Monte Carlo simulation of biological shielding parameters in PGNAA

Micro & nano letters

article

Jianbo Yang¹  Kexin Peng¹  Yujie Qiao¹  Can Zhang¹  Rui Li¹  Zhe Li² 

[1] Chengdu University of Technology;Institute of High Energy Physics, Chinese Academy of Sciences

关键词: Monte Carlo methods;    radiation protection;    neutron activation analysis;    spontaneous fission;    lead;    boron compounds;    lithium compounds;    neutron absorption;    multilayers;    composite material interfaces;    biological effects of gamma-rays;    Monte Carlo simulation;    biological shielding parameters;    PGNAA;    prompt γ neutron activation analysis;    252Cf spontaneous fission neutron;    optimised radiation protection design parameters;    MCNP Monte Carlo code;    lead shield thickness;    sample chamber;    neutron-absorbing materials;    biological multilayer composite shield;    thick Pb innermost layer;    moderation layer;    thick paraffin;    thick borax;    PGNAA facility;    size 2 mm to 25 cm;    Pb;    B4C;    B2O3;    LiOH;    LiF;   

DOI  :  10.1049/mnl.2017.0644

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Right-siting chronic asthma care from acute care hospitals to primary care providers (PCPs) was an initiative undertaken at an institution in Singapore. This study aimed to evaluate the effectiveness of right-siting asthma patients from three different clinical settings. 　 A r etrospective study was conducted from January 2012 to December 2012. A total of 460 patients were right-sited to primary care providers (PCP). Of these, 392 (85.2%) were decanted to polyclinics and 68 (14.8%) to general practice (GP) settings. The asthma control test scores were significantly improved for patients who were followed up at the polyclinic within 12 months after being right-sited to the PCP (p<0 .00 1 ). O ut-patients had lower emergency department (ED) re-attendance rates compared to other referral sources (p<0.001) and in-patients had higher re-admission rates than other referral sources (p=0.002). Re-admission patients had a statistically significantly higher mean age of 55 than non-re-admission patients at 44 (p < .001). Patients with prior ED attendance and hospitalization had higher rates of re-attendance and re-admission within a year (p = 0.00 1, p<0.001). The risk of ED patients experiencing re-attendance at the ED within 12 months was 5 times that of out-patients (p<0.001) . In conclusion, the employment of a right-siting coordinator (RSO) did provide better transition for patient care between acute hospital settings and PCPs. Although the single intervention of connecting patients to their PCPs with an appointment prior to discharge did not significantly improve patient compliance to follow-up care, it did appear to improve asthma control in patients who kept to their PCP appointments suggesting that PCP follow-up is effective in the improvement of long-term preventative care.

【 授权许可】

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