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 by Category

Membership by Occupation

US Member Occupation by State

State Occupation	Member Count*
Alaska	13
Administrator Nurse Radiation Oncologist	1 1 11
Alabama	84
Administrator Medical Physicist Radiation Oncologist Resident/Fellow	1 12 62 9
Arkansas	40
Administrator Biologist Medical Physicist Radiation Oncologist Resident/Fellow Surgical Oncologist	1 2 5 30 1 1
Arizona	160
Administrator Medical Dosimetrist Medical Physicist Nurse Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow Surgical Oncologist Veterinarian	5 1 39 1 102 2 8 1 1
California	855
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	16 12 1 1 6 4 191 18 1 16 490 8 88 1 2
Colorado	123
Administrator Medical Dosimetrist Medical Physicist Nurse Nurse Practitioner Other/Unknown Physician Assistant Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow Veterinarian	3 2 22 2 2 1 1 76 2 9 3
Connecticut	97
Administrator Medical Dosimetrist Medical Physicist Nurse Other/Unknown Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow	3 2 24 1 1 53 1 12
District of Columbia	27
Medical Physicist Radiation Oncologist Resident/Fellow	5 15 7
Delaware	27
Administrator Medical Physicist Nurse Radiation Oncologist Resident/Fellow	6 7 1 12 1
Florida	528
Administrator Biologist Clinical Oncologist Medical Dosimetrist Medical Physicist Nurse Nurse Practitioner Other Physician Assistant Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow Veterinarian	12 2 1 11 116 5 4 8 1 333 3 31 1
Georgia	182
Administrator Biologist Medical Physicist Nurse Nurse Practitioner Other/Unknown Physician Assistant Radiation Oncologist Resident/Fellow Surgical Oncologist	3 1 28 3 3 4 2 120 17 1
Guam	2
Radiation Oncologist	2
Hawaii	25
Administrator Medical Dosimetrist Medical Physicist Nurse Other/Unknown Radiation Oncologist	1 1 3 1 1 18
Iowa	67
Biologist Medical Dosimetrist Medical Physicist Nurse Practitioner Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow	1 3 13 1 38 2 9
Idaho	19
Medical Dosimetrist Radiation Oncologist Radiation Therapist/Technologist	2 16 1
Illinois	276
Administrator Biologist Clinical Oncologist Medical Physicist Nurse Nurse Practitioner Other/Unknown Radiation Oncologist Resident/Fellow Surgical Oncologist	11 2 2 49 6 3 2 176 23 1
Indiana	130
Administrator Biologist Medical Physicist Nurse Other/Unknown Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow Veterinarian	4 1 26 3 1 86 2 6 1
Kansas	47
Administrator Biologist Medical Dosimetrist Medical Physicist Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow	3 2 1 8 27 1 5
Kentucky	75
Biologist Medicala Physicist Nurse Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow	1 15 5 45 1 8
Louisiana	68
Medical Physicist Nurse Practitioner Radiation Oncologist	18 1 49
Massachusetts	300
Administrator Biologist Medical Dosimetrist Medical Oncologist Medical Physicist Nurse Nurse Practitioner Other/Unknown Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow Veterinarian	9 2 4 2 57 7 3 1 165 7 40 3
Maryland	199
Administrator Biologist Medical Dosimetrist Medical Oncologist Medical Physicist Nurse Nurse Practitioner Other/Unknown Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow	6 12 3 1 31 3 1 3 110 3 26
Maine	21
Administrator Medical Physicist Other/Unknown Radiation Oncologist	1 4 1 15
Michigan	272
Administrator Biologist Clinical Oncologist Diagnostic Radiologist Medical Dosimetrist Medical Physicist Nurse Other/Unknown Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow	6 3 1 1 1 72 7 4 138 4 35
Minnesota	146
Administrator Biologist Medical Dosimetrist Medical Physicist Nurse Other/Unknown Physician Assistant Radiation Oncologist Resident/Fellow Veterinarian	3 1 3 43 1 1 1 77 15 1
Missouri	163
Administrator Biologist Medical Dosimetrist Medical Physicist Nurse Practitioner Other/Unknown Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow	4 1 2 37 2 1 100 1 15
Mississippi	41
Administrator Medical Oncologist Medical Physicist Nurse Practitioner Radiation Oncologist Resident/Fellow	1 1 10 1 27 1
Montana	21
Medical Physicist Nurse Radiation Oncologist	1 1 19
North Carolina	255
Administrator Biologist Diagnostic Radiologist Medical Dosimetrist Medical Physicist Nurse Practitioner Other/Unknown Physician Assistant Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow Veterinarian	3 2 1 1 57 3 4 1 151 1 28 3
North Dakota	19
Medical Physicist Radiation Oncologist	7 12
Nebraska	36
Administrator Biologist Medical Physicist Radiation Oncologist Resident/Fellow	1 1 9 22 3
New Hampshire	28
Medical Physicist Radiation Oncologist	7 21
New Jersey	204
Administrator Biologist Medical Dosimetrist Medical Oncologist Medical Physicist Nurse Nurse Practitioner Other/Unknown Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow	6 2 1 1 59 5 1 2 117 3 7
New Mexico	38
Administrator Medical Physicist Nurse Other/Unknown Radiation Oncologist	3 8 1 1 25
Nevada	49
Administrator Medical Dosimetrist Medical Physicist Radiation Oncologist	1 1 9 38
New York	545
Administrator Biologist Medical Dosimetrist Medical Physicist Nurse Nurse Practitioner Other/Unkown Physician Assistant Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow Surgical Oncologist Veterinarian	15 6 10 109 4 4 4 1 291 11 83 2 5
Ohio	283
Administrator Biologist Medical Dosimetrist Medical Physicist Nurse Nurse Practitioner Other/Unknown Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow Veterinarian	6 6 2 52 5 4 5 167 4 31 1
Oklahoma	54
Administrator Medical Dosimetrist Medical Physicist Nurse Other/Unknown Radiation Oncologist Resident/Fellow	1 2 9 1 1 38 2
Oregon	89
Administrator Biologist Medical Dosimetrist Medical Oncologist Medical Physicist Nurse Nurse Practitioner Radiation Oncologist Resident/Fellow	1 2 1 1 13 1 1 65 4
Pennsylvania	413
Administrator Biologist Clinical Oncologist Medical Dosimetrist Medical Oncologist Medical Physicist Nurse Nurse Practitioner Other/Unknown Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow Veterinarian	8 3 1 8 1 98 9 1 6 233 5 39 1
Puerto Rico	18
Medical Physicist Radiation Oncologist	3 15
Rhode Island	31
Administrator Clinical Oncologist Medical Dosimetrist Medical Physicist Nurse Radiation Oncologist	1 1 1 11 1 16
South Carolina	85
Administrator Medical Dosimetrist Medical Oncologist Medical Physicist Radiation Oncologist Resident/Fellow	1 1 1 20 58 4
South Dakota	21
Medical Dosimetrist Medical Physicist Nurse Practitioner Other/Unknown Radiation Oncologist Radiation Therapist/Technologist Urologist	2 3 1 2 11 1 1
Tennessee	133
Administrator Biologist Medical Dosimetrist Medical Physicist Nurse Other/Unknown Physician Assistant Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow	8 3 2 22 1 3 2 81 3 8
Texas	553
Administrator Biologist Medical Dosimetrist Medical Physicist Nurse Nurse Practitioner Other/Unknown Physician Assistant Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow Surgical Oncologist Veterinarian	13 3 14 138 13 3 3 1 293 8 58 3 3
Utah	53
Administrator Medical Dosimetrist Medical Physicist Nurse Other/Unknown Physician Assistant Radiation Oncologist Resident/Fellow	1 1 9 2 1 2 31 6
Virginia	169
Administrator Biologist Medical Dosimetrist Medical Physicist Nurse Other/Unknown Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow Surgical Oncologist	7 1 1 37 3 5 97 3 14 1
Virgin Islands	1
Radiation Oncologist	1
Vermont	15
Administrator Medical Dosimetrist Medical Physicist Radiation Oncologist Radiation Therapist/Technologist	1 1 4 8 1
Washington	198
Administrator Biologist Diagnostic Radiologist Medical Dosimetrist Medical Physicist Nurse Other/Unknown Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow Veterinarian	5 1 1 2 49 4 4 123 1 7 1
Wisconsin	167
Administrator Biologist Clinical Oncologist Medical Dosimetrist Medical Physicist Nurse Nurse Practitioner Other/Unknown Radiation Oncologist Radiation Therapist/Technologists Resident/Fellow	6 2 1 5 31 2 1 7 93 4 15
West Virginia	31
Administrator Medical Physicist Radiation Oncologist Radiation Therapist/Technologist	1 6 23 1
Wyoming	9
Medical Physicist Nurse Radiation Oncologist	2 1 6

*As of April 4, 2017

Member Occupations by Country

Country Occupation	Member Count
United States	7,538
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 Urologist Veterinarian	189 76 7 4 98 12 1,613 120 41 93 12 4,475 84 676 11 1 26
Albania	1
Radiation Oncologist	1
Antigua and Barbuda	2
Clinical Oncologist Radiation Oncologist	1 1
Argentina	27
Administrator Medical Physicist Radiation Oncologist Resident/Fellow	1 3 22 1
Australia	138
Administrator Clinical Oncologist Medical Dosimetrist Medical Physicist Other/Unknown Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow Veterinarian	1 1 1 6 1 104 10 13 1
Austria	22
Medical Physicist Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow Veterinarian	2 17 1 1 1
Bahamas	2
Clinical Oncologist Radiation Oncologist	1 1
Barbados	1
Radiation Oncologist	1
Belgium	48
Medical Physicist Nurse Other/Unknown Radiation Oncologist Resident/Fellow	4 1 2 37 4
Bolivia	1
Radiation Oncologist	1
Botswana	1
Clinical Oncologist	1
Brazil	126
Medical Physicist Radiation Oncologist Resident/Fellow	6 90 30
Bulgaria	4
Radiation Oncologist Resident/Fellow	2 2
Canada	405
Administrator Biologist Clinical Oncologist Medical Dosimetrist Medical Physicist Nurse Practitioner Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow	3 6 1 2 60 1 245 6 81
Chile	16
Other/Unknown Radiation Oncologist Resident/Fellow	1 13 2
China	47
Clinical Oncologist Medical Oncologist Medical Physicist Nurse Radiation Oncologist Resident/Fellow	3 1 4 2 35 2
Colombia	11
Clinical Oncologist Radiation Oncologist Resident/Fellow	1 7 3
Costa Rica	3
Radiation Oncologist	3
Croatia	2
Radiation Oncologist	3
Cyprus	4
Medical Physicist Radiation Oncologist	2 2
Czech Republic	5
Radiation Oncologist	5
Denmark	13
Administrator Clinical Oncologist Medical Physicist Radiation Oncologist Resident/Fellow	1 1 5 5 1
Dominican Republic	4
Radiation Oncologist	4
Ecuador	2
Medical Physicist Radiation Oncologist	1 1
Egypt	9
Clinical Oncologist Radiation Oncologist Resident/Fellow	4 3 2
Estonia	1
Radiation Oncologist	1
Finland	6
Clinical Oncologist Medical Physicist Radiation Oncologist	1 1 4
France	39
Medical Oncologist Radiation Oncologist Resident/Fellow Veterinarian	1 31 6 1
Georgia	1
Resident/Fellow	1
Germany	153
Medical Oncologist Medical Physicist Nuclear Medicine Physician Other/Unknown Radiation Oncologist Resident/Fellow	1 12 1 1 1 129 9
Ghana	4
Clinical Oncologist Radiation Oncologist Resident/Fellow	1 2 1
Greece	8
Radiation Oncologist	8
Guatemala	3
Radiation Oncologist	3
Hong Kong	20
Clinical Oncologist Medical Dosimetrist Medical Physicist Nurse Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow	6 2 4 1 2 1 4
India	85
Clinical Oncologist Medical Physicist Radiation Oncologist Resident/Fellow	2 4 61 18
Iran, Islamic Republic Of	3
Clinical Oncologist Radiation Oncologist Resident/Fellow	1 1 1
Iraq	2
Radiation Oncologist Resident/Fellow	1 1
Ireland	18
Medical Physicist Radiation Oncologist Resident/Fellow	3 13 2
Israel	27
Biologist Medical Physicist Radiation Oncologist Resident/Fellow	1 2 18 6
Italy	46
Medical Oncologist Medical Physicist Other/Unknown Radiation Oncologist Resident/Fellow	1 3 3 38 1
Jamaica	3
Clinical Oncologist Medical Physicist Radiation Oncologist	1 1 1
Japan	354
Biologist Clinical Oncologist Diagnostic Radiologist Medical Oncologist Medical Physicist Nuclear Medicine Physician Other Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow Surgical Oncologist Urologist	2 10 2 3 10 1 1 276 4 40 3 2
Jordan	2
Resident/Fellow	2
Korea, Republic Of	53
Biologist Clinical Oncologist Medical Physicist Radiation Oncologist Resident/Fellow	1 2 7 28 15
Lebanon	14
Medical Physicist Other/Unknown Radiation Oncologist Resident/Fellow	1 1 10 2
Lithuania	1
Radiation Oncologist	1
Malaysia	4
Clinical Oncologist Medical Physicist Radiation Oncologist Resident/Fellow	1 1 1 1
Malta	2
Resident/Fellow	2
Martinique	3
Radiation Oncologist	3
Mexico	54
Medical Oncologist Medical Physicist Radiation Oncologist Resident/Fellow	2 2 43 7
Morocco	1
Resident/Fellow	1
Myanmar	3
Radiation Oncologist	3
Netherlands	103
Medical Physicist Radiation Oncologist Resident/Fellow	18 82 3
Netherlands Antilles	1
Radiation Oncologist	1
New Zealand	24
Medical Dosimetrist Medical Physicist Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow	1 2 14 2 4
Nigeria	3
Radiation Oncologist Resident/Fellow	1 2
Norway	4
Clinical Oncologist Medical Physicist Radiation Oncologist	1 2 1
Pakistan	4
Radiation Oncologist Resident/Fellow	3 1
Panama	3
Radiation Oncologist	3
Peru	10
Radiation Oncologist Resident/Fellow	5 5
Philippines	22
Medical Physicist Radiation Oncologist Resident/Fellow	3 16 2
Poland	18
Medical Physicist Radiation Oncologist Resident/Fellow	2 13 3
Portugal	6
Radiation Oncologist Resident/Fellow	4 2
Puerto Rico	1
Medical Physicist	1
Qatar	4
Medical Physicist Radiation Oncologist	2 2
Romania	5
Radiation Oncologist Resident/Fellow	2 3
Russia	2
Medical Oncologist Radiation Oncologist	1 1
Saudi Arabia	15
Clinical Oncologist Medical Physicist Radiation Oncologist	1 3 11
Serbia	2
Radiation Oncologist Resident/Fellow	1
Singapore	17
Clinical Oncologist Medical Dosimetrist Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow	1 1 9 3 3
Slovakia	3
Radiation Oncologist Surgical Oncologist	2 1
South Africa	8
Clinical Oncologist Radiation Oncologist Resident/Fellow	3 4 1
Spain	31
Medical Oncologist Medical Physicist Radiation Oncologist Resident/Fellow	1 2 19 9
Sweden	11
Medical Physicist Other/Unknown Radiation Oncologist	2 1 8
Switzerland	39
Medical Physicist Radiation Oncologist Resident/Fellow	3 33 3
Taiwan	59
Administrator Biologist Medical Physicist Radiation Oncologist Resident/Fellow	1 1 2 42 13
Tanzania, United Republic Of	1
Resident/Fellow	1
Thailand	11
Radiation Oncologist Resident/Fellow	8 3
Turkey	30
Administrator Medical Physicist Radiation Oncologist	1 4 25
United Arab Emirates	2
Radiation Oncologist	2
United Kingdom	89
Clinical Oncologist Medical Physicist Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow	22 5 35 3 24
Uruguay	1
Radiation Oncologist	1
Venezuala	6
Medical Oncologist Medical Physicist Radiation Oncologist	1 1 4 1
Vietnam	1
Radiation Oncologist	1
Country Not Provided	145
Administrator Biologist Clinical Oncologist Diagnostic Radiologist Medical Dosimetrist Medical Oncologist Medical Physicist Nurse Radiation Oncologist Radiation Therapist/Technologist Resident/Fellow	1 4 2 1 1 1 15 3 104 1 12
*Total Members*	*10,209*

*As of April 4, 2017

Membership Category	Member Count*
Active	4,363
Affiliate	184
Associate	1,630
Emeritus	1,007
Honorary	31
International	1,370
International Member-in-Training	501
Member-in-Training	793
Postdoctoral Fellow	21
Student/Grad Student	162
*Total Members*	*10,062*

Occupation	Member Count*
Administrator	234
Biologist	98
Clinical Oncologist	88
Diagnostic Radiologist	7
Medical Dosimetrist	84
Medical Oncologist	32
Medical Physicist	1,576
Nuclear Medicine Physician	2
Nurse	55
Nurse Practitioner	31
Other	69
Physician Assistant	10
Postdoctoral Fellow	20
Radiation Oncologist	6,051
Radiation Therapist/Technologist	64
Resident/Fellow	1,149
Student/Grad Student	153
Surgical Oncologist	13
Urologist	3
Veterinarian	19
Occupations Not Specified	304
Total Members	*10,062*