Sajjad Ahmed Memon

8 Questions 31 Answers 0 Followers

Questions related from Sajjad Ahmed Memon

What should the minimum Dose Rate of Co-60 at which source must be changed?

Hello All researchers of Health/Medical/Radiation Physics, at what Dose Rate of Co-60 teletherapy source should be replaced? I have searched but find NAND! Is any IAEA, AAPM...

09 February 2020 2,311 7 View

A patient with uncompleted radiotherapy, LAMA for some period. How we compensate the remaining dose?

1. A patient has uncompleted radiotherapy say 10 fractions out of 30 (2Gy/fraction), how we compensate/manage the remaining dose in following situations? i) LAMA/absent for 15 days. ii)...

04 November 2015 9,225 2 View

Is ALARA principal can be applied on non-ionizing imaging (Ultrasound, Magnetic Resonance Imaging)?

Can ALARA principal be applied on non-ionizing imaging like Ultrasound (US) and Magnetic Resonance Imaging (MRI)? Is there any role of ALARA in US and MRI?

02 August 2015 2,729 6 View

Why the surface dose of X-rays is much much less than same energy electrons in LINAC?

In LINAC, the surface dose of X-rays is about 30-40% for particular energy whereas same energy electrons enter in tissue with about 70-80%. Why this different behavior is seen for same energy...

09 July 2015 6,326 12 View

Is it possible that 6 MV photons can be produced by 6 MeV electrons or lesser energy than 6 MeV in LINAC?

Can we produce the photon of same energy of electron in LINAC? Low or equal energy photon can be produced by the same energy of electron but can photon of high energy be produced with low energy...

03 February 2014 1,498 4 View

What is the difference between MeV and MV?

For photon emitting isotopes we are using MeV but for photons produced in LINAC, we are using MV instead of MeV. Similarly for electrons in LINAC, MeV is being used. Why?

03 February 2014 2,441 9 View

Treatment of a small skin lesion with Sr-90 Eye Applicator

Is it possible that we can treat a small skin lesion with an Sr-90 ophthalamic applicator? If yes then what about the lesions which are a little larger than the applicator size?

22 March 2013 9,154 2 View

Dosimetry of Sr-90 Beta Applicator

How do we measure the dose rate of Sr-90 Beta Applicator? Which Dosimetry equipment is required for the dose rate measurement? In case of non availablity of such dosimetry unit, how is this...

09 November 2012 1,485 1 View