Radioprotection No 59-1 | Page 33

T-Q Nguyen et al .: Radioprotection 2024 , 59 ( 1 ), 26 – 29 27
Table 1 . The number of input parameters obtained from are district health center and provincial general hospital models .
Hospital types Input parameter
District health center Provincial general hospital
EQUIPMENT DATA Computed tomography scanners
1
2
Fixed Radiographic units
2
6
Mammography units
0
1
Specimen Cabinet units
0
0
Fluoroscopy units
1
Interventional Fluoroscopy units
0
1
Portable radiographic units
1
2
Intra-oral dental x-ray units
1
1
Dual x-ray absorptiometry equipments
1
1
Computed radiography Detectors
2
8
Digital radiography Detectors
2
4
Image display devices ( primary / reporting per pair )
2
0
Magnetic Resonance scanners
0
1
Ultrasound units
2
4
Reading and Printing devices
3
8
Dark rooms � wet processors
0
0
PATIENT DATA Interventional radiology and cardiology procedures
0
400
Patient dose calculations for high dose procedures
0
0
Computed tomography procedures
5000
10000
Planar procedures
27000
50000
Pregnant patients
2
5
ORGANIZATION DATA Diagnostic radiology departments
1
1
Interventional radiology departments ( catheterization labs )
0
1
Number of clinically qualified medical physicists
0
0
Number of medical physicist supportive staff
0
0
Occupationally exposed staff
15
100
Complex staff exposure incidents evaluation
0
1
Risk assessment for staff
0
1
Equipment renewal per year
1
1
Development of new testing protocols
1
1
TRAINING DATA Number of continuing professional development
0
0
units required for clinically qualified medical physicist
Total hours of training delivered to staff annually
40
165
Number of medical physics residents
0
0
N MP ¼ N sum e ¼ X6
X ¼1
N X
! e ; ð1Þ
where N 1 to N 6 are the estimated number of full time equivalent ( FTE ) of a clinically qualified medical physicist required to adequately provide these services for each of the following six factors . These factors are : equipment dependent , patient dependent , radiation protection related , service related , training related and academic teaching and research related . The factor e compensates for the efficiency of scale ( formula 2 ) ( IAEA , 2018 ):
8 < 1if N sum 4 e ¼ 4 þ ðN sum � 4ÞRF
: if N sum > 4 ;
N sum ð2Þ
where RF is the reduction factor that can be applied to the additional medical physicists required and depends on the skill and expertise mix of medical physics staff . This factor could be of the order of 0.6 – 0.8 , leading to a reduction of up to 40 % for any N MP exceeding 4 .
Each N X value is calculated individually according to the formula 3 ( IAEA , 2018 );