.
Trump on Sunday reiterated that the US and Iranian officials can talk by phone for a peace solution to the conflict.
On Tuesday, Trump extended the two-week ceasefire with Iran indefinitely to give Tehran more time to prepare a unified proposal to end the war, just hours before the truce was set to expire.
The war began when the US and Israel jointly attacked Iran on February 28, killing Iranian Supreme Leader Ayatollah Ali Khamenei and several top commanders. The retaliation by the Islamic Republic extended the war to the entire Gulf region.
