Membership Demographics

  • ASTRO counts more than 10,000 radiation oncologists and professionals from other related occupations among its members.

    Other interesting membership facts

    • ASTRO has members on every continent (except Antarctica) and in 80 different countries.
    • ASTRO members are approximately 75 percent male and 25 percent female.
    • Approximately 60 percent of the members have their MD, another 12 percent have a PhD, and 5 percent have both. Another 5 percent have nursing certifications including RN, BSN and/or OCN.
    • The ASTRO Associate Member category includes members from all of the radiation oncology treatment team specialties: medical physicists, radiation biologists, medical dosimetrists, radiation therapists and oncology nurses.
    • ASTRO also counts a number of administrators, physician assistants, lawyers and other professionals among its members.
  • Membership Category Member Count*
    Active 4,419
    Affiliate 209
    Associate 2,160
    Emeritus 930
    Honorary 28
    International 1,433
    International Member-in-Training 284
    Member-in-Training 574
    Total Members 10,037

     *As of September 10, 2015

    Occupation Member Count*
    Administrator 192
    Biologist 88
    Clinical Oncologist 67
    Diagnostic Radiologist 8
    Medical Dosimetrist 131
    Medical Oncologist 29
    Medical Physicist 1,855
    Nuclear Medicine Physician 1
    Nurse 162
    Nurse Practitioner 41
    Other 59
    Physician Assistant 4
    Radiation Oncologist 5,899
    Radiation Therapist/Technologist 124
    Resident/Fellow 856
    Surgical Oncologist 14
    Urologist 0
    Veterinarian 25
    Occupations Not Specified 482
    Total Members 10,037

    *As of September 10, 2015

    State
         Occupation
    Member Count*
    Alaska 13

         Administrator
         Medical Physicist
         Nurse
         Radiation Oncologist

    1
    1
    1
    10

    Alabama 73

         Administrator
         Medical Physicist
         Nurse
         Radiation Oncologist
         Resident/Fellow

    2
    10
    1
    56
    4

    Arkansas 33

         Administrator
         Biologist
         Medical Dosimetrist
         Medical Physicist
         Radiation Oncologist
         Radiation Therapist/Technologist
         Surgical Oncologist

    1
    1
    1
    5
    23
    1
    1

    Arizona 151

         Administrator
         Medical Dosimetrist
         Medical Physicist
         Nurse
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow
         Veterinarian

    4
    2
    39
    2
    92
    2
    8
    2

    California 772

         Administrator
         Biologist
         Clinical Oncologist
         Diagnostic Radiologist
         Medical Dosimetrist
         Medical Oncologist
         Medical Physicist
         Nurse
         Nurse Practitioner
         Other/Unknown
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow
         Surgical Oncologist
         Veterinarian

    20
    12
    2
    2
    10
    4
    175
    20
    1
    14
    422
    9
    78
    1
    2

    Colorado 104

         Administrator
         Medical Dosimetrist
         Medical Physicist
         Nurse
         Nurse Practitioner
         Other/Unknown
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow
         Veterinarian

    5
    2
    21
    2
    2
    1
    62
    1
    6
    2

    Connecticut 94

         Administrator
         Medical Dosimetrist
         Medical Physicist
         Nurse
         Other/Unknown
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow
         Veterinarian

    2
    3
    24
    1
    1
    52
    2
    8
    1

    District of Columbia 23

         Medical Physicist
         Radiation Oncologist
         Resident/Fellow

    3
    14
    6

    Delaware 19

         Administrator
         Medical Physicist
         Nurse
         Radiation Oncologist

    4
    3
    1
    11

    Florida 463

         Administrator
         Medical Dosimetrist
         Medical Physicist
         Nurse
         Nurse Practitioner
         Other/Unknown
         Physician Assistant
         Radiation Oncologist
         Radiation Therpaist/Technologist
         Resident/Fellow
         Veterinarian

    11
    12
    112
    9
    3
    5
    1
    276
    4
    29
    1

    Georgia 161

         Administrator
         Medical Dosimetrist
         Medical Physicist
         Nurse
         Nurse Practitioner
         Other
         Radiation Oncologist
         Resident/Fellow
         Surgical Oncologist

    2
    1
    28
    3
    4
    4
    102
    16
    1

    Guam 2

         Medical Physicist
         Radiation Oncologist

    1
    1

    Hawaii 23

         Administrator
         Medical Dosimetrist
         Medical Physicist
         Nurse
         Other/Unknown
         Radiation Oncologist
         Radiation Therapist/Technologist     

    1
    1
    2
    1
    1
    16
    1

    Iowa 54

         Administrator
         Medical Dosimetrist
         Medical Physicist
         Nurse
         Nurse Practitioner
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow

    1
    2
    13
    1
    1
    31
    1
    4

    Idaho 19

         Administrator
         Medical Dosimetrist
         Medical Physicist
         Radiation Oncologist
         Radiation Therapist/Technologist

    1
    2
    1
    13
    2

    Illinois 253

         Administrator
         Biologist
         Clinical Oncologist
         Medical Physicist
         Nurse
         Nurse Practitioner
         Other/Unknown
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow
         Surgical Oncologist

    9
    3
    1
    48
    7
    3
    3
    158
    1
    19
    1

    Indiana 116

         Administrator
         Biologist
         Medical Dosimetrist
         Medical Physicist
         Nurse
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow
         Veterinarian

    4
    1
    1
    25
    4
    74
    3
    3
    1

    Kansas 41

         Administrator
         Biologist
         Medical Dosimetrist
         Medical Physicist
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow

    3
    1
    1
    7
    26
    1
    2

    Kentucky 75

         Medical Physicist
         Nurse
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow

    16
    5
    44
    2
    8

    Louisiana 59

         Medical Dosimetrist
         Medical Physicist
         Nurse
         Nurse Practitioner
         Other/Unknown
         Radiation Oncologist
         Radiation Therapist/Technologist

    1
    16
    1
    1
    1
    38
    1

    Massachusetts 268

         Administrator
         Biologist
          Medical Dosimetrist
         Medical Oncologist
         Medical Physicist
         Nurse
         Nurse Practitioner
         Other/Unknown
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow
         Veterinarian

    8
    4
    5
    1
    54
    8
    4
    2
    154
    3
    23
    2

    Maryland 189

         Administrator
         Biologist
         Diagnostic Radiologist
         Medical Dosimetrist
         Medical Oncologist
         Medical Physicist
         Nurse
         Nurse Practitioner
         Other/Unknown
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow

    3
    9
    1
    3
    2
    40
    3
    1
    2
    98
    3
    24

    Maine 23

         Administrator
         Medical Physicist
         Nurse Practitioner
         Other/Unknown
         Radiation Oncologist

    2
    3
    1
    2
    15

    Michigan 249

         Administrator
         Biologist
         Diagnostic Radiologist
         Medical Dosimetrist
         Medical Physicist
         Nurse
         Nurse Practitioner
         Other/Unknown
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow

    8
    3
    1
    3
    69
    9
    1
    1
    120
    2
    32

    Minnesota 121

         Administrator
         Medical Dosimetrist
         Medical Physicist
         Nurse
         Radiation Oncologist
         Resident/Fellow

    1
    1
    34
    2
    73
    10

    Missouri 153

         Administrator
         Biologist
         Medical Dosimetrist
         Medical Physicist
         Nurse
         Nurse Practitioner
         Other/Unknown
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow

    6
    2
    2
    37
    2
    1
    1
    89
    1
    12

    Mississippi 35

         Administrator
         Medical Oncologist
         Medical Physicist
         Nurse Practitioner
         Radiation Oncologist
         Resident/Fellow

    1
    1
    7
    1
    24
    1

    Montana 20

         Medical Dosimetrist
         Medical Physicist
         Nurse
         Radiation Oncologist

    1
    2
    2
    15

    North Carolina 238

         Administrator
         Biologist
         Diagnostic Radiologist
         Medical Dosimetrist
         Medical Physicist
         Nurse Practitioner
         Other/Unknown
         Physician Assistant
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow
         Veterinarian

    5
    1
    1
    1
    54
    3
    1
    1
    140
    4
    24
    3

    North Dakota 17

         Medical Physicist
         Radiation Oncologist

    8
    9

    Nebraska 38

         Administrator
         Medical Physicist
         Nurse
         Radiation Oncologist
         Resident/Fellow

    2
    10
    1
    23
    2

    New Hampshire 25

         Medical Physicist
         Nurse Practitioner
         Radiation Oncologist

    7
    1
    17

    New Jersey 198

         Administrator
         Biologist
         Medical Dosimetrist
         Medical Oncologist
         Medical Physicist
         Nurse
         Nurse Practitioner
         Other/Unknown
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow

    9
    2
    1
    1
    54
    9
    1
    1
    108
    4
    8

    New Mexico 28

         Administrator
         Medical Physicist
         Nurse
         Other/Unknown
         Radiation Oncologist

    1
    5
    1
    1
    20

    Nevada     44

         Administrator
         Medical Dosimetrist
         Medical Physicist
         Radiation Oncologist
         Radiation Therapist/Technologist

    1
    1
    7
    34
    1

    New York 488

         Administrator
         Biologist
         Clinical Oncologist
         Medical Dosimetrist
         Medical Oncologist
         Medical Physicist
         Nurse
         Nurse Practitioner
         Other/Unknown
         Physician Assistant
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow
         Surgical Oncologist
         Veterinarian

    11
    6
    1
    12
    1
    106
    6
    2
    3
    1
    249
    12
    74
    2
    2

    Ohio 256

         Administrator
         Biologist
         Medical Dosimetrist
         Medical Physicist
         Nurse
         Nurse Practitioner
         Other
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow
         Veterinarian

    8
    4
    3
    48
    7
    3
    3
    146
    1
    32
    1

    Oklahoma 66

         Administrator
         Medical Dosimetrist
         Medical Physicist
         Other/Unknown
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow

    1
    3
    15
    1
    41
    1
    4

    Oregon 79

         Medical Dosimetrist
         Medical Oncologist
         Medical Physicist
         Nurse
         Nurse Practitioner
         Radiation Oncologist
         Resident/Fellow

    1
    1
    14
    3
    1
    54
    5

    Pennsylvania 406

         Administrator
         Biologist
         Medical Dosimetrist
         Medical Oncologist
         Medical Physicist
         Nurse
         Nurse Practitioner
         Other/Unknown
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow
          Veterinarian

    10
    3
    10
    2
    104
    13
    4
    4
    210
    7
    38
    1

    Puerto Rico 20

         Medical Physicist
         Radiation Oncologist

    6
    14

    Rhode Island 21

         Medical Dosimetrist
         Medical Physicist
         Nurse
         Radiation Oncologist

    1
    6
    1
    13

    South Carolina 73

         Administrator
         Medical Dosimetrist
         Medical Oncologist
         Medical Physicist
         Nurse
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow

    1
    2
    1
    17
    1
    47
    1
    3

    South Dakota 19

         Medical Dosimetrist
         Medical Physicist
         Other/Unknown
         Radiation Oncologist
         Radiation Therapist/Technologist

    2
    3
    1
    11
    2

    Tennessee 119

         Administrator
         Biologist
         Medical Dosimetrist
         Medical Physicist
         Nurse
         Other
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow

    6
    2
    2
    25
    2
    3
    71
    1
    7

    Texas 515

         Administrator
         Biologist
         Clinical Oncologist
         Medical Dosimetrist
         Medical Oncologist
         Medical Physicist
         Nurse
         Nurse Practitioner
         Other/Unknown
         Physician Assistant
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow
         Surgical Oncologist
         Veterinarian

    10
    2
    1
    16
    1
    136
    10
    1
    6
    1
    269
    9
    48
    3
    2

    Utah 42

         Administrator
         Medical Dosimetrist
         Medical Physicist
         Other/Unknown
         Radiation Oncologist
         Resident/Fellow

    1
    1
    7
    1
    28
    4

    Virginia 146

         Administrator
         Biologist
         Clinical Oncologist
         Medical Dosimetrist
         Medical Physicist
         Nurse
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow

    4
    1
    1
    1
    32
    3
    89
    7
    8

    Virgin Islands 1
         Radiation Oncologist

    1

    Vermont 15

         Administrator
         Medical Dosimetrist
         Medical Physicist
         Nurse
         Radiation Oncologist

    1
    1
    4
    1
    8

    Washington 179

         Administrator
         Biologist
         Diagnostic Radiologist
         Medical Dosimetrist
         Medical Physicist
         Nurse
         Other/Unknown
         Radiation Oncologist
         Resident/Fellow

    6
    1
    1
    3
    47
    4
    1
    105
    11

    Wisconsin 145

         Administrator
         Biologist
         Medical Dosimetrist
         Medical Physicist
         Nurse
         Other/Unknown
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow

    5
    3
    6
    35
    2
    3
    77
    1
    13

    West Virginia 26

         Administrator
         Medical Physicist
         Radiation Oncologist
         Radiation Therapist/Technologist

    1
    6
    18
    1

    Wyoming 8

         Medical Physicist
         Nurse
         Radiation Oncologist

    2
    2
    4


    *As of September 10, 2015

    Country
        Occupation
    Member Count
    United States 7,189

         Administrator
         Biologist
         Clinical Oncologist
         Diagnostic Radiologist
         Medical Dosimetrist
         Medical Oncologist
         Medical Physicist
         Nurse
         Nurse Practitioner
         Other
         Physician Assistant
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow
         Surgical Oncologist
         Veterinarian

    182
    74
    7
    6
    119
    15
    1,621
    154
    41
    69
    4
    4,212
    88
    567
    9
    21

    Albania 1

         Radiation Oncologist

    1

    Antigua and Barbuda 1

         Clinical Oncologist

    1
    Argentina 27

         Administrator
         Medical Physicist
         Radiation Oncologist
         Resident/Fellow

    2
    3
    21
    1

    Australia 139

         Clinical Oncologist
         Medical Dosimetrist
         Medical Oncologist
         Medical Physicist
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow
         Veterinarian

    1
    2
    1
    7
    99
    10
    18
    1

    Austria 20

         Medical Physicist
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow
         Veterinarian

    2
    14
    1
    2
    1

    Bahamas 1

         Radiation Oncologist

    1

    Barbados 1

         Radiation Oncologist

    1

    Belgium 37

         Medical Physicist
         Radiation Oncologist
         Resident/Fellow

    2
    34
    1

    Brazil 101

         Administrator
         Medical Physicist
         Other
         Radiation Oncologist
         Resident/Fellow

    1
    5
    1
    83
    11

    Bulgaria 3

         Radiation Oncologist
         Resident/Fellow

    1
    2

    Canada 388

         Administrator
         Biologist
         Clinical Oncologist
         Medical Dosimetrist
         Medical Physicist
         Other
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow
         Veterinarian

    2
    5
    1
    2
    76
    6
    229
    8
    58
    1

    Chile 13

         Radiation Oncologist
         Resident/Fellow

    10
    3

    China 32

         Clinical Oncologist
         Medical Physicist
         Nurse
         Radiation Oncologist

    1
    3
    2
    26

    Colombia 10

         Radiation Oncologist
         Resident/Fellow

    9
    1

    Costa Rica 3

         Radiation Oncologist

    3

    Croatia 3

         Radiation Oncologist

    3

    Cyprus 3

         Medical Physicist
         Radiation Oncologist

    2
    1

    Czech Republic 6

         Radiation Oncologist
         Surgical Oncologist

    5
    1

    Denmark 15

         Administrator
         Clinical Oncologist
         Medical Physicist
         Radiation Oncologist
         Resident/Fellow

    1
    1
    6
    6
    1

    Dominican Republic 3

         Radiation Oncologist

    3

    Ecuador 2

         Medical Physicist
         Radiation Oncologist

    1
    1

    Egypt 6

         Clinical Oncologist
         Radiation Oncologist
         Resident/Fellow

    3
    2
    1

    Finland 6

         Clinical Oncologist
         Medical Physicist
         Radiation Oncologist

    1
    1
    4

    France 40

         Medical Oncologist
         Radiation Oncologist
         Resident/Fellow

    1
    34
    5

    Germany 156

         Medical Oncologist
         Medical Physicist
         Other
         Radiation Oncologist
         Resident/Fellow

    1
    13
    1
    132
    9

    Ghana 4

         Radiation Oncologist
         Resident/Fellow

    2
    2

    Greece 11

         Radiation Oncologist

    11

    Guatemala 3

         Radiation Oncologist

    3

    Hong Kong 26

         Clinical Oncologist
         Medical Dosimetrist
         Medical Physicist
         Nurse
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow

    6
    4
    6
    1
    3
    1
    5

    India 81

         Clinical Oncologist
         Medical Physicist
         Other
         Radiation Oncologist
         Resident/Fellow

    1
    4
    1
    58
    17

    Indonesia 1

         Radiation Oncologist

    1

    Iran, Islamic Republic Of 2

         Radiation Oncologist
         Resident/Fellow

    1
    1

    Iraq 1

         Resident/Fellow

    1

    Ireland 17

         Medical Physicist
         Radiation Oncologist
         Resident/Fellow

    1
    13
    3

    Israel 24

         Biologist
         Medical Physicist
         Radiation Oncologist
         Resident/Fellow

    1
    3
    17
    3

    Italy 40

         Medical Oncologist
         Medical Physicist
         Radiation Oncologist
         Resident/Fellow

    1
    3
    35
    1

    Jamaica 3

         Clinical Oncologist
         Medical Physicist
         Radiation Oncologist

    1
    1
    1

    Japan 348

         Biologist
         Clinical Oncologist
         Diagnostic Radiologist 
         Medical Oncologist
         Medical Physicist
         Nuclear Medicine Physician
         Other
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow
         Surgical Oncologist

    2
    10
    1
    4
    8
    1
    1
    280
    3
    35
    3

    Jordan 2

         Resident/Fellow

    2

    Korea, Republic Of 46

         Biologist
         Medical Physicist
         Radiation Oncologist
         Resident/Fellow

    1
    5
    32
    8

    Kuwait 2

         Medical Physicist
         Radiation Oncologist

    1
    1

    Latvia 1

         Radiation Oncologist

    1

    Lebanon 11

         Medical Physicist
         Radiation Oncologist
         Resident/Fellow

    1
    8
    2

    Lithuania 1

         Radiation Oncologist

    1

    Luxembourg 1

         Resident/Fellow

    1

    Malaysia 4

         Clinical Oncologist
         Medical Physicist
         Radiation Oncologist

    1
    1
    2

    Martinique 1

         Radiation Oncologist

    1

    Mauritania 1

         Resident/Fellow

    1

    Mexico 56

         Medical Oncologist
         Medical Physicist
         Radiation Oncologist
         Resident/Fellow

    2
    4
    42
    8

    Morocco 1

         Resident/Fellow

    1

    Netherlands 109

         Medical Physicist
         Radiation Oncologist
         Resident/Fellow

    19
    85
    5

    Netherlands Antilles 1

         Radiation Oncologist

    1

    New Zealand 30

         Medical Dosimetrist
         Medical Physicist
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow

    1
    3
    17
    3
    6

    Nigeria 5

         Radiation Oncologist
         Resident/Fellow

    2
    3

    Norway 4

         Clinical Oncologist
         Medical Physicist
         Radiation Oncologist

    1
    2
    1

    Pakistan 3

         Radiation Oncologist
         Resident/Fellow

    1
    2

    Panama 3

         Radiation Oncologist

    3

    Peru 7

         Radiation Oncologist
         Resident/Fellow

    4
    3

    Philippines 14

         Medical Physicist
         Radiation Oncologist
         Resident/Fellow

    1
    12
    1

    Poland 19

         Medical Physicist
         Radiation Oncologist
         Resident/Fellow

    4
    13
    2

    Portugal 3

         Radiation Oncologist
         Resident/Fellow

    2
    1

    Qatar 3

         Medical Physicist
         Radiation Oncologist

    2
    1

    Romania 3

         Radiation Oncologist
         Resident/Fellow

    2
    1

    Russia 3

         Medical Oncologist
         Radiation Oncologist
         Resident/Fellow

    1
    1
    1

    Saudi Arabia 10

         Clinical Oncologist
         Medical Physicist
         Radiation Oncologist

    1
    3
    6

    Serbia 1

         Resident/Fellow

    1

    Singapore 16

         Medical Dosimetrist
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow

    1
    8
    2
    5

    Slovakia 3

         Radiation Oncologist
         Surgical Oncologist

    2
    1

    South Africa 10

         Clinical Oncologist
         Radiation Oncologist
         Resident/Fellow

    3
    5
    2

    Spain 31

         Medical Oncologist
         Medical Physicist
         Radiation Oncologist
         Resident/Fellow

    1
    2
    18
    10

    Sweden 12

         Medical Physicist
         Other
         Radiation Oncologist

    3
    1
    8

    Switzerland 39

         Medical Physicist
         Other
         Radiation Oncologist
         Resident/Fellow

    5
    3
    32
    2

    Taiwan 53

         Administrator
         Biologist
         Medical Physicist
         Radiation Oncologist
         Resident/Fellow

    1
    1
    2
    41
    8

    Thailand 9

         Medical Physicist
         Radiation Oncologist
         Resident/Fellow

    1
    7
    1

    Turkey 30

         Administrator
         Medical Physicist
         Radiation Oncologist

    1
    2
    27

    United Arab Emirates 3

         Radiation Oncologist

    3

    United Kingdom 85

         Clinical Oncologist
         Medical Physicist
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow
         Veterinarian

    25
    5
    31
    4
    19
    1

    Uruguay 2

         Radiation Oncologist
         Resident/Fellow

    1
    1

    Venezuala 10

         Medical Oncologist
         Medical Physicist
         Radiation Oncologist
         Resident Fellow

    1
    2
    6
    1

    Country Not Provided 461

         Administrator
         Biologist
         Clinical Oncologist
         Diagnostic Radiologist
         Medical Dosimetrist
         Medical Oncologist
         Medical Physicist
         Nurse
         Other
         Radiation Oncologist
         Radiation Therapist/Technologist
         Resident/Fellow

    2
    4
    2
    1
    2
    1
    19
    5
    300
    111
    4
    10

    Total Members 10,037

    *As of September 10, 2015