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Radiation Therapy · Modality & Technology
Electron Beam Therapy — Radiation That Stops Just Below the Skin
Medically reviewed by Dr. Kirti Ranjan Mohanty, Radiation Oncologist, MBBS · MD (Radiation Oncology), Senior Consultant · Last reviewed August 2026
An electron beam is chosen because it stops. It gives its dose in the first few centimetres of tissue and then runs out, leaving the lung, heart or spinal cord behind the target with almost nothing. That is why it is used for skin cancers, the chest wall after mastectomy and a boost to the lumpectomy scar — not because it is older or lesser technology.
- It stops on purpose — the useful depth is roughly the beam energy in MeV divided by three, so your physicist can make the dose end just past your target.
- Not a downgrade from X-rays — electron mode sits on the same modern linear accelerator as photon treatment; the machine is switched into it for surface targets.
- Fewer deep effects, a brisker skin reaction — organs behind the target get very little dose; the treated patch of skin takes more, so skin care matters from week one.
- Delivered at NABH-accredited partner centres — CION Cancer Clinics coordinates your treatment plan, your oncology team and your care throughout.
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The short answer
How is an electron beam different from an X-ray beam?
Electrons are charged particles with mass. X-rays are packets of pure energy. Electrons slow down, deposit their dose in the first few centimetres of tissue and then stop. X-rays pass through the whole body and exit the far side. That single difference decides which beam your team picks for your site.
Here is the whole physics in one paragraph. An electron carries an electrical charge, so it starts interacting with tissue almost immediately and loses energy quickly. It travels a short, fairly predictable distance and then runs out. Radiation oncology physicists use a working rule of thumb: divide the beam energy in MeV by about three, and you get the depth in centimetres that still receives roughly 80% of the prescribed dose. A 9 MeV beam therefore treats to about 3 cm and has effectively stopped by about 4.5 cm. An X-ray photon has no charge and no mass, so it slips deeper before it interacts, keeps going, and leaves an exit dose on the far side of the body. Neither beam is stronger than the other. They stop in different places, and that is the entire point.
So being offered an electron beam is not a sign that you are getting older or lesser technology. Electron mode sits on the same modern linear accelerator that delivers photon treatment; the machine is switched into it deliberately when the target is close to the surface and there is something underneath worth protecting.
Your radiotherapy is delivered at an NABH-accredited partner centre; CION Cancer Clinics coordinates your treatment plan, your oncology team and your care throughout.
Did you know?
Clinical electron beams on a modern linear accelerator are typically available somewhere between about 4 and 20 MeV, and the machine can switch between electron mode and X-ray mode for different patients on the same day. Because an electron beam’s useful depth is roughly its energy in MeV divided by three, your physicist can choose an energy that stops just past your target — a property that photon beams, which always carry an exit dose, do not have. Standard radiation-oncology physics reference, current as of August 2026.
Where it is actually used
Which conditions and body sites use electron beam therapy?
Electron beams are used where the target sits close to the surface. The common uses are skin cancers, the chest wall after mastectomy, a boost dose to the lumpectomy scar in breast conservation, superficial lymph nodes, keloid scars after excision, and whole-skin treatment for a rare skin lymphoma.
Skin cancer
Basal cell and squamous cell cancers
NCCN guidance lists radiation as a definitive option when surgery is not suitable or would be disfiguring — on the nose, eyelid, ear or lip, where an electron beam can cover a curved surface and stop.
Chest wall
After mastectomy
The chest wall is thin tissue lying directly over lung and heart. An electron beam can cover the scar and skin and stop before the lung, which is why it is often chosen for this site.
Scar boost
Tumour-bed boost after lumpectomy
After whole-breast radiation, ASTRO-aligned practice adds an extra dose to the surgical cavity for selected patients. An electron field aimed at the scar is one of the standard ways of delivering that boost.
Superficial nodes
Lymph nodes just under the skin
Node areas in the neck or above the collarbone often sit only a couple of centimetres deep, with the spinal cord behind them. Electrons treat the nodes and spare what lies further back.
Whole-skin technique
Total skin electron beam therapy
A specialised set-up that treats the entire skin surface, used for cutaneous T-cell lymphoma such as mycosis fungoides. It is offered at only a small number of centres in India.
Non-cancer use
Keloid scars after excision
A short electron course soon after a keloid is surgically removed is used in some centres to lower the chance of it growing back. Suitability is judged case by case by your treating team.
Electron beams are also used inside the operating theatre in a small number of centres, as intraoperative electron radiotherapy — a single dose delivered to the tumour bed while the wound is still open. If that has been mentioned to you, Intraoperative Radiotherapy (IORT): One Dose During Surgery explains what it involves.
Side by side
Electron beam vs X-ray (photon) beam — side by side
Both come out of the same linear accelerator. Neither is a better beam in general. Each row below is a real physical difference, and each one is worth asking your radiation oncologist about for your own site.
| Factor | Electron beam | X-ray (photon) beam |
|---|---|---|
| What the beam is made of | Charged particles that have mass | Uncharged packets of energy |
| How far it travels in tissue | Stops after a few centimetres — roughly energy in MeV divided by three gives the useful depth | Passes through the body and exits the other side |
| Usual treatment depth | Surface down to about 5 cm | Any depth, including deep pelvis and abdomen |
| Dose at the skin surface | High — the skin receives a large share of the dose | Lower — the peak dose sits a centimetre or more below the skin |
| Dose beyond the target | Essentially none once the beam has stopped | Tissue behind the target still receives an exit dose |
| Typical uses | Skin, chest wall, scar boost, superficial nodes, whole-skin lymphoma | Breast, lung, prostate, head and neck, brain, abdomen, pelvis |
| Machine used | Electron mode on a standard linear accelerator | Photon mode on the same linear accelerator |
| Shaping the field | A shaped metal cut-out placed close to the skin, often with a flexible sheet on the skin surface | Multileaf collimator leaves inside the machine head |
| Common short-term effect | Redness, dryness, itching and hair loss inside the treated patch of skin | Depends on which organs sit in the beam path |
| Session length on the couch | A few minutes; the beam itself runs well under a minute | Usually 10 to 20 minutes, longer for image-guided techniques |
| Cost pattern (indicative only, as of August 2026) | Priced by the number of sittings — ask for a written estimate | Priced by the number of sittings and the technique — ask for a written estimate |
| Delivered at | An NABH-accredited partner centre; CION Cancer Clinics coordinates the plan and the team | |
This table is a starting framework, not a treatment decision. Which beam suits you depends on your diagnosis, the depth and shape of the target and what sits behind it — ask your radiation oncologist how these rows apply to your own plan.
The honest answer
Are the side effects fewer with electron beam therapy?
Partly. Because the beam stops early, organs behind the target — lung, heart, bowel, spinal cord — receive very little dose, so those deeper side effects are largely avoided. But the skin itself takes a bigger share of the dose, so redness, dryness and peeling in the treated patch can be more noticeable than with a photon plan.
In other words, the side effects are not fewer in number. They are concentrated in a different place. The trade is a smaller dose to deep organs in exchange for a more visible skin reaction over the treated area. For a chest wall or a skin cancer on the face, most teams consider that trade a sensible one, which is exactly why the electron beam was selected.
Skin changes usually begin in the second or third week, peak around a week after the last sitting, and settle over the following few weeks. Hair inside the treated patch is commonly lost; it often regrows, though it may come back thinner, and after higher doses it may not return. Colour changes in the skin can last for months. Long after treatment, some people notice fine visible blood vessels or firmness in the treated area.
Nothing here is a reason to skip a review appointment. Skin reactions are managed far more easily when they are seen early, so tell your radiation therapist at your weekly check even if it looks minor.
Usually expected during the course
- Pink or red skin over the treated patch, appearing from around week two.
- Dryness, flaking, itching or a mild burning feeling in the same area.
- Loss of hair inside the treated field only, not elsewhere on the body.
- Darkening or lightening of the skin colour over the field.
- Tiredness, which is usually milder than with large photon fields.
Tell your team the same day
- Skin that breaks open, weeps fluid or peels wet rather than dry.
- Increasing pain, spreading redness beyond the marked field, or fever.
- A wound or scar in the treated area that starts to open or discharge.
- Any dressing, topical or rinse you are using that seems to be making the skin worse.
Use only what your radiation team has advised for the treated skin — a topical or a rinse they have prescribed for you, not something bought over the counter or recommended by a friend. Some ordinary skin products change how the surface dose behaves and are best avoided in the hours before a sitting. Ask your team before applying anything new.
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Understand your radiation plan before it starts
A radiation oncologist can review your scan and explain in plain language why an electron beam was chosen, how deep it goes and what to expect week by week — free, confidential, no commitment to start treatment.
On the day
What actually happens in an electron beam treatment session?
Planning happens once. After that, each daily sitting is short. Most of the time on the couch is spent lining you up, not treating.
- Planning and markingThe area to be treated is outlined on your skin, often with a thin wire laid along the edge during a planning scan so the outline shows up on the images. Small permanent or temporary marks keep the field in the same place every day.
- Choosing the energyThe medical physicist selects the beam energy in MeV so that the dose covers the full depth of your target and then falls away before whatever sits underneath it — lung, heart, cartilage or spinal cord. This is the step that makes an electron plan an electron plan.
- Making the cut-outA shaped metal cut-out is made to match your outline and fits into an applicator that comes close to the skin. It shapes the field to the treated area and shields the skin immediately around it.
- Adding a sheet on the skin, if neededA flexible sheet, called bolus, may be laid over the area. It pulls the maximum dose right up to the skin surface, which is deliberate when the disease involves the skin itself — and it is one reason the skin reaction can look brisk.
- The daily sittingYou lie still, the therapists line you up against the marks and step out, and the beam runs. The whole visit is usually a few minutes, and the beam itself is on for well under a minute. You feel nothing while it runs.
- Weekly reviewOnce a week your radiation oncologist checks the treated skin, adjusts skin care and reviews how you are managing. Raise anything that has changed, however small it seems.
Availability, stated plainly
Is electron beam therapy available in India and in Hyderabad?
Yes, for the standard uses. Almost every modern linear accelerator installed in India can switch into electron mode, so skin, chest wall, scar-boost and superficial-node electron treatment is widely available, including in Hyderabad. It is a routine, established technique, not something you need to travel for.
The specialised versions are a different matter, and it is worth being told the truth about them rather than finding out later. Total skin electron beam therapy, which treats the entire skin surface, needs a dedicated room set-up and calibration and is offered at only a small number of centres nationally. Intraoperative electron radiotherapy, delivered in the operating theatre, requires a mobile unit or a shielded theatre and is similarly limited to a few centres. If either has been suggested to you, ask specifically which centre would deliver it and how far you would need to travel.
At the far end of the scale, some particle techniques are simply not available in India at all. Carbon-ion therapy has no operating centre in India, and patients who are advised it must travel abroad; proton therapy exists at a very small number of Indian centres with long waiting lists. If a comparison of those options is what you are actually looking for, Carbon Ion Therapy vs Proton vs Photon sets out what is realistically reachable from here.
CION Cancer Clinics does not own or operate a linear accelerator, and CION is not itself NABH-accredited. Your radiotherapy is delivered at an NABH-accredited partner centre; CION coordinates your treatment plan, your oncology team and your care throughout, and can tell you before you commit exactly which centre would deliver your electron treatment.
Bring these to your consult
Questions worth asking before an electron beam course
These keep the conversation on your own anatomy rather than on technology names.
- How deep does my target go, and what sits directly behind it? — this is the reason an electron beam is or is not the right choice.
- What beam energy are you planning to use, and where will it stop? — a fair question, and your team can answer it from the plan.
- Will a bolus sheet be used on my skin? — it changes how brisk the skin reaction is likely to be.
- How many sittings will my course need? — get the number before you start, not after.
- What exactly should I put on the treated skin, and what must I avoid? — ask for it in writing at the first visit.
- Which centre will deliver my treatment, and is it NABH-accredited? — you are entitled to know where you will be treated.
- What is the indicative cost, and is it covered by my insurance or scheme? — ask for a written estimate before deciding.
You are allowed to ask why this beam
One conversation usually explains the whole plan
Whether you have been told “electrons”, “photons” or just “radiation”, a specialist can map out exactly what your own plan does and why it was built that way.
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Common questions
Electron beam therapy — your questions answered
How is electron beam therapy different from X-ray radiation?
Electrons are charged particles with mass; X-rays are uncharged packets of energy. An electron beam interacts with tissue straight away, gives up its dose over the first few centimetres and then stops, leaving almost nothing beyond that depth. An X-ray beam passes right through the body and delivers an exit dose on the far side. Physicists use a working rule that the useful depth of an electron beam in centimetres is roughly its energy in MeV divided by three, so a 9 MeV beam treats to about 3 cm. Both beams come from the same linear accelerator, switched into different modes. Neither is stronger; they stop in different places, and that is what decides which one suits your target.
Which cancers and conditions is electron beam therapy used for?
It is used where the target sits close to the surface. The common indications are skin cancers such as basal cell and squamous cell carcinoma, especially on the nose, ear, eyelid or lip; the chest wall after mastectomy; a boost dose to the surgical cavity after breast-conserving surgery; and lymph nodes lying just under the skin in the neck or above the collarbone. A specialised whole-body set-up called total skin electron beam therapy is used for cutaneous T-cell lymphoma such as mycosis fungoides. Electrons are also used in a non-cancer setting, as a short course after a keloid scar is surgically removed, and inside the operating theatre as intraoperative electron radiotherapy. Your own suitability is decided by your treating team from your scans.
Are the side effects of electron beam therapy fewer than with X-ray radiation?
Partly, and it is worth understanding the trade rather than being told simply yes. Because the beam stops early, organs behind the target such as lung, heart, bowel and spinal cord receive very little dose, so those deeper effects are largely avoided. In exchange, the skin over the treated area receives a larger share of the dose, so redness, dryness, itching and peeling in that patch can be more noticeable than with a photon plan, and hair inside the field is usually lost. Skin changes typically begin around week two, peak about a week after the last sitting and settle over the following weeks. Use only the topical or rinse your radiation team has prescribed, and report any skin that breaks open, weeps or becomes painful the same day.
How deep does an electron beam actually go?
Not far, and that is deliberate. The practical range depends on the energy chosen for your plan. A common working rule in radiation oncology physics is that the depth still receiving about 80% of the prescribed dose is roughly the beam energy in MeV divided by three, and the beam has effectively run out at about half the energy in centimetres. So a 6 MeV beam covers around 2 cm and stops by about 3 cm, while a 15 MeV beam covers around 5 cm and stops by about 7.5 cm. Clinical electron energies on a modern linear accelerator usually run between about 4 and 20 MeV. Your physicist picks the energy from your planning scan so that the dose covers the full thickness of the target and falls away before whatever lies underneath.
Is electron beam therapy available in India and in Hyderabad?
For the standard uses, yes. Almost every modern linear accelerator installed in India can switch into electron mode, so skin, chest wall, scar-boost and superficial-node treatment with electrons is widely available, including in Hyderabad, and there is normally no need to travel for it. The specialised forms are more limited: total skin electron beam therapy, which treats the whole skin surface, is offered at only a small number of centres nationally, and intraoperative electron radiotherapy needs a mobile unit or a shielded theatre and is similarly restricted. At the other extreme, carbon-ion therapy has no operating centre in India at all. CION Cancer Clinics does not own or operate a linear accelerator and is not itself NABH-accredited; your treatment is delivered at an NABH-accredited partner centre while CION coordinates the plan, the team and your care.
Does electron beam therapy make me radioactive or unsafe to be around my family?
No. External beam treatment, whether it uses electrons or X-rays, leaves no radioactivity in your body. The beam is generated by a machine, switches off completely when the treatment ends, and nothing is left behind in your tissue. You can hug your children, share a bed, use the same bathroom and travel home on public transport straight after a sitting with no precautions at all. This is different from internal radiation techniques, where a radioactive source is placed inside the body and short-term precautions may apply for a period. If you have been given safety instructions to follow at home, they relate to an internal technique, not to an electron beam course. Ask your treating team to confirm which type of treatment you are having if you are unsure.
This page explains electron beam radiation therapy in general terms. It is not a substitute for guidance from your own oncology team about your diagnosis, the site being treated and your treatment plan.